CN102348274A - Wireless communication terminal and automatic gain control method - Google Patents
Wireless communication terminal and automatic gain control method Download PDFInfo
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- CN102348274A CN102348274A CN2010102443330A CN201010244333A CN102348274A CN 102348274 A CN102348274 A CN 102348274A CN 2010102443330 A CN2010102443330 A CN 2010102443330A CN 201010244333 A CN201010244333 A CN 201010244333A CN 102348274 A CN102348274 A CN 102348274A
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Abstract
The invention provides a wireless communication terminal and an automatic gain control method. The wireless communication terminal comprises an automatic gain control unit and a mode control unit, wherein the automatic gain control unit is configured for conducting automatic gain control on receiving signals of the wireless communication terminal; and the mode control unit is configured for setting the mode of the automatic gain control unit according to the states of the wireless communication terminal, wherein the states of the wireless communication terminal include a state of failing to acquire the timing of frames and a state of successfully acquiring the timing of frames, the modes of the automatic gain control unit include a high-speed mode and a low-speed mode, the gain value regulation period of the automatic gain control unit in the high-speed mode is shorter than that in the low-speed mode, the mode control unit sets the mode of the automatic gain control unit to be the high-speed mode when the wireless communication terminal enters in the state of failing to acquire the timing of frames, and the mode control unit sets the mode of the automatic gain control unit set to be the low-speed mode when the wireless communication terminal enters in the state of successfully acquiring the timing of frames.
Description
Technical field
The application relates to radio communication, relates in particular to the automatic gain control (AGC) in time division duplex (TDD) wireless communication system.
Background technology
In the wireless communication terminal, because the fading effect (path loss, shadow fading, multipath fading etc.) of wireless channel, and the variation of business load, the amplitude of reception signal and changing significantly dynamically of power can be caused.To the signal quantization distortion that the bigger signal of this dynamic range can cause, (Automatic gain control, AGC) technology solves generally to use automatic gain control.(Analog to Digital Converter under the prerequisite of word length ADC), is adjusted into the dynamic range that is suitable for the ADC word length with the signal of great dynamic range automatically, reduces quantizing distortion not increasing analog to digital converter.Another benefit that adopts the AGC technology is to reduce to realize cost, adopts the word length of less ADC, obtains enough quantified precisions, and has reduced the implementation complexity of follow-up baseband circuit.
(Time Division Duplex, TDD) in the system, (UserEquipment UE) can receive downstream signal that comes from the base station and the upward signal that comes from neighboring user at the carrier frequency point to user terminal simultaneously at time division duplex.Because upward signal and downstream signal come from separate signal source respectively, for terminal receiver, interval reception signal statistics and the performance number of up operation interval and downlink working can differ greatly usually.Set up under the synchronous situation with the base station at UE, UE can carry out the renewal that AGC gains through only measuring downstream signal.But do not set up synchronous situation with the base station as yet for UE, UE can't distinguish the upward signal of downstream signal and contiguous UE transmission, and AGC may be applied to downstream signal with the yield value that generates according to upward signal power.When the power difference of upward signal and downstream signal is very big, can cause downstream signal by ADC peak clipping (Clipping) or the effectively minimizing of quantization bit.This will cause the damage that quantizes the back synchronizing symbol, and cause the increase of synchronization acquistion time and even can't obtain synchronous.
Summary of the invention
Provide hereinafter about brief overview of the present invention, so that the basic comprehension about some aspect of the present invention is provided.Should be appreciated that this general introduction is not about exhaustive general introduction of the present invention.It is not that intention is confirmed key of the present invention or pith, neither be intended to limit scope of the present invention.Its purpose only is to provide some notion with the form of simplifying, with this as the preorder in greater detail of argumentation after a while.
According to an aspect of the present invention, a kind of wireless communication terminal comprises: automatic gain control unit is configured to the reception signal of wireless communication terminal is carried out automatic gain control; And pattern control unit; Be configured to be provided with the pattern of automatic gain control unit according to the state of wireless communication terminal; Wherein, The state of wireless communication terminal comprises the state that does not obtain the frame timing and has obtained frame state regularly; The pattern of automatic gain control unit comprises fast mode and low-speed mode; The yield value adjustment cycle of automatic gain control unit under fast mode is less than the yield value adjustment cycle under low-speed mode, and the pattern of automatic gain control unit was set to fast mode when the pattern control unit got into the state that does not obtain the frame timing at wireless communication terminal, and the pattern of automatic gain control unit is set to low-speed mode when wireless communication terminal gets into the state that has obtained the frame timing.
According to a further aspect in the invention, a kind of auto gain control method that is used for wireless communication terminal comprises: the pattern that the automatic gain control operation is set according to the state of wireless communication terminal; And the reception signal of wireless communication terminal is carried out the automatic gain control operation according to the pattern of the automatic gain control that is provided with; Wherein, The state of wireless communication terminal comprises the state that does not obtain the frame timing and has obtained frame state regularly; The pattern of automatic gain control operation comprises fast mode and low-speed mode; The yield value adjustment cycle is less than the yield value adjustment cycle under low-speed mode under fast mode; The pattern of automatic gain control operation is set to fast mode when wireless communication terminal gets into the state that does not obtain the frame timing, and the pattern of automatic gain control operation is set to low-speed mode when wireless communication terminal gets into the state that has obtained the frame timing.
The present invention can realize the automatic gain control in the TDD radio communication system effectively.
Description of drawings
With reference to below in conjunction with the explanation of accompanying drawing, can understand above and other purpose, characteristics and advantage of the present invention to the embodiment of the invention with being more prone to.Parts in the accompanying drawing are just in order to illustrate principle of the present invention.In the accompanying drawings, identical or similar techniques characteristic or parts will adopt identical or similar Reference numeral to represent.
Fig. 1 shows the frame structure of TD-LTE system;
Fig. 2 shows the position of reference signal in the frame structure of TD-LTE system;
Fig. 3 shows the wireless communication terminal according to an embodiment of the present disclosure;
Fig. 4 shows according to the automatic gain control unit in the wireless communication terminal of an embodiment of the present disclosure;
Fig. 5 shows according to the gain maker in the wireless communication terminal of an embodiment of the present disclosure;
Fig. 6 shows a kind of implementation according to the fast mode of embodiment of the present disclosure;
Fig. 7 shows the another kind of implementation according to the fast mode of embodiment of the present disclosure;
Fig. 8 shows the operation according to automatic gain control under the previous stage of the low-speed mode of embodiment of the present disclosure;
Fig. 9 shows the operation according to automatic gain control under the latter half of the low-speed mode of embodiment of the present disclosure; And
Figure 10 shows the auto gain control method that is used for wireless communication terminal according to embodiment of the present disclosure.
Embodiment
Embodiments of the invention are described with reference to the accompanying drawings.Element of in an accompanying drawing of the present invention or a kind of execution mode, describing and characteristic can combine with element and the characteristic shown in one or more other accompanying drawing or the execution mode.Should be noted that for purpose clearly, omitted the parts that have nothing to do with the present invention, those of ordinary skills are known and the expression and the description of processing in accompanying drawing and the explanation.
Below partial content with LTE (Long Term Evolution) the TDD system (TD-LTE system) of 3GPP example as the TDD system, but should be appreciated that, the invention is not restricted to the TD-LTE system.
Fig. 1 shows the frame structure sketch map of TD-LTE system.Comprise three kinds of subframe structures in the TD-LTE system: sub-frame of uplink (subframe), descending sub frame and special subframe.Subframe # 0, #3, #4 are descending sub frame in Fig. 1, and subframe # 2 is a sub-frame of uplink, and subframe # 1 is a special subframe.In the narration, with " D " sign descending sub frame, " U " identifies sub-frame of uplink below, and " S " identifies special subframe, and the current subframe type of " X " sign is unknown.The time slot that it is 0.5ms that each subframe comprises two length (slot).Special subframe is by DwPTS, and GP and UpPTS form.Main synchronizing symbol (Primarysynchronization symbol; PSS) be positioned at the 3rd symbol of DwPTS; And auxilliary synchronizing symbol (Secondary synchronization symbol SSS) is positioned at last symbol of first subframe (SF#0), and is as shown in Figure 1.Cell searching utilizes the detection to these two synchronizing symbols to obtain frame timing and sub-district ID.
Table 1 shows several kinds of frame configurations in the TD-LTE system.
Frame configuration in the table 1TD-LTE system
Fig. 2 shows the position of reference signal in the frame structure of TD-LTE system.In Fig. 2, be labeled as R
0The position be the reference signal position of port0, the position of shade is the reference signal position of port1.Shown in figure-2, reference signal is arranged in the #0 of slot, the #4 symbol.In downstream signal, no matter have or not transfer of data, reference signal all will be sent.
Fig. 3 shows the wireless communication terminal 300 according to an embodiment of the present disclosure.
Wireless communication terminal 300 comprises pattern control unit 302 and automatic gain control unit 304.Automatic gain control unit 304 is configured to the reception signal of wireless communication terminal 300 is carried out automatic gain control.Pattern control unit 302 is configured to be provided with according to the state of wireless communication terminal 300 pattern of automatic gain control unit 304.The state of wireless communication terminal 300 comprises the state that does not obtain the frame timing and has obtained frame state regularly.The pattern of automatic gain control unit 304 comprises fast mode and low-speed mode.The yield value adjustment cycle of automatic gain control unit 304 under fast mode is less than the yield value adjustment cycle under low-speed mode.The pattern of automatic gain control unit 304 was set to fast mode when pattern control unit 302 got into the state that does not obtain the frame timing at wireless communication terminal 300, and the pattern of automatic gain control unit 304 is set to low-speed mode when wireless communication terminal 300 gets into the state that has obtained the frame timing.In one example, the yield value adjustment cycle of automatic gain control unit under fast mode is smaller or equal to a sub-frame length, and the yield value adjustment cycle under low-speed mode is greater than a sub-frame length.
For example, the wireless communication terminal in the LTE TDD system of 3GPP has the state that does not obtain the frame timing and has obtained frame state regularly.Having obtained frame state regularly can be divided into again and obtained state that frame regularly do not obtain the frame configuration and obtained frame regularly and the state that disposes of frame.For the wireless communication terminal that is in different accepting states, the purpose that its signal receives is different.Do not obtaining frame state regularly, the purpose that receives signal is the rectification of carrier wave frequency deviation between catching of frame timing and terminal and base station; Obtaining the state that frame does not regularly obtain the frame configuration, the purpose that receives signal is to obtain system control information; At the state that obtains frame timing and frame configuration, the purpose that receives signal is that data are recovered.
In the present embodiment; Difference according to accepting state; Signal receives the difference of index, and pattern control unit 302 is adjusted to different patterns with automatic gain control unit 304, has guaranteed the precision of wireless communication terminal 300 necessary quantized signal under each operating state.
Fig. 4 shows according to the automatic gain control unit in the wireless communication terminal of an embodiment of the present disclosure 400.
Automatic gain control unit 400 comprises gain maker 406, is configured to generate yield value; Variable gain amplifier 402 is configured to adjust the amplitude that receives signal and export adjusted signal according to the yield value that gain maker 406 generates; And A-D converter 404, being configured to the signal transformation from variable gain amplifier 402 outputs is digital signal.
Gain maker 406 can be through measuring the power that some time periods receive signal (through the signal behind the ADC); Compare with reference power; Generate yield value (gain) according to certain algorithm, pass to the amplitude that variable gain amplifier 402 is adjusted the analog signal that the next time period receives then.
Fig. 5 shows according to the gain maker 500 in the wireless communication terminal of an embodiment of the present disclosure.
Gain maker 500 comprises power measurement module 502, is configured to measure the power that receives signal; Power comparison module 504 is configured to the power and the target power of the reception signal of measuring are compared to confirm power adjustment; And average module 504, be configured to current power adjustment of confirming and previous power adjustment weighted average.
Below with the operation of each module of example introduction more specifically gain maker 500.
In one example, power measurement module 502 is for receiving signal r
(i), measuring N
MeasureAverage power in the individual sampling point interval.N
MeasureIndividual sampling point time corresponding length T
MeasSuitable with the symbol lengths of use Normal CP in the TDD-LTE system, 14 T
MeasLength be a sub-frame length 1ms.The average power of asking is:
K
SetFor more than or equal to 1 integer.
More than adopt average power as signal strength metric, the invention is not restricted to this, also can adopt average amplitude as signal strength metric.
Then, from K
SetIndividual recording got maximum in the power,
P
est_max＝max(P
est(0)，P
est(1)，...，P
est(K
set-1))
Alternatively, through logarithmic transformation, can get: P
DB=10log
10(P
Est_max) [dB]
More than adopt K
SetIndividually record maximum in the power, the invention is not restricted to this, also can adopt K as the power of measuring
SetThe individual mean value that records power is as the power of measuring.
Power comparison module 504, with the power of the reception signal of measuring and target power relatively with definite power adjustment.Target power can be confirmed by the maximum quantized power of A-D converter and the difference of margin value (Headroom).The maximum quantized power of A-D converter is confirmed by the word length of ADC.Suppose the word length N of ADC
Bit, margin value is P
HR[dB]
P
tar＝10log
10(2×(2
Nbit-1-1)
2)-P
HR[dB]
P wherein
HRCan be provided with according to the different mode of different automatic gain control units, also can be set by the disappear degree at peak of ADC according to signal.
Then can calculate target power and the poor Δ P that records power then
ΔP＝P
tar-P
dB[dB]
Difference power Δ P (power adjustment just) between j measurement zone can be written as:
ΔP(j)＝P
tar(j)-P
dB(j)
Averaging unit 506 can utilize following formula with current power adjustment and the preceding weighted average of adjustment amount several times:
Wherein, Suppose that
α is a forgetting factor; For the pattern of different automatic gain control units, forgetting factor 0＜=α＜=1.
Then the final gain value is updated to
Be presented in the operation of automatic gain control unit under the different mode below.
In one embodiment; When wireless communication terminal does not capture timing information (for example; Wireless communication terminal is carrying out searching carrier, search of initial zone or is returning to Active pattern (activity pattern) from sleep pattern); Pattern control unit automatic gain control unit is set to fast mode, and the measurement of yield value and adjustment cycle are very short in fast mode, for example can be less than a sub-frame length.After Cell searching is accomplished, get into the previous stage of low-speed mode, at this moment the terminal is only known frame timing information but is not known the uplink-downlink configuration information of frame, can only utilize fixing descending sub frame to carry out AGC and measure.After uplink-downlink configuration information is detected, get into the latter half of low-speed mode, can utilize all descending sub frames to carry out AGC and measure.
1. fast mode
According to the frame structure shown in the table 1, the sub-frame before the special subframe must be a descending sub frame.Through the adjustment in the DwPTS in this subframe and special subframe, yield value is converged to be suitable for the yield value of synchronizing symbol.
Fig. 6 shows a kind of implementation of fast mode according to an embodiment of the invention.In Fig. 6.T
MeasK
SetFor measuring (Measure) time, T
ApplyBe that yield value calculates, yield value feeds back to VGA, VGA adjusts according to yield value and to stablizing needed processing delay, is determined by the device level.Usually, T
ApplyThan T
MeasK
SetMuch little, even can ignore.
Initial at fast mode, for example behind starting up of terminal, earlier through measuring adjustment (warm up) for several times, with the horizontal adjustment that receives signal within the ADC working range.The number of times of adjustment can be set according to ADC dynamic range and the dynamic range that receives signal.For example, for 12bit ADC, the signal of 72dB dynamic range, in order to guarantee to converge to an available yield value from a yield value of setting at random, the starting stage is carried out 3-5 yield value adjustment.Afterwards, wireless communication terminal begins to carry out Cell searching.For the variation that guarantees that AGC can trace signals power, forgetting factor α can value be 1, that is to say, the weight of the previous power adjustment in the average module can be set to zero.In addition, try one's best not by peak clipping in order to guarantee signal, and a rational dynamic range, P are arranged
HRValue is 9-36dB, more preferably, is chosen as about 18～27dB.In order to guarantee before the PSS/SSS symbol, to have the yield value adjustment about four times, then K
SetIt is more little good more to be worth, but the setting of considering Kset not should less than be maximum time between the reference signal at interval in order to avoid the null symbol completely that measures, with reference to Fig. 2, can be with K
SetValue is 4-5.That is to say that be to receive the maximum time domain interval of the reference signal in the signal perhaps than the big symbol lengths of maximum time domain interval that receives the reference signal in the signal measuring period with power measurement module.As shown in Figure 6, each measuring period non-overlapping copies, and the yield value adjustment cycle of automatic gain control unit (G0, G1 ...) and equal the measuring period of power measurement module.In one embodiment, the yield value adjustment cycle of automatic gain control unit can be greater than the measuring period of power measurement module.
In addition, at interval GP can be at fixing P to the influence of AGC in order to prevent up-downgoing
HRThe basis on increase a margin value deviant.Thereby target power can be expressed as:
P
tar＝10log
10(2×(2
Nbit-1)
2)-P
HR-P
offset
P wherein
Offset＞=0, confirm that by the disappeared ratio at peak of signal peak P more at most disappears
OffsetBig more.For example, can utilize overflow (overflowing) the output mechanism of ADC to obtain the margin value deviant.Particularly, can add up T between corresponding fast mode measurement zone
MeasK
SetThe sampling point number of interior overflow and the ratio that gross sample is counted out.Can adopt the method for fixed gate limit value, when this ratio surpasses 10%, P
Offset=3dB; Ratio surpasses 20%, P
Offset=6dB.If ADC does not have the overflow output function, can adopt the number of samples of full scale output and the ratio of total number of samples to replace.
Fig. 7 shows the another kind of implementation of fast mode according to an embodiment of the invention.With the difference of Fig. 6 be to overlap each other each measuring period (Measure), the yield value adjustment cycle of automatic gain control unit (G0, G1 ...) and less than the measuring period of power measurement module, adjustment cycle is 1-2 T
Meas, in this Fig. 7, ignore T in addition
ApplyIn Fig. 7, the convergence rate of yield value faster than among Fig. 6.
2. low-speed mode
Fig. 8 shows the operation according to automatic gain control under the previous stage of the low-speed mode of embodiment of the present disclosure.In the previous stage of low-speed mode; When just the terminal is in and obtains frame and regularly do not obtain the state of frame configuration; AGC can carry out the measurement and the renewal of the yield value of low speed in first subframe of every field, and this stage can last till that the terminal obtains till the uplink-downlink configuration information.In this stage, continue to follow the tracks of synchronously and the system configuration detecting unit, carry out PBCH, PCFICH, PDCCH detects, and in the SIB of PDSCH (systeminformation block), obtains the uplink-downlink configuration information of TD-LTE frame structure.
In the previous stage of low-speed mode, it is to get into next stage that the uplink-downlink configuration that whether obtains frame according to the terminal decides.In the previous stage of low-speed mode, only measure downstream signal, the variation of signal power mainly receives to decline soon to be influenced, and can not change too violent.Owing to might do some and detect the relevant work of measuring in the previous stage of low-speed mode; In order to guarantee the stability of yield value; Then forgetting factor α value is 0.1～0.5; That is to say that the weight of the previous power adjustment in the average module is 1～9 with the ratio of the weight of current power adjustment.K
SetBe 14, just be a sub-frame measuring period of power measurement module, P
HRValue is 9-36dB, more preferably is about 18～27dB.
Fig. 9 has provided the latter half operation of control automatically down according to the low-speed mode of embodiment of the present disclosure.After the uplink-downlink configuration that obtains frame, get into the latter half of low-speed mode.In the latter half of low-speed mode, the AGC unit only utilizes descending sub frame to carry out the AGC renewal.For special subframe, employing keeps (hold) operation, does not promptly carry out yield value measurement and renewal this moment.Run into sub-frame of uplink, store current AGC yield value, during sub-frame of uplink, do not carry out any operation (stop),, recover (restore) AGC storing value before and be used for the signal reception when running into descending sub frame once more.To different uplink-downlink configuration, the renewal of yield value and the also corresponding adjustment of measurement flow process.In the latter half of low-speed mode, in order to guarantee the stability of yield value, then forgetting factor α value is 0.1～0.5, that is to say, the weight of the previous power adjustment in the average module is 1～9 with the ratio of the weight of current power adjustment.K
SetBe 14, just be a sub-frame measuring period of power measurement module, P
HRValue is 9-36dB, more preferably is about 18～27dB.
In one embodiment, before the previous stage of low-speed mode, can also there be a transition stage.Exist the purpose of transition stage to be,, thereby increase this stage and make yield value further convergence is stable because the gain of the desirable corresponding downstream signal of the yield value that fast mode is obtained down distance possibly also have distance.
In one example; The region of search corresponding to successful Cell searching; With all carry out the yield value that AGC upgrades and store (detecting the successfully AGC yield value in interval comprising corresponding SSS) in this interval; In the previous stage of follow-up low-speed mode, the AGC that uses corresponding SSS successfully to detect gains as the initial value of AGC under this pattern.
In another example,, the yield value that last AGC in this interval upgrades is stored corresponding to the region of search of successful Cell searching.In in the previous stage of follow-up low-speed mode as the initial value of AGC.After obtaining synchronization timing, utilize known fixedly descending sub frame 0 and 5, carry out the measurement and the renewal of yield value at a high speed, this stage can continue 1-2 field.Simultaneously, follow the tracks of synchronously, improve synchronization accuracy through timing and frequency-tracking.Wherein, the lasting time of transition state is 5～10ms (adjusting through 1-2 field makes yield value converge to the corresponding yield value of downstream signal).For transition state, forgetting factor α value is 1, K
SetBe 4-5, P
HRValue is 9-36dB, is preferably about 18～27dB.After fixing descending sub frame, keep (hold) last AGC yield value.Can find out, in this transition stage, at fixing descending sub frame, adopt with fast mode under identical running parameter carry out automatic gain and control.
In one embodiment, the running parameter of automatic gain control unit under each pattern, forgetting factor α for example, K
Set, P
HRDeng being provided with by the pattern control unit.In another embodiment, the pattern control unit only is provided with the pattern of automatic gain control unit and/or the stage in the pattern, and the parameter under each mode of operation can be arranged in the automatic gain control unit in advance.
Figure 10 shows the auto gain control method that is used for wireless communication terminal according to embodiment of the present disclosure.
In step 1002, the pattern of automatic gain control operation is set according to the state of wireless communication terminal.In step 1004, the reception signal of wireless communication terminal is carried out the automatic gain control operation according to the pattern of the automatic gain control that is provided with.The state of wireless communication terminal comprises the state that does not obtain the frame timing and has obtained frame state regularly; The pattern of automatic gain control operation comprises fast mode and low-speed mode; The yield value adjustment cycle is less than the yield value adjustment cycle under low-speed mode under fast mode; The pattern of automatic gain control operation is set to fast mode when wireless communication terminal gets into the state that does not obtain the frame timing, and the pattern of automatic gain control operation is set to low-speed mode when wireless communication terminal gets into the state that has obtained the frame timing.
In one example, the yield value adjustment cycle of automatic gain control operation under fast mode is smaller or equal to a sub-frame length, and the yield value adjustment cycle under the low-speed mode is greater than a sub-frame length.
In one example, obtained frame state regularly and comprised that obtaining frame does not regularly obtain the state of frame configuration and obtained the frame timing and the state of frame configuration.
In one example, the automatic gain control operation comprises: generate yield value; Adjust the amplitude that receives signal according to yield value; And adjusted signal carried out analog to digital conversion to be transformed to digital signal.In one example, generating yield value comprises: measure the power that receives signal; The power and the target power of the reception signal of measuring are compared to confirm power adjustment; And the current power adjustment that will confirm and previous power adjustment weighted average.
In one example, when the automatic gain control operation was fast mode, the weight of previous power adjustment was set to zero.
In one example, what target power can be for maximum power and margin value is poor, and when the automatic gain control operation was fast mode, margin value was set to 9～36dB, more preferably 18～27dB.
In one example; Target power is that maximum quantized power deducts margin value and margin value deviant sum; The margin value deviant increases along with the increase of the ratio of the signal at the peak that in analog to digital conversion, disappeared; When the automatic gain control operation was fast mode, margin value was set to 9～36dB, more preferably 18～27dB.
In one example; When the automatic gain control operation is fast mode; The maximum time domain interval that is set to receive the reference signal in the signal measuring period in the power of measurement reception signal is perhaps than the big symbol lengths of maximum time domain interval that receives the reference signal in the signal; Each measuring period non-overlapping copies, the yield value adjustment cycle of automatic gain control operation is more than or equal to stating measuring period.
In one example; When the automatic gain control operation is fast mode; The maximum time domain interval that is set to receive the reference signal in the signal measuring period in the power of measurement reception signal is perhaps than the big symbol lengths of maximum time domain interval that receives the reference in the signal; Overlap each other each measuring period, and the yield value adjustment cycle of automatic gain control operation is less than measuring period.
In one example, when the automatic gain control operation is low-speed mode and wireless communication terminal be in when obtaining frame and regularly not obtaining the state of frame configuration, the automatic gain control operation only regenerates yield value in first subframe of each field.
In one example, when the automatic gain control operation is low-speed mode and wireless communication terminal be in when obtaining frame regularly with the state of frame configuration, the automatic gain control operation regenerates yield value at descending sub frame.
In one example, when the automatic gain control operation was low-speed mode, the weight of previous power adjustment was 1～9 with the ratio of the weight of current power adjustment.
In one example, target power is the poor of maximum quantized power and margin value, and when the automatic gain control operation was low-speed mode, margin value was set to 9～36dB, more preferably is 18～27dB.
In one example, when the automatic gain control operation is low-speed mode, be set to a sub-frame measuring period in the power of measurement reception signal.
In one example; When the automatic gain control operation is low-speed mode and wireless communication terminal be in when obtaining frame and regularly not obtaining the state of frame configuration; The automatic gain control operation is in the transition stage of low-speed mode earlier; In this transition stage, at fixing descending sub frame, adopt with fast mode under identical running parameter carry out automatic gain and control.
Detail about the operation among Figure 10 can repeat no more with reference to the description that combines Fig. 3-Fig. 9 to wireless communication terminal here.
Above for description according to the wireless communication terminal of embodiment of the present disclosure in; Searching carrier, Cell searching, follow the tracks of synchronously and operation such as system configuration detection and the corresponding parts of accomplishing these operations are that those skilled in the art can realize, be not described in detail here.
In an embodiment of the present invention, wireless communication terminal can be a mobile phone, pocket computer, PDA, data card, USB rod, vehicle-mounted receiver, intelligent appliance, the electronic equipment of any every loading LTE chip such as intelligence instrument.
Above execution modes more of the present invention have been carried out detailed description.Accessible like those of ordinary skill in the art institute; Whole or any step or the parts of method and apparatus of the present invention; Can be in the network of any computing equipment (comprising processor, storage medium etc.) or computing equipment; Realize that with hardware, firmware, software or their combination this is that those of ordinary skills' their basic programming skill of utilization under the situation of understanding content of the present invention just can be realized, does not therefore need to specify at this.
In addition, it is obvious that, when relating to possible peripheral operation in the superincumbent explanation, will use any display device and any input equipment, corresponding interface and the control program that link to each other with any computing equipment undoubtedly.Generally speaking; The hardware of the various operations in the related hardware in computer, computer system or the computer network, software and the realization preceding method of the present invention, firmware, software or their combination promptly constitute equipment of the present invention and each building block thereof.
Therefore, based on above-mentioned understanding, the object of the invention can also be realized through program of operation or batch processing on any messaging device.Said messaging device can be known common apparatus.Therefore, the object of the invention also can be only through providing the program product that comprises the program code of realizing said method or equipment to realize.That is to say that such program product also constitutes the present invention, and storage or the medium that transmits such program product also constitute the present invention.Obviously, said storage or transmission medium can be well known by persons skilled in the art, and therefore the storage or the transmission medium of any kind that is perhaps developed in the future also there is no need at this various storages or transmission medium to be enumerated one by one.
In equipment of the present invention and method, obviously, after can decomposing, make up and/or decompose, each parts or each step reconfigure.These decomposition and/or reconfigure and to be regarded as equivalents of the present invention.The step that also it is pointed out that the above-mentioned series of processes of execution can order following the instructions naturally be carried out in chronological order, but does not need necessarily to carry out according to time sequencing.Some step can walk abreast or carry out independently of one another.Simultaneously; In the above in the description to the specific embodiment of the invention; Characteristic to a kind of execution mode is described and/or illustrated can be used in one or more other execution mode with identical or similar mode; Combined with the characteristic in other execution mode, or substitute the characteristic in other execution mode.
Should stress that term " comprises/comprise " existence that when this paper uses, refers to characteristic, key element, step or assembly, but not get rid of the existence of one or more further feature, key element, step or assembly or additional.
Though specified the present invention and advantage thereof, be to be understood that and under not exceeding, can carry out various changes, alternative and conversion the situation of the appended the spirit and scope of the present invention that claim limited.And the application's scope is not limited only to the specific embodiment of the described process of specification, equipment, means, method and step.The one of ordinary skilled in the art will readily appreciate that from disclosure of the present invention, can use according to the present invention and carry out and process, equipment, means, method or step said essentially identical function of corresponding embodiment or acquisition result essentially identical with it, existing and that will be developed in the future.Therefore, appended claim is intended in their scope, comprise such process, equipment, means, method or step.
About comprising the execution mode of above each embodiment, the remarks below also disclosing.
Remarks
1. wireless communication terminal comprises:
Automatic gain control unit is configured to the reception signal of said wireless communication terminal is carried out automatic gain control; And
The pattern control unit is configured to be provided with according to the state of said wireless communication terminal the pattern of automatic gain control unit,
Wherein, The state of said wireless communication terminal comprises the state that does not obtain the frame timing and has obtained frame state regularly; The pattern of said automatic gain control unit comprises fast mode and low-speed mode; The yield value adjustment cycle of said automatic gain control unit under fast mode is less than the yield value adjustment cycle under low-speed mode; The pattern of said automatic gain control unit was set to fast mode when said pattern control unit got into the state that does not obtain the frame timing at said wireless communication terminal, and the pattern of said automatic gain control unit is set to low-speed mode when said wireless communication terminal gets into the state that has obtained the frame timing.
2. like remarks 1 described wireless communication terminal, the yield value adjustment cycle of wherein said automatic gain control unit under fast mode is smaller or equal to a sub-frame length, and the yield value adjustment cycle under low-speed mode is greater than a sub-frame length.
3. like remarks 1 described wireless communication terminal, the wherein said frame state regularly that obtained comprises that obtaining frame does not regularly obtain the state of frame configuration and obtained the frame timing and the state of frame configuration.
4. like remarks 3 described wireless communication terminals, wherein said automatic gain control unit comprises:
The gain maker is configured to generate yield value;
Variable gain amplifier is configured to adjust the amplitude that receives signal and export adjusted signal according to the yield value that said gain maker generates; And
A-D converter, being configured to the signal transformation from said variable gain amplifier output is digital signal,
Wherein said gain maker comprises:
Power measurement module is configured to measure the power that receives signal;
The power comparison module is configured to the power and the target power of the reception signal of measuring are compared to confirm power adjustment; And
Average module is configured to current power adjustment of confirming and previous power adjustment weighted average.
5. like remarks 4 described wireless communication terminals, wherein when said automatic gain control unit was in fast mode, the weight of the previous power adjustment in the said average module was set to zero.
6. like remarks 4 described wireless communication terminals, wherein said target power is maximum quantized power and margin value poor of said A-D converter, and when said automatic gain control unit was in fast mode, said margin value was set to 9～36dB.
7. like remarks 4 described wireless communication terminals; Wherein said target power is that the maximum quantized power of said A-D converter deducts margin value and margin value deviant sum; Said margin value deviant increases along with the increase of the ratio of the signal at the peak that in said A-D converter, disappeared; When said automatic gain control unit was in fast mode, said margin value was set to 9～36dB.
8. like remarks 6 or 7 described wireless communication terminals, wherein when said automatic gain control unit was in fast mode, said margin value was set to 18～27dB.
9. like remarks 4 described wireless communication terminals; Wherein when said automatic gain control unit is in fast mode; The maximum time domain interval that is set to receive the reference signal in the signal measuring period of said power measurement module is perhaps than the big symbol lengths of maximum time domain interval that receives the reference signal in the signal; Each measuring period non-overlapping copies, the yield value adjustment cycle of said automatic gain control unit is more than or equal to the measuring period of said power measurement module.
10. like remarks 4 described wireless communication terminals; Wherein when said automatic gain control unit is in fast mode; The largest interval that is set to receive the reference signal in the signal measuring period of said power measurement module is perhaps than the big symbol lengths of largest interval that receives the reference signal in the signal; Overlap each other each measuring period, and the yield value adjustment cycle of said automatic gain control unit is less than the measuring period of said power measurement module.
11. like remarks 4 described wireless communication terminals; Wherein when said automatic gain control unit is in low-speed mode and said wireless communication terminal be in when obtaining frame and regularly not obtaining the state of frame configuration, said automatic gain control unit only regenerates yield value in first subframe of each field.
12. like remarks 4 described wireless communication terminals; Wherein when said automatic gain control unit is in low-speed mode and said wireless communication terminal be in when obtaining frame regularly with the state of frame configuration, said automatic gain control unit regenerates yield value at descending sub frame.
13. like remarks 11 or 12 described wireless communication terminals, wherein when said automatic gain control unit was in low-speed mode, the weight of the previous power adjustment in the said average module was 1～9 with the ratio of the weight of current power adjustment.
14. like remarks 11 or 12 described wireless communication terminals, wherein said target power is maximum quantized power and margin value poor of said A-D converter, when said automatic gain control unit was in low-speed mode, said margin value was set to 9～36dB.
15. like remarks 14 described wireless communication terminals, when said automatic gain control unit was in low-speed mode, said margin value was set to 18～27dB.
16., wherein when said automatic gain control unit is in low-speed mode, be set to a sub-frame measuring period of said power measurement module like remarks 11 or 12 described wireless communication terminals.
17. like remarks 11 described wireless communication terminals; Wherein when said automatic gain control unit is in low-speed mode and said wireless communication terminal be in when obtaining frame and regularly not obtaining the state of frame configuration; Said automatic gain control unit is in the transition stage of low-speed mode earlier; In this transition stage, at fixing descending sub frame, adopt with fast mode under identical running parameter carry out automatic gain and control.
18. an auto gain control method that is used for wireless communication terminal comprises:
The pattern of automatic gain control operation is set according to the state of said wireless communication terminal; And
According to the pattern of the automatic gain control that is provided with the reception signal of said wireless communication terminal is carried out the automatic gain control operation;
Wherein, The state of said wireless communication terminal comprises the state that does not obtain the frame timing and has obtained frame state regularly; The pattern of said automatic gain control operation comprises fast mode and low-speed mode; The yield value adjustment cycle is less than the yield value adjustment cycle under low-speed mode under fast mode; The pattern of said automatic gain control operation is set to fast mode when said wireless communication terminal gets into the state that does not obtain the frame timing, and the pattern of said automatic gain control operation is set to low-speed mode when said wireless communication terminal gets into the state that has obtained the frame timing.
19. like remarks 18 described methods, the yield value adjustment cycle of wherein said automatic gain control operation under fast mode is smaller or equal to a sub-frame length, and the yield value adjustment cycle under low-speed mode is greater than a sub-frame length.
20. like remarks 18 described methods, the wherein said frame state regularly that obtained comprises that obtaining frame does not regularly obtain the state of frame configuration and obtained the frame timing and the state of frame configuration.
Claims (10)
1. wireless communication terminal comprises:
Automatic gain control unit is configured to the reception signal of said wireless communication terminal is carried out automatic gain control; And
The pattern control unit is configured to be provided with according to the state of said wireless communication terminal the pattern of automatic gain control unit,
Wherein, The state of said wireless communication terminal comprises the state that does not obtain the frame timing and has obtained frame state regularly; The pattern of said automatic gain control unit comprises fast mode and low-speed mode; The yield value adjustment cycle of said automatic gain control unit under fast mode is less than the yield value adjustment cycle under low-speed mode; The pattern of said automatic gain control unit was set to fast mode when said pattern control unit got into the state that does not obtain the frame timing at said wireless communication terminal, and the pattern of said automatic gain control unit is set to low-speed mode when said wireless communication terminal gets into the state that has obtained the frame timing.
2. wireless communication terminal as claimed in claim 1, the wherein said automatic gain control unit yield value adjustment cycle under fast mode is smaller or equal to a sub-frame length, and the yield value adjustment cycle under low-speed mode is greater than a sub-frame length.
3. wireless communication terminal as claimed in claim 1, the wherein said frame state regularly that obtained comprises that obtaining frame does not regularly obtain the state of frame configuration and obtained the frame timing and the state of frame configuration.
4. wireless communication terminal as claimed in claim 3, wherein said automatic gain control unit comprises:
The gain maker is configured to generate yield value;
Variable gain amplifier is configured to adjust the amplitude that receives signal and export adjusted signal according to the yield value that said gain maker generates; And
A-D converter, being configured to the signal transformation from said variable gain amplifier output is digital signal,
Wherein said gain maker comprises:
Power measurement module is configured to measure the power that receives signal;
The power comparison module is configured to the power and the target power of the reception signal of measuring are compared to confirm power adjustment; And
Average module is configured to current power adjustment of confirming and previous power adjustment weighted average.
5. wireless communication terminal as claimed in claim 4, wherein when said automatic gain control unit was in fast mode, the weight of the previous power adjustment in the said average module was set to zero.
6. wireless communication terminal as claimed in claim 4; Wherein when said automatic gain control unit is in low-speed mode and said wireless communication terminal be in when obtaining frame and regularly not obtaining the state of frame configuration, said automatic gain control unit only regenerates yield value in first subframe of each field.
7. wireless communication terminal as claimed in claim 4; Wherein when said automatic gain control unit is in low-speed mode and said wireless communication terminal be in when obtaining frame regularly with the state of frame configuration, said automatic gain control unit regenerates yield value at descending sub frame.
8. like claim 6 or 7 described wireless communication terminals, wherein when said automatic gain control unit was in low-speed mode, the weight of the previous power adjustment in the said average module was 1～9 with the ratio of the weight of current power adjustment.
9. like claim 6 or 7 described wireless communication terminals, wherein when said automatic gain control unit is in low-speed mode, be set to a sub-frame measuring period of said power measurement module.
10. wireless communication terminal as claimed in claim 6; Wherein when said automatic gain control unit is in low-speed mode and said wireless communication terminal be in when obtaining frame and regularly not obtaining the state of frame configuration; Said automatic gain control unit is in the transition stage of low-speed mode earlier; In this transition stage, at fixing descending sub frame, adopt with fast mode under identical running parameter carry out automatic gain and control.
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| CN201010244333.0A CN102348274B (en) | 2010-07-30 | 2010-07-30 | Wireless communication terminal |
| JP2011167115A JP5765120B2 (en) | 2010-07-30 | 2011-07-29 | Wireless communication terminal and automatic gain control method |
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| CN201010244333.0A CN102348274B (en) | 2010-07-30 | 2010-07-30 | Wireless communication terminal |
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| CN105657786A (en) * | 2016-01-20 | 2016-06-08 | 华为技术有限公司 | User equipment and gain adjustment method for low noise amplifier |
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| CN111884665A (en) * | 2020-09-28 | 2020-11-03 | 中国人民解放军国防科技大学 | Digital receiver automatic gain control method based on maximum entropy |
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| CN102347925B (en) * | 2010-07-30 | 2015-03-11 | 富士通株式会社 | Synchronization symbol detection method and apparatus thereof |
| CN103379607B (en) * | 2012-04-17 | 2018-01-30 | 中兴通讯股份有限公司 | The gain control method and device of TD HSPA+ terminal devices |
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Also Published As
| Publication number | Publication date |
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| JP2012034369A (en) | 2012-02-16 |
| CN102348274B (en) | 2014-07-23 |
| JP5765120B2 (en) | 2015-08-19 |
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