WO2001015365A1 - Dispositif de communication ofdm - Google Patents
Dispositif de communication ofdm Download PDFInfo
- Publication number
- WO2001015365A1 WO2001015365A1 PCT/JP2000/004969 JP0004969W WO0115365A1 WO 2001015365 A1 WO2001015365 A1 WO 2001015365A1 JP 0004969 W JP0004969 W JP 0004969W WO 0115365 A1 WO0115365 A1 WO 0115365A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- processing
- signal
- ofdm
- leave
- transmission
- Prior art date
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Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
- H04L27/2601—Multicarrier modulation systems
- H04L27/2602—Signal structure
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/004—Arrangements for detecting or preventing errors in the information received by using forward error control
- H04L1/0056—Systems characterized by the type of code used
- H04L1/0071—Use of interleaving
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
- H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
- H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
- H04L1/1812—Hybrid protocols; Hybrid automatic repeat request [HARQ]
- H04L1/1819—Hybrid protocols; Hybrid automatic repeat request [HARQ] with retransmission of additional or different redundancy
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
- H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
- H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
- H04L1/1867—Arrangements specially adapted for the transmitter end
- H04L1/1893—Physical mapping arrangements
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/02—Arrangements for detecting or preventing errors in the information received by diversity reception
- H04L1/04—Arrangements for detecting or preventing errors in the information received by diversity reception using frequency diversity
Definitions
- the present invention relates to an Orthogonal Frequency Division Multiplexing (OFD) communication device that performs retransmission control, and more particularly to an OFDM communication device that uses an in-leave technique.
- OFD Orthogonal Frequency Division Multiplexing
- FIG. 1 is a block diagram showing a configuration of a conventional OFDM communication device using an in-leave technology.
- the following describes the retransmission control of a conventional OFDM communication device using in-leave technology, where the first communication device and the second communication device both equipped with the OFDM communication device shown in Fig. 1 perform wireless communication. Will be described as an example. Note that, here, when the first communication device transmits a signal to the second communication device, and the second communication device receives an error in the signal, the first communication device transmits the erroneous signal to the second communication device. The case of retransmission (retransmission) to two communication devices will be described.
- a transmission signal is stored in retransmission control section 11.
- This transmission signal is a signal in packet units.
- the stored transmission signal is transmitted to the in-leave processing unit 12 by the retransmission control unit 11 according to the transmission timing.
- the order of the signals transmitted from the retransmission controller 11 is rearranged according to a specific rule.
- the rearranged signals are subjected to predetermined transmission OFDM processing by transmission OFDM section 13 and are arranged in each subcarrier.
- the signal subjected to the predetermined transmission OFDM processing is a signal allocated to each subcarrier at a predetermined subcarrier interval as a result of the interleaving processing performed by the interleave processing unit 12. I have. That is, in the signal subjected to the predetermined transmission OFDM processing, the first to third signals in the transmission signal input to the in-leave processing unit 12 are subcarrier 1, subcarrier 5, and subcarrier 9 respectively. For example, they are arranged at an interval of 4 subcarriers.
- the signal subjected to the transmission OFDM processing is transmitted to the second communication device via the antenna 14.
- the signal transmitted from the first communication device is received by the second communication device via the transmission path.
- a signal received from the antenna 14 is subjected to predetermined reception OFDM processing by the reception OFDM section 15.
- the signal on which the predetermined reception OFDM processing has been performed is subjected to the dingle processing by the ding-leave processing unit 16.
- the error-corrected signal is subjected to error correction by the error correction unit 17 for the signal subjected to the ding-leave processing.
- the error-corrected signal is output to retransmission control section 11.
- this signal is output as a received signal. Conversely, if there is an error in the error-corrected signal, this signal is stored in a predetermined memory. Then, after a signal including a packet requesting retransmission of this signal is processed by interleave processing section 12 and transmission OFDM section 13, the signal is transmitted to first communication apparatus via antenna 14. Is done.
- the retransmission control unit 11 transmits the packet requested to be retransmitted by the second communication device to the in-leave processing unit 12 according to the retransmission timing.
- This packet is subjected to the same processing as described above, and is retransmitted to the second communication device via the antenna 14.
- the error signal in the second communication device is transmitted to the first communication device. Retransmitted by the transmitting device.
- the conventional OFDM communication device using the interleave technology has the following problems. That is, a situation may occur in which a signal in which poor quality signals are concentrated at a specific time is input as a signal for performing error correction processing in the second communication device.
- FIG. 2 is referred to in order to specifically explain this situation.
- FIG. 2 is a schematic diagram showing an example of an arrangement of subcarriers in a signal received by a conventional ⁇ FDM device using an in-leave technique. It is assumed that the interleave processing unit 12 in the first communication device has performed the interleave processing as shown in the above example.
- the signals output by the din / leave processing unit 16 include subcarrier 1, subcarrier 5, and subcarrier 5.
- 9, subcarriers 13, 3, ... are signals extracted in time series from each subcarrier at an interval of 4 subcarriers.
- the signals allocated to subcarrier 1, subcarrier 5, subcarrier 9, subcarrier 13,... Have poor quality.
- the signal input to the error correction unit 17 is a signal in which poor quality signals are concentrated at a specific time, so that the effect of the error correction by the error correction unit 17 is reduced, and the presence of an error is reduced.
- the first communication device retransmits the same packet. Further, if the fluctuation of the line (transmission path) state is slower than the time interval for transmitting the same bucket by the first communication device as shown in FIG. 3, for example, the same bucket is transmitted first.
- the line condition when the same bucket is retransmitted (retransmitted) is almost the same as the line condition when the same bucket is retransmitted.
- the present inventor has proposed that the subcarrier in which each signal in the transmission signal subjected to the OFDM transmission processing is arranged changes according to the interleaving processing performed before the FDM transmission processing. Accordingly, on the receiving side, the present invention has been achieved by focusing on the fact that the quality of each signal extracted by the OFDM reception processing changes.
- An object of the present invention is to provide an OFDM communication device capable of reducing the probability that the same bucket will be mistaken continuously. This object is achieved by performing interleaving processing on the transmission signal according to the number of retransmissions of the transmission signal.
- FIG. 1 is a block diagram showing a configuration of a conventional ⁇ FDM communication device using an in-leave technology
- Figure 2 is a schematic diagram showing an example of the arrangement of subcarriers in a signal received by an OFDM device using interleaving technology
- FIG. 3 is a schematic diagram showing a state of a line used by a conventional ⁇ FDM communication device using an interleave technology
- FIG. 4 is a block diagram showing a configuration of the FDM communication apparatus according to the embodiment of the present invention.
- FIG. 4 is a block diagram showing a configuration of the OFDM communication apparatus according to the embodiment of the present invention.
- the OFDM communication apparatus according to the present embodiment will be described by taking as an example a case where a first communication apparatus and a second communication apparatus having both the OFDM communication apparatus perform wireless communication.
- the first communication device transmits a signal to the second communication device, and the signal received by the second communication device has an error, the first communication device transmits the erroneous signal.
- retransmission retransmission
- a transmission signal is stored in retransmission control section 101.
- This transmission signal is, for example, a signal in packet units.
- the stored transmission signal is transmitted to first interleave processing section 102 and second interleave processing section 103 by retransmission control section 101 in accordance with a preset transmission timing.
- First in-leave processing section 102 performs in-leave processing on the signal transmitted by retransmission control section 101. That is, the order of signals transmitted by retransmission control section 101 is rearranged according to a specific rule. The signals whose order has been rearranged by the first in-leave processor 102 are connected to the selector 10.
- the second in-leave processing unit 103 performs in-leave processing on the signal transmitted by the retransmission control unit 101. That is, the order of signals transmitted by retransmission control section 101 is rearranged according to a specific rule. However, the specific rules used by the second interleave processing unit 103 are different from the specific rules used by the first interleave processing unit 102 described above.
- the signals rearranged in order by the second interleave processing unit 103 are Output to selector 104.
- the first interleave processing unit 102 and the second interleave processing unit 103 it is possible to use various interleaves including chip-in interleave and symbol interleave.
- the signal after the interleave processing output by either the first interleave processing section 102 or the second interleave processing section 103 is output to the transmission OFDM section 105 in accordance with the control by the retransmission control section 101.
- the packet transmitted by retransmission control section 101 is a signal transmitted for the first time or a signal transmitted retransmitted. In this case, either the signal after the interleave processing from the first interleave processing section 102 or the signal after the interleave processing from the second interleave processing section 103 is transmitted. Is output from the retransmission control unit 101 to the selector 104.
- selector 104 transmits to transmission OFDM section 105 first transmission signal
- the signal after the interleave processing is output from the processing unit 102, and if the signal is a retransmitted signal, the signal after the in-leave processing from the second in-leave processing unit 103 is output. Shall be assumed.
- a signal from selector 104 that is, a signal subjected to in-leave processing by first interleave processing section 102 is subjected to predetermined transmission OFDM processing by transmission OFDM section 105, and is allocated to each subcarrier.
- This transmission OFDM processing includes processing such as serial-parallel conversion, first-order modulation ( ⁇ 3? 51 ⁇ (16 (3/8 ⁇ 1 etc.)) and IFFT (inverse Fourier transform).
- the signal subjected to the predetermined transmission OFDM processing is a predetermined subcarrier as a result of the interleaving processing performed by the first in-leave processing section 102.
- the signals are allocated to each subcarrier at intervals. That is, the signals subjected to the predetermined transmission OFDM processing are the first to fourth signals of the signal input to the first interleave processing unit 102, which are the subcarrier 1, the subcarrier 5, and the subcarrier 5, respectively.
- carriers 9 are arranged at an interval of 4 subcarriers.
- the signal subjected to the transmission OFDM processing is transmitted to the second communication device via antenna 106.
- the signal transmitted from the first communication device is received by the second communication device via the transmission path.
- a signal received by antenna 106 is subjected to predetermined reception OFDM processing by reception OFDM section 107.
- the reception OFDM processing includes processing such as synchronization, FFT (Fourier transform), transmission diversity, synchronous detection (or delay detection), and parallel-serial conversion.
- the signal on which the predetermined reception OFDM processing has been performed is output to first dinning and leaving processing section 108 and second dinning and leaving processing section 109.
- first dinning and leave processing section 108 the order of signals from reception OFDM section 107 is rearranged according to a specific rule.
- This specific rule corresponds to the specific rule used by first interleave processing section 102 in the first communication device.
- the order of the signals from reception OFDM section 107 is rearranged so as to be the same as the order when the signals were transmitted by retransmission control section 101 in the first communication device.
- the signal that has been subjected to the dinning and leave processing by the first dinning and leave processing unit 108 is output to the selector 110.
- second dinning and reeve processing section 109 the order of signals from reception OFDM section 107 is rearranged according to a specific rule.
- This specific rule corresponds to the specific rule used by second interleave processing section 103 in the first communication device.
- the order of the signal from reception OFDM section 107 is as follows: this signal is transmitted by retransmission control section 101 in the first communication apparatus. Are rearranged in the same order.
- the signal subjected to the diving process by the second dint re-processing unit 109 is output to the selector 110.
- the selector 110 After the din / leave processing output from either the first din / leave processing section 108 or the second din / leave processing section 109, in accordance with the control by the retransmission control section 101. Is output to the error correction section 111.
- the packet received via the antenna 106 is transmitted for the first time by the first communication device.
- a control signal indicating that any of the signals after the leave processing should be output to the error correction unit 111 is output from the retransmission control unit 101 to the selector 110.
- the error correction unit 1 In response to 1, the signal after the din / leave processing from the first din / leave processing unit 108 is output, and if the signal is a retransmitted signal, the second din / leave processing unit 1 It is assumed that the signal after the dinning leave process from 09 is output.
- the signal from the selector 110 that is, the signal subjected to the din / leave processing by the first din / leave processing unit 108 is subjected to error correction processing by the error correction unit 111 and subjected to retransmission control as a signal in packet units. Output to the unit 101. If there is no error in the error-corrected packet-based signal in retransmission control section 101, this signal is output as a received signal. Conversely, if there is an error in the error-corrected bucket-unit signal, this bucket-unit signal is stored in a predetermined memory. After this, retransmission of this packet unit signal Is processed by each unit of the transmission system, and then transmitted to the first communication device via the antenna 106.
- the retransmission control unit 101 retransmits the signal in packet units requested to be retransmitted by the second communication device. According to the timing, it is transmitted to first in-night leave processing section 102 and second in-night leave processing section 103. Further, retransmission control section 101 transmits to selector 104 a control signal indicating that the interleaved signal from second interleave processing section 103 should be output to transmission OFDM section 105. Is output.
- the signal after the interleave processing from the second interleave processing unit 103 is output to the transmission OFDM unit 105 in accordance with the control signal. That is, the retransmitted signal in packet units is subjected to an in-leave process different from that at the time of first transmission, and is output to transmission OFDM section 105.
- the signal from the selector 104 is subjected to the above-described processing by the transmission OFDM section 105 and transmitted to the second communication device via the antenna 106.
- the signal after transmission OFDM processing of the packet to be retransmitted is obtained by performing interleaving processing in the second interleave processing unit 103 and as a result, at a different subcarrier interval from that at the time of the first transmission,
- the signal is allocated to the subcarrier. That is, the signals after the transmission OFDM processing are the first to fourth signals in the signal input to the second in-leave processing unit 103, which are subcarrier 1, subcarrier 3, and subcarrier 3, respectively.
- subcarrier 5 and subcarrier 7 are arranged at an interval of two subcarriers. As a result, each signal in the retransmitted packet is placed in a different subcarrier from that at the time of the first transmission.
- a signal including the retransmitted packet is received via antenna 106.
- the signal received via the antenna 106 is divided into the reception 0 FDM section 107, the first
- the same processing as described above is performed by each of the buffer processing sections 109.
- the selector 110 receives a control signal from the retransmission control unit 101 indicating that the signal after the din / leave processing from the second din / leave processing unit 109 should be output to the error correction unit 111. Is output.
- the signal after the din / leave processing from the second din / leave processing section 109 is output to the error correction section 111 in accordance with the control signal. That is, the retransmitted signal in packet units is subjected to different din / leave processing from that when it was first transmitted, and is output to error correction section 111.
- the signal from the selector 110 is subjected to error correction processing by the error correction unit 111, and is output to the retransmission control unit 101.
- the signals output from the receiving OFDM unit 107 are subcarrier 1, subcarrier 5, subcarrier 9, subcarriers 13, 3, ... are signals extracted in time series from each subcarrier at an interval of 4 subcarriers.
- the signal extracted in this manner takes a certain time due to the poor quality of the signals allocated to subcarrier 1, subcarrier 5, subcarrier 9, subcarrier 13, and so on. The error is concentrated on the signal.
- the signals output by the reception OFDM unit 107 include subcarrier 1, subcarrier 3, subcarrier 5, subcarrier 7, In this way, the signals are extracted in time series from each subcarrier at an interval of two subcarriers.
- the above specific packet is first received by the second communication device. It is assumed that the state of the line at the time of receiving and the state of the line at the time of receiving again are almost the same.
- the signal extracted in this way is a signal that contains alternately low-quality and high-quality signals, so errors may concentrate at a specific time. Is a low signal. That is, in the first communication device, each signal in a specific packet is transmitted after being placed on a different subcarrier when the specific packet is transmitted first and when the specific packet is transmitted again. Therefore, the quality of each signal in the specific bucket received by the second communication device is different from each other in each of the above cases.
- the state of the line in each of the above cases is substantially the same, in the specific bucket received by the second communication device, the possibility that errors concentrate at a specific time is reduced.
- the second communication device retransmits the packet by the first communication device. Packets are much less likely to make errors. That is, in the above case, it is possible to avoid a situation where a specific packet is continuously erroneous.
- the present invention when the first communication device transmits a signal to the second communication device, and the signal received by the second communication device has an error, When the first communication device retransmits (retransmits) to the second communication device
- the present invention provides that the second communication device transmits a signal to the first communication device, When an error is present in a signal received by one communication device, the erroneous signal can be applied to a case where the second communication device retransmits the signal to the first communication device.
- a plurality of in-leave processing units and a plurality of din-reave processing units that perform mutually different in-leave operations are prepared, and the number of retransmitted buckets is determined in accordance with the number of retransmitted buckets.
- the present invention is not limited to this.
- the present invention is also applicable to a case where the processing unit is selectively used according to various conditions such as line quality. This can reduce the probability that the received packet is incorrect.
- the OFDM communication apparatus can be mounted on a communication terminal apparatus or a base station apparatus in a digital mobile communication system.
- an in-leaving process is performed on a transmission signal in accordance with the number of retransmissions of the transmission signal.
- a possible OFDM communication device can be provided. This description is based on Japanese Patent Application No. 11-239,091 filed on August 20, 2001. It is based on This content is included here. Industrial applicability
- the present invention is suitable for use in the field of OFDM communication devices that perform retransmission control.
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US09/806,313 US6950474B1 (en) | 1999-08-20 | 2000-07-26 | OFDM communication device |
EP00949893A EP1124344A4 (en) | 1999-08-20 | 2000-07-26 | OFDM COMMUNICATION DEVICE |
AU63143/00A AU6314300A (en) | 1999-08-20 | 2000-07-26 | Ofdm communication device |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP11233909A JP2001060934A (ja) | 1999-08-20 | 1999-08-20 | Ofdm通信装置 |
JP11/233909 | 1999-08-20 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2001015365A1 true WO2001015365A1 (fr) | 2001-03-01 |
Family
ID=16962497
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2000/004969 WO2001015365A1 (fr) | 1999-08-20 | 2000-07-26 | Dispositif de communication ofdm |
Country Status (5)
Country | Link |
---|---|
US (1) | US6950474B1 (ja) |
EP (1) | EP1124344A4 (ja) |
JP (1) | JP2001060934A (ja) |
AU (1) | AU6314300A (ja) |
WO (1) | WO2001015365A1 (ja) |
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- 2000-07-26 US US09/806,313 patent/US6950474B1/en not_active Expired - Fee Related
- 2000-07-26 EP EP00949893A patent/EP1124344A4/en not_active Withdrawn
- 2000-07-26 WO PCT/JP2000/004969 patent/WO2001015365A1/ja not_active Application Discontinuation
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US6950474B1 (en) | 2005-09-27 |
AU6314300A (en) | 2001-03-19 |
EP1124344A1 (en) | 2001-08-16 |
JP2001060934A (ja) | 2001-03-06 |
EP1124344A4 (en) | 2006-06-21 |
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