WO2002015507A1 - Procede et systeme de reduction du rapport entre la puissance de crete et la puissance moyenne d'un signal de type onde multiporteuse - Google Patents

Procede et systeme de reduction du rapport entre la puissance de crete et la puissance moyenne d'un signal de type onde multiporteuse Download PDF

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Publication number
WO2002015507A1
WO2002015507A1 PCT/CN2001/001164 CN0101164W WO0215507A1 WO 2002015507 A1 WO2002015507 A1 WO 2002015507A1 CN 0101164 W CN0101164 W CN 0101164W WO 0215507 A1 WO0215507 A1 WO 0215507A1
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Prior art keywords
signal
compensation
ratio
sum
average power
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PCT/CN2001/001164
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English (en)
French (fr)
Inventor
Qing Chu
Huabing Jiang
Jing Wang
Peng Li
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Huawei Technologies Co., Ltd.
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Priority claimed from CNB001196243A external-priority patent/CN1164063C/zh
Priority claimed from CN 00119623 external-priority patent/CN1129289C/zh
Application filed by Huawei Technologies Co., Ltd. filed Critical Huawei Technologies Co., Ltd.
Priority to AU2002214917A priority Critical patent/AU2002214917A1/en
Priority to EP01983405A priority patent/EP1324556A4/en
Publication of WO2002015507A1 publication Critical patent/WO2002015507A1/zh
Priority to US10/367,419 priority patent/US7236533B2/en

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    • 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
    • H04L27/2614—Peak power aspects

Definitions

  • the invention relates to a method for reducing the ratio of peak power to average power of a multi-carrier signal in a digital communication system and a device using the method.
  • the RF amplifier in the RF unit works best when the modulation signal is maintained at a fairly constant level, and large peaks will either result in inefficient use of the amplifier or cause linearity If the degree becomes worse. Therefore, the RF amplifier wants the ratio of the peak power of the modulated signal to the average power as close as possible.
  • Odbo as shown in Figure 1 is a digital intermediate frequency transmitter of a multi-carrier system.
  • the digital signal is modulated by a baseband unit and up-converted, and then passed through a DAC (digital-to-analog converter) to enter the radio frequency unit.
  • DAC digital-to-analog converter
  • the multi-carrier modulation method uses several data streams to modulate several carriers in parallel.
  • a multi-user multi-carrier modulated composite signal is formed at the base station, so that the base station shares a digital IF transmitter instead of using one transmitter for one carrier, which can reduce production costs and thus obtain good economic benefits.
  • the biggest disadvantage of this multi-carrier modulation method is that the synthesized signal exhibits a high ratio of peak power to average power, that is, the maximum power is much larger than the average power.
  • amplifying the synthesized signal requires a large linear dynamic range. This also means that designers are forced to use an amplifier with a large linear range, whose peak power is much larger than the average power of the signal, which will undoubtedly greatly increase the cost of the system. Therefore, without reducing other performance indicators, it is the goal of the designer to reduce the ratio of the peak power to the average power of the composite signal as much as possible so that the signal has a constant envelope or as close to a constant envelope as possible.
  • the out-of-band compensation method is a relatively new method.
  • the basic principle is to generate a A fixed out-of-band compensation signal, so that the envelope of the synthesized signal after the original signal and the compensation signal are added is approximately constant or the ratio of the signal peak power to the average power is reduced, and the power of the compensation signal and the system bit error rate are required to be as possible as possible Small, synthesized signals can also meet the requirements of the protocol. Because the compensation signal is added out of band, it has little effect on the original signal.
  • the main disadvantages of this method are: When more compensation is required, the calculation is complicated and cumbersome, and it is often not possible to realize real-time operations. At the same time, it cannot be solved at many points of the signal. At this time, the compensation method may not improve the ratio of the peak power to the average power of the signal. When the compensation is small, the improvement of the ratio of peak power to average power is limited. Therefore, this method is difficult to achieve practicality.
  • Probabilistic clipping is another basic method. Its principle is: when the signal amplitude exceeds a certain threshold, its amplitude is set to this threshold, and the signal whose amplitude does not exceed this threshold is not processed.
  • the object of the present invention is to provide a method and a device for reducing the ratio of the peak power to the average power of a multi-carrier signal. This method can not only ensure signal quality, but also reduce signal noise.
  • ⁇ P A method for reducing the ratio of the peak power to the average power of a multi-carrier signal, which is characterized in that the multi-carrier signals are separately modulated and then added to form a sum signal, and according to the sum The single-path compensation or joint compensation is performed by at least one channel calculation and search to obtain the corresponding compensation signal, and the compensation signal and the sum signal are added to generate a compensated signal.
  • the method further includes the following steps: by selecting an appropriate clipping amplitude, the compensated signal is subjected to probability clipping again to output a standard signal.
  • the steps of calculating and searching for the obtained compensation signal are:
  • the joint compensation search step in step 4) is: making the amplitude of a compensation signal within a specified range change in a certain step, and Calculate whether there is a solution for the other compensation signal at this time. If there is a solution that meets the specified requirements, take the value at this time and exit the search cycle; otherwise, continue searching until it is out of range.
  • the joint compensation calculation step in step 4) is: calculating the phase of the sum signal vector and the first compensation signal vector at a sampling time; Phase of two inverse vectors; if the phase of the second compensation signal vector is between the two inverse vector phases, the second compensation signal is directly used for compensation; otherwise, the reverse signal of the second compensation signal is used for joint compensation .
  • the compensation signal is an amplitude-modulated and phase-modulated signal.
  • the present invention may also be implemented by a device implementing the above method. That is, a device for reducing a ratio of peak power to average power of a multi-carrier signal, which is characterized in that it includes: a modulator, and The signals are modulated separately, and the modulated signals are output.
  • the sum generator receives the signals output by the modulator, adds them to form a sum signal and outputs it; the compensation generator receives the sum signal from the sum generator. Perform at least one calculation and search to form a compensation signal and output the compensation signal; the adder receives the sum signal and the compensation signal from the sum generator and the compensation generator respectively, adds them, and outputs the compensated signal.
  • the device for reducing the ratio of the peak power to the average power of a multi-carrier signal may further include: a probability clipper that receives a compensated signal from an adder, and selects a proper clipped amplitude to perform a probability clip on the compensated signal. Wave, and finally output a standard signal.
  • FIG. 1 is a structural functional block diagram of a conventional digital intermediate frequency transmitter
  • FIG. 2 is a functional block diagram of the device of the present invention
  • FIG. 3 is a flowchart of calculating and searching for a compensation signal in the method of the present invention.
  • Fig. 4 is a compensation diagram of vector representation. The best embodiment of the present invention
  • the device for reducing the ratio of the peak power to the average power of a multi-carrier signal includes: a modulator 22 that modulates an input multi-carrier signal and outputs the modulated signals; 23. Receive the signals output by the modulator 22 and add them to form a sum signal and output it; a compensation generator 26 receives the sum signal from the sum generator 23 and performs at least one calculation and search to form a compensation signal And the compensation signal is output; the adder 24 receives the sum signal and the compensation signal from the sum generator 23 and the compensation generator 26 respectively, adds them, and outputs the compensated signal; the probability clipper 25, from the adder 24 After receiving the compensated signal, by selecting an appropriate clipping amplitude, the compensated signal is subjected to probability clipping, and finally a standard signal is output.
  • the multi-carrier signal 21 After the multi-carrier signal 21 passes through the modulator 22, the multi-carrier signal 21 is added to a sum signal to become a sum signal.
  • the sum signal is input to the compensation generator 26 for calculation and search, and a corresponding compensation signal can be calculated.
  • the compensation signal and the original sum signal are added in the adder 24.
  • the signal points At this time, with the exception of a few unsolved points, most of the signal points have reached our required peak power to average power ratio.
  • the original compensation algorithm requires that the compensation self-signal be approximately constant envelope.
  • the method for reducing the ratio of the peak power to the average power of a multi-carrier signal according to the present invention is as follows: After the multi-carrier signals are separately modulated, they are added to form a sum signal, and according to the sum signal, at least one channel is calculated. Perform single-path compensation or joint compensation with search to obtain corresponding compensation signals, add each compensation signal and a sum signal to generate a compensated signal, and then select the proper clipping amplitude to probabilistically cut the compensated signal. Wave, and finally output a standard signal. As shown in FIG. 3, in the above process, the steps of performing calculation and searching to obtain a compensation signal are ⁇
  • the allowable range For each sample point value of the sum signal, first determine whether it is within the allowable range: For constant envelope compensation, the allowable range is within ⁇ 5% of the constant envelope value; for other compensation, as long as The absolute value of the sample point value may be less than the maximum value. For the sample points of the sum signal in the allowable range, the sample point value of the corresponding compensation signal is set to 0, otherwise, the following steps are performed;
  • the search steps for joint compensation are: make the amplitude of one compensation signal change within a specified range by a certain step, and simultaneously calculate whether another compensation signal has a solution at this time. If required, take the value at this time and exit the search cycle; otherwise, continue searching until it is out of range.
  • the compensation signal can be an AM signal.
  • the compensation signal can be obtained by solving the equation.
  • the compensation signal has a negative solution, it means that the signal is not a pure amplitude modulation signal, but an amplitude modulation phase modulation signal.
  • phase of the second compensation signal vector is between the phases of two inverse vectors, joint compensation can be performed; otherwise, joint compensation cannot be performed.
  • the algorithm for judging the effectiveness of joint compensation is mainly realized by the method of vector analysis.
  • the basic thinking is as follows:
  • the multi-carrier signal can be equivalent to a signal vector of an IQ plane.
  • the modulus of the vector is 2 (t) + Q 2 ( ⁇ ).
  • the 5 phase can also be determined by Q (t) , l (t); and the compensation signal y (t ) Can be represented by a vector rotating counterclockwise, and its rotational angular velocity is modulo a (t).
  • the radius of the circle in FIG. 4 represents the required constant envelope size in the case of constant envelope compensation, and the maximum value of the allowed composite signal envelope in the case of non-constant envelope compensation.
  • the first compensation signal vector (: 3 ⁇ 41 ) and its inverse vector, the multi-carrier signal vector ( ⁇ ) and two tangents at its endpoints divide the plane into 6 regions. If there is a compensation signal in areas 1, 4, the compensation can be completed (if in area 4, the inverse vector is used for compensation); if the vector of the second compensation signal is in 1 ⁇ 2, 5, then ( ) Complete joint compensation; if the second vector is in the 3, 6 area, complete joint compensation with the inverse vector of (). It can be seen that the two compensation signals can be used to compensate in all cases.
  • the invention proposes a method for reducing the ratio of the peak power and the average power of a signal by combining probability clipping and out-of-band compensation.
  • the signal is compensated with the compensation signal, and the compensation signal is obtained through a certain calculation and search.
  • the compensation signal is obtained through a certain calculation and search.
  • clipping the signal can play a very good role.
  • the invention can solve the problem that the ratio of the peak power to the average power of the signal cannot be improved due to no solution of the compensation signal.
  • the effect on the signal in the band will not be as large as that of simple clipping.
  • the ratio of the peak power and the average power of the signal is greatly reduced, and the use efficiency of the RF amplifier is improved, and Reduced system cost.

Description

降低多载波信号峰值功率对平均功率之比的方法和装置 技术领域
本发明涉及数字通信系统中一种降低多载波信号峰值功率对平均功率之 比的方法及其使用该方法的装置。 背景技术
在数字通信系统， 尤其是移动通信系统中， 在给定信道条件下寻找性能优 越的高调制方式一直是重要的研究项目。 对于数字中频发射机的射频单元而 言， 调制信号保持在一个相当恒定的电平时， 射频单元中的射频放大器工作得 最好， 而大的峰值要么会导致放大器的低效率使用， 要么会引起线性度变差的 情况。 因此射频放大器希望调制信号的峰值功率对平均功率之比尽可能的接近
Odbo如图 1是一种多载波系统的数字中频发射机，数字信号通过基带单元调制 和上变频器后再通过 DAC (数模转换器） ， 就进入到射频单元。 如果系统没有 对多载波信号的峰值功率与平均功率之比进行必要的限制， 则为了保证信号不 失真和避免频谱扩散， 射频单元中的射频放大器的最大功率会远远大于平均功 率。 这既造成了射频单元的浪费， 同时也给射频单元的设计造成了相当的麻 烦。
而目前， 多载波调制的方法是用若干个数据流来并行调制若干个载波。 在 基站形成多用户多载波调制的合成信号， 使基站共用数字中频发射机， 而不是 一个载波采用一台发射机， 这样就可降低生产成本， 从而获得良好的经济效 益。 而该多载波调制的方法最大的缺点是合成后的信号呈现很高的峰值功率与 平均功率之比， 也就是最大功率远大于平均功率。 为了避免失真和减小谱扩 散， 对合成后的信号进行放大需要有很大的线性动态范围。 这同时也意味着设 计人员被迫去使用一个线性范围很大的放大器， 其峰值功率远远大于信号的平 均功率， 这无疑会大大提高系统的成本。 因此在不降低其他性能指标的前提下 尽可能多地降低合成信号的峰值功率与平均功率之比， 使信号尽可能恒包络或 接近恒包络， 就成为设计人员的目标。
带外补偿方法是一种较新颖的方法。 其基本原理是根据输入信号， 生成一 定的带外补偿信号， 使原信号和补偿信号相加后所得合成信号的包络近似恒定 或是信号峰值功率与平均功率之比降低， 并要求使补偿信号的功率和系统误码 率尽可能小， 合成信号也可以满足协议的要求。 由于补偿信号加在带外， 故对 原信号影响较小。 该方法的主要缺点是： 当要求补偿较多时， 计算复杂繁琐， 往往不一定可以实现实时运算。 同时在信号的很多点上无法求解， 此时补偿方 法不一定可以改善信号的峰值功率与平均功率之比。 当补偿较小则对峰值功率 与平均功率之比的改善有限。 因此， 该方法很难达到实用程度。
概率削波是另一种基本的方法， 其原理是： 当信号幅度超过某一门限时， 则将其幅度设定为此门限， 而对幅度未超过此门限的信号不作任何处理。
要减小信号的峰值功率， 使其峰值功率与平均功率之比满足要求， 就要将 超出门限的信号全部或大多数限制在门限以内。 但进行削波之后， 信号强度变 弱， 带内噪声影响明显， 对于信号的传输会带来一定的影响， 要提高削波的幅 度门限， 就要求提高较大的功率， 这样就会增加成本、能源和其他方面的需求。 这个原因也制约着削波技术的应用。
本发明的目的在于提供一种降低多载波信号峰值功率对平均功率之比的 方法和装置， 该方法不仅能保证信号质量， 而且降低信号噪音。 发明内容
为了实现上述目的， 本发明， §P : 降低多载波信号峰值功率对平均功率之 比的方法， 其特点为： 多载波信号分别经过调制后，进行相加形成一和路信号， 并根据该和路信号， 由至少一路以上的计算和搜索进行单路补偿或联合补偿， 获取相应的补偿信号， 将该补偿信号和所述的和路信号相加产生一补偿后信 号。
在上述的降低多载波信号峰值功率对平均功率之比的方法中， 还包括下列 步骤： 通过选取适当削波的幅度， 将所述补偿后信号再进行概率削波， 输出一 标准信号。
在上述的降低多载波信号峰值功率对平均功率之比的方法中， 计算和搜索 获取的补偿信号的步骤为：
1) 对于和路信号的每个样点值均先进行是否在允许范围内的判断：对于恒 包络补偿， 则允许范围是恒包络值的 ±5%范围内； 对于其它补偿， 则只要样点 值的绝对值小于最大值即可， 对于处于允许范围内的和路信号的样点， 相应的 补偿信号的样点值赋为 0， 否则， 进行以下步骤运算；
2) 计算第一个补偿信号是否有解， 如果有解， 则用此信号进行补偿；
3) 如果第一个补偿信号无解， 计算第二个补偿信号是否有解， 如果有解， 则用此信号进行补偿；
4) 如果第二个补偿信号仍然无解， 则进行联合补偿， 利用搜索算法求解。 在上述的降低多载波信号峰值功率对平均功率之比的方法中， 其步骤 4)中 的联合补偿搜索步骤为： 令一路补偿信号的幅度在某一指定范围内按一定步长 进行变化， 同时计算此时另一补偿信号是否有解， 若有解且符合指定的要求， 则取此时的数值并跳出搜索循环； 反之， 则继续搜索直至超出范围。
在上述的降低多载波信号峰值功率对平均功率之比的方法中，步骤 4)中的 联合补偿计算步骤为： 计算某抽样时刻的和路信号矢量与第一路补偿信号矢量 的相位； 计算两个反矢量的相位； 如果第二路补偿信号矢量的相位介于两个反 矢量相位之间， 则直接用第二路补偿信号补偿； 反之， 则用第二路补偿信号的 反信号进行联合补偿。
在上述的降低多载波信号峰值功率对平均功率之比的方法中， 补偿信号是 一种调幅调相信号。
为了实现上述目的， 本发明还可以通过实现上述方法的装置来实现， 艮卩： 降低多载波信号峰值功率对平均功率之比的装置，其特点为， 它包括： 调制器， 对输入的多载波信号分别进行调制， 并输出调制后的各信号； 和路器， 接收调 制器输出的各信号， 进行相加， 形成一和路信号并输出； 补偿生成器， 从和路 器中接收和路信号进行至少一路以上的计算和搜索， 形成补偿信号， 并输出该 补偿信号； 加法器， 从和路器和补偿生成器中分别接收和路信号和补偿信号， 进行相加， 输出补偿后信号。
上述的降低多载波信号峰值功率对平均功率之比的装置， 还可包括： 概率 削波器， 从加法器中接收补偿后信号， 通过选取适当削波的幅度， 将该补偿后 信号进行概率削波， 最后输出一标准信号。 附图概述
图 1是现有的数字中频发射机的结构功能框图； 图 2是本发明装置的功能结构框图；
图 3是本发明方法中计算和搜索获取补偿信号的流程图；
图 4是矢量表示的补偿示意图。 本发明的最佳实施方案
如图 2所示， 本发明降低多载波信号峰值功率对平均功率之比的装置， 它 包括：调制器 22，对输入的多载波信号分别进行调制，并输出调制后的各信号； 和路器 23， 接收调制器 22输出的各信号， 进行相加， 形成一和路信号并输出； 补偿生成器 26，从和路器 23中接收和路信号进行至少一路以上的计算和搜索， 形成补偿信号， 并输出该补偿信号； 加法器 24， 从和路器 23和补偿生成器 26 中分别接收和路信号和补偿信号，进行相加，输出补偿后信号；概率削波器 25， 从加法器 24中接收补偿后信号，通过选取适当削波的幅度，将该补偿后信号进 行概率削波， 最后输出一标准信号。
多载波信号 21经过调制器 22后， 在和路器 23相加变成一和路信号。 对 该和路信号输入到补偿生成器 26中进行计算和搜索，可以计算出相应的补偿信 号。 然后用补偿信号和原和路信号在加法器 24 中相加， 这时除少数无解点以 外， 大部分的信号点都已经达到我们的所要求的峰值功率与平均功率之比。 这 时我们将信号通过削波单元 25， 剩余的无解点也会被削掉。 由于无解点的个数 较小， 故削波对信号的影响也比单纯的削波要小的多。 原有的补偿算法要求补 偿自信号近似为恒包络， 这一要求使对补偿信号的求解在比较多的点会遭到失 败， 并使算法复杂。 为此可以稍稍放宽一下对补偿的要求， 不要要求补偿后的 信号为恒包络的信号， 而为近似恒包络的信号， 虽然峰值功率与平均功率之比 比恒包络稍高， 但运算量会有很大程度的下降， 同时补偿信号的幅度会大大减 小。 这样也减小了对于原信号的干扰。 为了进一步减小无解点的个数， 还可以 采用两路补偿信号联合补偿的算法。
本发明降低多载波信号峰值功率对平均功率之比的方法， 其过程为： 多载 波信号分别经过调制后， 进行相加形成一和路信号， 并根据该和路信号， 由至 少一路以上的计算和搜索进行单路补偿或联合补偿， 获取相应的补偿信号， 将 各补偿信号和一和路信号相加产生一补偿后信号， 而后通过选取适当削波的幅 度， 将该补偿后信号进行概率削波， 最后输出一标准信号。 如图 3所示， 上述过程中， 进行计算和搜索获取补偿信号的步骤为-
1) 对于和路信号的每个样点值均先进行是否在允许范围内的判断：对于恒 包络补偿， 则允许范围是恒包络值的 ±5%范围内； 对于其它补偿， 则只要样点 值的绝对值小于最大值即可， 对于处于允许范围内的和路信号的样点， 相应的 补偿信号的样点值赋为 0， 否则， 进行以下步骤运算；
2) 计算第一个补偿信号是否有解， 如果有解， 则用此信号进行补偿；
3) 如果第一个补偿信号无解， 计算第二个补偿信号是否有解， 如果有解， 则用此信号进行补偿；
4) 如果第二个补偿信号仍然无解， 则先判断是否可以联合补偿， 如果可 以， 则利用搜索算法求解；
5) 如果不能进行联合补偿或未搜索到有效解， 则使两信号幅度为 0， 即不 进行补偿。
如果允许负解， 贝 lj : 如果第二个补偿信号仍然无解， 则进行联合补偿。 上述的过程中， 联合补偿的搜索步骤为： 令一路补偿信号的幅度在某一指 定范围内按一定步长进行变化， 同时计算此时另一补偿信号是否有解， 若有解 且符合指定的要求， 则取此时的数值并跳出搜索循环； 反之， 则继续搜索直至 超出范围。
补偿信号可以采用的是一种调幅信号， 补偿信号的求取是通过解方程的方 法来求取的。 当补偿信号出现负解的时候， 意味着信号不是一个单纯的调幅信 号， 而是一个调幅调相信号。 在本算法中对补偿信号求解时我们全取正解。
判断联合补偿有效性的算法为：
计算某抽样时刻的和路信号矢量与第一路补偿信号矢量的相位；
计算两个反矢量的相位；
如果第二路补偿信号矢量的相位介于两个反矢量相位之间， 则可以联合补 偿； 反之， 不能联合补偿。
判断联合补偿有效性的算法主要是通过矢量分析的方法来实现的。 基本思 路如下：
可将多载波信号等效为一个 I-Q 平面的信号矢量， 矢量的模为 2 ( t)+ Q 2 ( ί) 5 相位也可由 Q(t)， l(t)确定； 而补偿信号 y(t)则可用沿逆时针方 向旋转的矢量表示， 其旋转角速度为 ， 模为 a(t)。 图 4中圆的半径在恒包络补偿情况下代表所要求的恒包络的大小， 在非恒 包络补偿情况下代表所允许的合成信号包络的最大值。
当采用两个信号联合补偿时， 此时的情况较为复杂， 很难用数学推导的方 法得出结论， 用信号矢量的方法进行分析， 经过研究与测试， 归纳总结了联合 补偿时无正解的情况， 此结论可归纳为：
当第二路补偿信号矢量落在第一路补偿信号矢量的反矢量与原信号矢量 的反矢量所夹的区域中时， 可以进行联合补偿； 反之， 则无法进行联合补偿。 但由于我们可以用补偿信号的反矢量进行补偿。 对于这种情况， 我们可以认为 相当于补偿信号的相位跳变 180度， 此时补偿信号实际上含有调相的成分。 在 考虑到反矢量的情况下， 釆用两路补偿信号就可做到在所有情况下均能补偿， 具体分析见图 4。 ― ―
图 4中， 第一路补偿信号矢量（：¾1 )及其反矢量， 多载波信号矢量（^)及 其端点的两条切线将平面划分为 6 个区域。 如果有一个补偿信号在区域 1， 4 中即可完成补偿 （如果在区域 4中， 贝用其反矢量进行补偿） ； 如果第二个补 偿信号的矢量在 1^ 2， 5中， 则与（ )完成联合补偿； 如果第二个矢量在 3， 6区域中， 则与（ )的反矢量完成联合补偿， 由此可见， 采用两路补偿信号就 可做到在所有情况下均能补偿。
当补偿结束后， 还会存在一些无解点， 或少数补偿效果较差的点。 此时进 行削波， 就可以将峰值功率与平均功率之比降到要求的范围， 同时由于这样的 点个数较少， 由削波所带来的带内噪声也较小。 工业应用性
本发明提出了一种结合概率削波和带外补偿的降低信号峰值功率与平均 功率之比的方法， 首先用补偿信号对信号进行补偿， 先通过一定的计算和搜索 来获取补偿信号。 加入补偿信号后， 再通过适当的选取削波的幅度， 对信号进 行削波就可以起到很好的作用。 本发明可以解决补偿信号无解引起的无法改善 信号峰值功率与平均功率之比问题。 同时对信号在带内的影响也不会如同单纯 削波那么大， 在保证信号质量的前提下较大程度的降低信号的峰值功率和平均 功率之比， 同时提高了射频放大器的使用效率， 并降低了系统的成本。

Claims

权 利 要 求 书
1. 一种降低多载波信号峰值功率对平均功率之比的方法， 其特征在于- 多载波信号分别经过调制后， 进行相加形成一和路信号， 并根据该和路信 号， 由至少一路以上的计算和搜索进行单路补偿或联合补偿， 获取相应的补偿 信号， 将该补偿信号和所述的和路信号相加产生一补偿后信号。
2. 根据权利要求 1 所述的一种降低多载波信号峰值功率对平均功率之比 的方法， 其特征在于： 所述方法还包括下列步骤：
通过选取适当削波的幅度， 将所述补偿后信号再进行概率削波， 输出一标 准信号。
3. 根据权利要求 1 所述的一种降低多载波信号峰值功率对平均功率之比 的方法， 其特征在于， 所述的计算和搜索获取的补偿信号的步骤为-
1) 对于和路信号的每个样点值均先进行是否在允许范围内的判断：对于恒 包络补偿， 则允许范围是恒包络值的 ±5%范围内； 对于其它补偿， 则只要样点 值的绝对值小于最大值即可， 对于处于允许范围内的和路信号的样点， 相应的 补偿信号的样点值赋为 0， 否则， 进行以下步骤运算； .
2) 计算第一个补偿信号是否有解， 如果有解， 则用此信号进行补偿；
3) 如果第一个补偿信号无解， 计算第二个补偿信号是否有解， 如果有解， 则用此信号进行补偿；
4) 如果第二个补偿信号仍然无解， 则进行联合补偿， 利用搜索算法求解。
4. 根据权利要求 3 所述的一种降低多载波信号峰值功率对平均功率之比 的方法， 其特征在于， 所述步骤 4)中的联合补偿搜索步骤为： 令一路补偿信号 的幅度在某一指定范围内按一定步长进行变化， 同时计算此时另一补偿信号是 否有解， 若有解且符合指定的要求， 则取此时的数值并跳出搜索循环； 反之， 则继续搜索直至超出范围。
5. 根据权利要求 3 所述的一种降低多载波信号峰值功率对平均功率之比 的方法， 其特征在于， 所述步骤 4)中的联合补偿计算步骤为：
计算某抽样时刻的和路信号矢量与第一路补偿信号矢量的相位；
计算两个反矢量的相位；
如果第二路补偿信号矢量的相位介于两个反矢量相位之间， 则直接用第二 路补偿信号补偿； 反之， 则用第二路补偿信号的反信号进行联合补偿。
6. 根据权利要求 1 所述的一种降低多载波信号峰值功率对平均功率之比 的方法， 其特征在于： 所述的补偿信号是一种调幅调相信号。
7. 一种降低多载波信号峰值功率对平均功率之比的装置， 其特征在于， 它包括：
调制器， 对输入的多载波信号分别进行调制， 并输出调制后的各信号； 和路器， 接收调制器输出的各信号， 进行相加， 形成一和路信号并输出； 补偿生成器， 从和路器中接收和路信号进行至少一路以上的计算和搜索， 形成补偿信号， 并输出该补偿信号；
加法器， 从和路器和补偿生成器中分别接收和路信号和补偿信号， 进行相 加， 输出补偿后信号。
8. 根据权利要求 7所述的一种降低多载波信号峰值功率对平均功率之比 的装置， 其特征在于， 它还包括：
概率削波器， 从加法器中接收补偿后信号， 通过选取适当削波的幅度， 将 该补偿后信号进行概率削波， 最后输出一标准信号。
PCT/CN2001/001164 2000-08-17 2001-07-09 Procede et systeme de reduction du rapport entre la puissance de crete et la puissance moyenne d'un signal de type onde multiporteuse WO2002015507A1 (fr)

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