| 摘要: |
| 针对多载波系统中峰均功率比（Peak to Average Power Ratio，PAPR）普遍较高的问题，首先给出预编码技术抑制PAPR的基本思路和预编码矩阵的一般性设计规则;然后将降低信号峰值的问题转化为在信号瞬时功率均值不变的条件下最小化信号瞬时功率方差的优化问题;最后，为了使预编码矩阵能够联合改善载波的相位和发送信号的非周期自相关性以提高PAPR的抑制效果，基于梯度搜索算法提出一种将非周期自相关性和相位共同优化的算法求解上述最小化问题，通过互补误差函数（Complementary Cumulative Distribution Function，CCDF）表示对PAPR的抑制效果。仿真结果表明，该算法在不影响甚至稍微提高系统误码率性能的前提下，相比于预编码方法改善约0.8 dB。 |
| 关键词: 多载波系统 预编码技术；峰均功率比降低；互补误差函数 |
| DOI： |
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| 基金项目: |
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| An Improved PAPR Reduction Scheme Based on Precoding in Multi-carrier Systems |
| LUO Rui |
| (Chongqing Key Laboratory of Mobile Communication Technology,School of Communication and Information Engineering,Chongqing University of Posts and Telecommunications,Chongqing 400065,China) |
| Abstract: |
| In order to solve the problem of higher peak to average power ratio(PAPR) in multi-carrier systems,the basic idea of pre-coding technology for suppressing PAPR and the general design rules of pre-coding matrix are given.Then the problem of reducing the signal peak value is transformed into an optimization problem that minimizes the instantaneous power variance of the signal under the condition that the instantaneous power mean value of the signal is constant.Finally,in order to improve the PAPR suppression effect,the pre-coding matrix is considered to jointly improve the phase of the carrier and the aperiodic autocorrelation of the transmitted signal,thus an gradient search based algorithm is proposed to solve the above minimize problem,the inhibitory effect on PAPR is indicated by complementary cumulative distribution function(CCDF).The simulation results show that the proposed algorithm improves the bit error rate(BER) performance by about 0.8 dB compared with the pre-coding method. |
| Key words: multi-carrier system pre-coding technology PAPR reduction complementary cumulative distribution function |
《电讯技术》编辑部 