一种OFDM联合峰均比抑制算法  

A joint peak-to-average power ratio reduction algorithm in OFDM system

作　　者：李波 郑晨 王彦本 LI Bo, ZHENG Chen, WANG Yanben(School of Communication and Infomation Engineering, Xi＇an University of Posts and Teleoommunications, Xi＇an 710121, China)

机构地区：[1]西安邮电大学通信与信息工程学院,陕西西安710121

出　　处：《西安邮电大学学报》2018年第2期78-84,共7页Journal of Xi’an University of Posts and Telecommunications

基　　金：陕西省自然科学基础研究计划资助项目(2016JM6017)

摘　　要：针对正交频分复用(orthogonal frequency division multiplexing,OFDM)信号峰均比抑制算法的收敛速度慢,抑制性能低且难以同时兼顾峰均比抑制、误码率性能损失等问题,提出一种基于预留子载波技术(tone reservation,TR)的联合峰均功率比抑制算法。该算法的凸优化建模过程结合限幅噪声比(signal to clipping noise ratiotone reservation,SCR-TR)、智能梯度主动星座扩展(smart gradient projection-active constellation extension tone reservation,SGP-ACE TR)和最小平方逼近(least square approximation-tone reservation,LSA-TR)算法进行惩罚函数的加权组合优化,通过将上述方法加权组合在统一的迭代过程中,使得各种算法的优势互补。仿真结果表明,该算法仅需2次迭代,便可以超过其他经典算法经过6次迭代才能达到的峰均功率比抑制效果,由于迭代次数下降节约了优化时间;在信噪比较小的信道环境中,误码率性能优良;该算法的带外频谱扩散性能没有明显的恶化。To overcome the drawbacks of OFDM（orthogonal frequency division multiplexing）signal in low convergence rate,poor performance of PAPR（peak to average power ratio）,difficulties in balancing PAPR,and losing of bit error rate performance,ajoint peak to average power ratio reduction algorithm based on tone reservation in OFDM system is proposed.The convex optimization modeling process is weighted combinatorial optimization of penalty function by the SCR-TR（signal to clipping noise ratio-tone reservation）,the smart gradient projection-active constellation extension tone reservation and the least square approximation algorithm.All the above methods are weighted in a unified iterative process to make the advantages of various algorithms complement each other.Simulation results indicate that the PAPR performance of the new approach with twice iteration is better than the other classic algorithms with six times iteration.With less iteration,the new algorithm is more optimizing efficient.This new approach can get better bit error rate in the channel environment with small bit signal to noise ration.The out-of-band spectrum spreading performance of the new algorithm also doesn＇t have observed deterioration.

关 键 词：正交频分复用 峰均功率比 预留子载波 收敛速度 

分 类 号：TP393[自动化与计算机技术—计算机应用技术]