改进的OFDM雷达通信一体化信号峰均比抑制方法  

An Improved PAPR Suppression Method for OFDM Radar Communication Integration Signal

作　　者：宋瑶 靳标 徐朝阳[2] 朱晓华[3] SONG Yao;JIN Biao;XU Zhaoyang;ZHU Xiaohua(Ocean College,Jiangsu University of Science and Technology,Zhenjiang 212003,China;No.723 Research Institute of China,Shipbuilding Industry Corporation,Yangzhou 225001,China;School of Electronic and Optical Engineering,Nanjing University of Science and Technology,Nanjing 210094,China)

机构地区：[1]江苏科技大学海洋学院,江苏镇江212003 [2]中国船舶重工集团公司第七二三研究所,江苏扬州225001 [3]南京理工大学电子工程与光电技术学院,南京210094

出　　处：《火力与指挥控制》2023年第5期46-52,共7页Fire Control & Command Control

基　　金：国家自然科学基金(61701416,61871203,62001194);江苏省基础研究计划(自然科学基金)基金(BK20211341);江苏省研究生科研与实践创新计划基金资助项目(KYCX22_3819)。

摘　　要：正交频分复用(orthogonal frequency division multiplexing,OFDM)信号是雷达通信一体化系统常用的发射波形之一,但是其峰均比较高,影响发射机的工作效率。传统的限幅法虽然可以降低系统OFDM信号的峰均比(peak-to-average power ratio,PAPR),但会造成误码率(bit error rate,BER)增大和带外频谱泄露的问题。对传统的限幅法进行改进,将高于门限的信号进行抑制,通过迭代滤波消除带外信号弥散造成的频谱效率下降的问题。将改进峰均比抑制方法与传统峰均比抑制方法进行比较,验证了所提方法的低峰均比性能、误码率性能和模糊函数性能。仿真实验表明,所提方法通过合理设置限幅门限和选择迭代滤波次数,可以有效降低OFDM信号的PAPR,并且对雷达探测性能和通信性能影响较小。Orthogonal frequency division multiplexing(OFDM)signal is one of the commonly used transmitting waveforms in integrated radar and communication system.The peak-to-average power ratio is high,which affects the working efficiency of the transmitter.Although the traditional amplitude limiting method can reduce the peak-to-average power ratio(PAPR)of OFDM signal,it will increase the bit error rate and cause out-of-band frequency spectrum leakage.The traditional amplitude limiting method is improved.Firstly,the signal above the threshold is suppressed,and then the problem of spectral efficiency reduction caused by out-of-band signal dispersion is removed by iterative filtering.The improved PAPR suppression method is compared with the traditional PAPR suppression method to verify the low PAPR performance,bit error rate performance and ambiguity function performance of the proposed method.The simulation results show that the proposed method can effectively reduce the PAPR of OFDM signal by reasonably setting the amplitude limiting threshold and selecting the number of iterative filtering,and has little impact on the radar detection performance and communication performance.

关 键 词：OFDM 改进型限幅方法 PAPR 误码率 模糊函数 

分 类 号：TN951[电子电信—信号与信息处理]