四维DSSS调制信号的峰均比抑制  

Peak-to-Average Ratio Suppression of Four-dimensional Direct Sequence Spread Spectrum Modulated Signals

作　　者：华博 毛忠阳 康家方 缪幸吉 杨凡 HUA Bo;MAO Zhongyang;KANG Jiafang;MIAO Xingji;YANG Fan(Aeronautical Communications Teaching and Research Office,Naval Aeronautical University,Yantai 264001,China;Naval Equipment Department,Hanzhong 723213,China)

机构地区：[1]海军航空大学航空通信教研室,山东烟台264001 [2]海军装备部,陕西汉中723213

出　　处：《电讯技术》2021年第5期627-633,共7页Telecommunication Engineering

基　　金：国家自然科学基金资助项目(61701518)。

摘　　要：针对四维直接序列扩频调制信号的峰均比(Peak-to-Aaverage Ratio,PAPR)问题,分析了成形滤波器滚降因子对调制信号PAPR的影响,得到了PAPR随滚降因子的变化规律,进一步引入了基于限幅的PAPR抑制方法降低调制信号的PAPR。理论和仿真结果表明,当滚降因子为0.42时,调制信号的PAPR值最小;所引入的PAPR抑制方法能有效降低调制信号的PAPR,同时对系统误码性能的影响极小,当限幅率为4、系统互补累积概率密度为0.1%时,调制信号PAPR降低了0.8 dB,系统误码率为10-5所对应的信噪比损失仅为0.3 dB。The rule about the peak-to-average ratio(PAPR)of four-dimensional direct sequence spread spectrum(DSSS)modulated signal is obtained,which reveals the relationship between the signal PAPR and the roll-off factor of the shaping filter.The influence of roll-off factor of shaping filter on the modulated signal PAPR is analyzed,and the clipping-based PAPR suppression method is further introduced to reduce the modulated signal PAPR.Theoretical and simulation results show that when the roll-off factor is 0.42,the PAPR value of the modulated signal is the smallest;the PAPR suppression method introduced can effectively reduce the PAPR of the modulation signal,and has little impact on the system bit error performance.When the clipping rate is 4 and the system complementary cumulative probability density is 0.1%,the PAPR of the modulated signal is reduced by 0.8 dB,and when the bit error rate is 10-5,the signal-to-noise ratio loss is only 0.3 dB.

关 键 词：四维直接序列扩频调制 峰均比抑制 希尔伯特变换 滚降因子 

分 类 号：TN911.6[电子电信—通信与信息系统]