基于Hilbert成型波形变换的基带DSSS调制方法  

Baseband DSSS Modulation Method Based on Hilbert Transform

作　　者：康家方 王红星 钟佩琳 刘传辉 KANG Jia-fang;WANG Hong-xing;ZHONG Pei-lin;LIU Chuan-hui(Department of Aeronautical Communication,Naval Aviation University,Yantai Shandong 264001;Key Laboratory on Signal&Information Processing of Shandong Province,Naval Aviation University,Yantai Shandong 264001)

机构地区：[1]海军航空大学航空通信教研室,山东烟台264001 [2]海军航空大学信号与信息处理山东省重点实验室,山东烟台264001

出　　处：《电子科技大学学报》2020年第2期201-205,共5页Journal of University of Electronic Science and Technology of China

基　　金：国家自然科学基金(61701518);山东省“泰山学者”建设工程专项经费项目。

摘　　要：针对传统直接序列扩频调制系统传输速率和频谱效率低的问题,基于扩频码、扩频调制信号和希尔伯特(Hilbert)变换的优良特性,对原基带成型函数进行Hilbert变换,得到新的成型函数。利用两个基带成型函数并行传输两路基带信息,提出了基于Hilbert成型波形变换的基带直接序列扩频调制方法,并对调制信号支路间、码间干扰特性进行了理论分析和仿真实验。结果表明:加性高斯白噪声信道条件下,该方法在不降低系统传输性能、不扩展系统传输带宽、不增大单位比特信息发射功率的前提下,将基于单一扩频码的直接序列扩频调制系统的传输速率提高到原来的2倍。As the transmission rate and bandwidth efficiency of tradition direct sequence spread spectrum(DSSS)system are relatively low.Based on the basic characteristics of spread sequences,DSSS modulated signals and the theories of Hilbert transformation,a novel DSSS baseband modulation method is proposed.Theoretical analysis and simulation experiments are carried out on the characteristics of inter branch and intersymbol interference of modulated signal.Results show that under additive white Gaussian noise(AWGN)channel,compared with tradition DSSS system based on a single pseudo-random code,the novel method doubled the transmission rate without decreasing the BER performance or increasing the transmission bandwidth or increasing the signal power per bit.

关 键 词：频谱效率 直接序列扩频 希尔伯特变换 码间干扰 

分 类 号：TN911.3[电子电信—通信与信息系统]