直接序列扩频非正交分组码索引调制技术研究  

Research on Direct Sequence Spread Spectrum Nonorthogonal Groupingcode Index Modulation Technology

作　　者：赵耿[1,2] 刘阿龙 马英杰 ZHAO Geng;LIU A-long;MA Ying-jie(School of Telecommunication Engineering,Xidian University,Xian Shaanxi 710071,China;Department of Electronic and Communication Engineering,Beijing Electronic Science and Technology Institute,Beijing 100070,China)

机构地区：[1]西安电子科技大学通信工程学院,陕西西安710071 [2]北京电子科技学院电子与通信工程系,北京100070

出　　处：《计算机仿真》2023年第7期249-253,266,共6页Computer Simulation

基　　金：国家自然科学基金资助项目(61772047);北京高校“高精尖”学科建设项目(3201017)。

摘　　要：为了进一步提高传统码索引调制(Code Index Modulation, CIM)的误码率性能和降低伪随机(Pseudo Noise, PN)码索引资源的耗费量,提出非正交分组-码索引调制(Nonorthogonal Grouping-Code Index Modulation, NG-CIM)方案。NG-CIM在发送端将每一个传输时隙并行分为调制块和映射块,调制块通过比特分组后映射成为多组调制符号,映射块为各组调制符号的正交分量和同相分量索引相同的PN码进行直接序列扩频传输。仿真结果表明,在加性高斯白噪声信道中,随着频谱效率的提升,NG-CIM的误码率性能较CIM有着约2~4dB的改善,同时PN码资源的耗费量也大大减少。In order to improve the BER performance of conventional Code Index Modulation(CIM)and reduce the consumption of Pseudo Noise(PN)code index resources,Nonorthogonal Grouping-Code Index Modulation(NG-CIM)scheme is proposed.The NG-CIM divides each transmission time slot into a modulation block and a mapping block in parallel at the transmitter side.The modulation block is mapped into multiple groups of modulation symbols by bit grouping,and the mapping block selects the same PN code for the orthogonal and in-phase components of each group of modulation symbols for direct sequence spread spectrum transmission.The simulation results show that in the additive white Gaussian noise channel,with the improvement of spectral efficiency,the BER performance of NG-CIM is improved approximately from 2dB to 4dB compared to CIM,and the consumption of PN code resources is greatly reduced.

关 键 词：码索引调制 非正交分组码索引调制 伪随机码 频谱效率 扩频传输 

分 类 号：TP391.9[自动化与计算机技术—计算机应用技术]