高速率广义空间码索引调制系统的性能分析  

Performance analysis of high-rate generalized space code index modulation system

作　　者：卞李娜 张倩瑜 吴佳燕 BIAN Lina;ZHANG Qianyu;WU Jiayan(Keyi College of Zhejiang Sci-Tech University,Shaoxing 312369,China)

机构地区：[1]浙江理工大学科技与艺术学院,浙江绍兴312369

出　　处：《电信科学》2025年第1期99-110,共12页Telecommunications Science

基　　金：浙江理工大学科技与艺术学院科研项目(No.KY2024033)。

摘　　要：传统的码索引调制(code index modulation,CIM)系统仅通过扩频码和星座符号来承载信息,能量效率和频谱效率都较低,而附加相位作为一种独特的调制符号来承载信息,具有低传输功耗的特点。为了充分利用多天线索引来提高频谱效率,提出了基于低功耗设计的高速率广义空间码索引调制(high-rate generalized space code index modulation,HR-GS-CIM)系统。HR-GS-CIM系统通过使用附加相位替代传统的调制符号,并且通过遗传算法(genetic algorithm,GA)来优化设计附加相位,展现了极高的能效优势和性能优势。同时,HR-GS-CIM系统通过引入广义和空间索引的方法,将附加相位、扩频码以及天线索引进行联合映射选择,并采用低复杂度的联合映射选择算法,极大地提高了系统频谱效率。此外,分析了HR-GS-CIM系统的理论性能,并且仿真验证了HR-GS-CIM系统的理论和仿真性能一致。最后,与传统的CIM系统等对比,验证了所提HR-GS-CIM系统具有显著的性能增益。Traditional code index modulation(CIM)systems only carry information through spreading codes and con‐stellation symbols,with low energy efficiency and spectral efficiency.However,adding phase as a unique modulation symbol to carry information has the advantage of low transmission power consumption.To fully utilize the multi-antenna lead to improve spectral efficiency,a high-rate generalized space code index modulation(HR-GS-CIM)sys‐tem with low-power design was proposed.The traditional modulation symbols were replaced with the additional phase by the HR-GS-CIM system,and the genetic algorithm(GA)was used to optimize the design of the additional phase,which could acquire high energy efficiency advantage and performance advantage.At the same time,the meth‐ods of generalized and spatial indexing were introduced to jointly map select the additional phase,spreading code,and antenna lead,and a low-complexity joint mapping selection algorithm was adopted to greatly improve the sys‐tem’s spectral efficiency.Furthermore,the theoretical performance of the HR-GS-CIM system was analyzed and the consistency between the theoretical and simulated performance was verified.Finally,compared with traditional CIM systems,the simulation results show that the proposed HR-GS-CIM system has significant performance gain.

关 键 词：码索引调制 附加相位 联合优化 频谱效率 

分 类 号：TN929.5[电子电信—通信与信息系统]