基于合并码本的码字位置序号调制SCMA方案  

Merging codebook based codeword position index modulation scheme for SCMA

作　　者：杨颜冰 雷菁[1] 赖恪 YANG Yanbing;LEI Jing;LAI Ke(College of Electronic Science and Technology,National University of Defense Technology,Changsha 410073,China)

机构地区：[1]国防科技大学电子科学学院,湖南长沙410073

出　　处：《系统工程与电子技术》2024年第7期2498-2508,共11页Systems Engineering and Electronics

基　　金：湖南省自然科学基金(2021JJ30777)资助课题。

摘　　要：为满足后5G及未来6G时代对通信系统可靠性及频谱效率(spectral efficiency,SE)的严苛要求,针对上行稀疏码多址接入(sparse code multiple access,SCMA)系统,提出了一种基于合并码本的码字位置序号调制SCMA方案。该方案在时域拓展码字位置,使得码字位置全填充且由其序号携带额外信息比特,并能通过改变码字位置数和序号调制阶数灵活调整系统的谱效。此外,设计了基于消息传递算法(message passing algorithm,MPA)的联合检测算法,并给出了合并码本设计准则。系统分析及仿真结果表明,相较于其他序号调制方案,所提方案更好地兼顾了可靠性与SE,在误比特率(bit error rate,BER)性能与鲁棒性方面都有优势。To meet the rigorous demands for reliability and spectral efficiency(SE)in the beyond-5th generation mobile network(5G)and the upcoming 6th generation mobile network(6G),a merging codebook based codeword position index modulation scheme for sparse code multiple access(SCMA)is proposed for the uplink SCMA.The scheme expands the codeword position in the time domain,allowing the codeword positions to be fully populated and carry additional information bits by their index,and provides flexibility in adjusting the system SE by changing the codeword position number and the index modulation order.Furthermore,a corresponding joint detection algorithm based on message passing algorithm(MPA)is designed and the design criteria of the merging codebook are given.System analysis and simulation results show that compared with other index modulation schemes,the proposed scheme better balances reliability and SE,and also has advantages in bit error rate(BER)performance and robustness.

关 键 词：稀疏码多址接入 频谱效率 码字位置 序号调制 合并码本 

分 类 号：TN929.5[电子电信—通信与信息系统]