基于低密度叠加编码调制的新型上行非正交多址接入方案

doi:10.13190/j.jbupt.2017-215

北京邮电大学学报 ›› 2018, Vol. 41 ›› Issue (3): 14-19.doi: 10.13190/j.jbupt.2017-215

基于低密度叠加编码调制的新型上行非正交多址接入方案

蒋成鑫, 吴湛击

北京邮电大学信息与通信工程学院, 北京 100876

收稿日期:2017-11-01 出版日期:2018-06-28 发布日期:2018-06-04
作者简介:蒋成鑫(1989-),男,博士生;吴湛击(1977-),男,教授,博士生导师,E-mail:wuzhanji@bupt.edu.cn.
基金资助:
国家自然科学基金项目（61171101）

A Novel Low Density Superposition Modulation Scheme for Uplink NOMA

JIANG Cheng-xin, WU Zhan-ji

School of Information and Communication Engineering, Beijing University of Posts and Telecommunications, Beijing 100876, China

Received:2017-11-01 Online:2018-06-28 Published:2018-06-04

摘要/Abstract

摘要： 稀疏码分多址接入（SCMA）方案映射矩阵维度太小时，短环和规则度分布的SCMA映射矩阵与存在远近效应的环境不能很好地匹配，为此，提出一种新型的非正交多址接入方案——低密度叠加编码调制（LDSM）.该方案设计了更加稀疏的非规则度分布映射矩阵，带来分集增益和编码增益，提高整体方案性能的同时，对边缘用户的性能也有所提高.在独立瑞利衰落信道下，通过平均互信息的分析，从理论上证明了LDSM方案较SCMA方案有一定的信噪比增益.仿真结果证明，在远近功率差为10 dB，过载为150%时，小规模的LDSM方案和大规模LDSM方案较SCMA方案的整体用户性能分别能获得2.3 dB和2.46 dB的增益.

关键词: 非正交多址接入, 低密度叠加编码调制, 平均互信息, 远近效应, 非规则

Abstract: There may exist short cycles if the matrix dimensions of sparse code multiple access (SCMA) are small, and the regular mapping matrix of SCMA doesn't take near-far effect into consideration. Therefore, a novel uplink non-orthogonal multiple access scheme named low density superposition modulation (LDSM) scheme is proposed to construct a sparser and irregular mapping matrix. The proposed scheme can improve the overall performance and the edge users' performance for it can get diversity gain and coding gain. The analysis of the average mutual information demonstrates LDSM can get signal to noise ratio (SNR) gains over SCMA in theory. Simulation results show that when power difference is 10 dB and overloading is 150%, small dimensional and large dimensional LDSM can get 2.3 dB and 2.46 dB SNR gains over SCMA for overall performance. Both theoretic analysis and simulation results prove the performance of LDSM outperforms that of SCMA.

Key words: non-orthogonal multiple access, low density superposition modulation, average mutual information, near-far effect, irregular

中图分类号:

TN929.53

蒋成鑫, 吴湛击. 基于低密度叠加编码调制的新型上行非正交多址接入方案[J]. 北京邮电大学学报, 2018, 41(3): 14-19.

JIANG Cheng-xin, WU Zhan-ji. A Novel Low Density Superposition Modulation Scheme for Uplink NOMA[J]. JOURNAL OF BEIJING UNIVERSITY OF POSTS AND TELECOM, 2018, 41(3): 14-19.

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基于低密度叠加编码调制的新型上行非正交多址接入方案

A Novel Low Density Superposition Modulation Scheme for Uplink NOMA

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