瑞利衰落信道下SCMA码本设计

doi:10.11959/j.issn.1000-436x.2022064

通信学报 ›› 2022, Vol. 43 ›› Issue (4): 107-113.doi: 10.11959/j.issn.1000-436x.2022064

瑞利衰落信道下SCMA码本设计

雷拓峰¹^,², 倪淑燕², 程乃平², 宋鑫¹^,²

¹ 航天工程大学研究生院，北京 101416
² 航天工程大学电子与光学工程系，北京 101416

修回日期:2022-03-17 出版日期:2022-04-25 发布日期:2022-04-01
作者简介:雷拓峰（1998- ），男，陕西咸阳人，航天工程大学博士生，主要研究方向为非正交多址技术、衰落信道码字设计、启发式优化算法
倪淑燕（1981- ），女，河北邢台人，博士，航天工程大学副教授，主要研究方向为通信与信息系统
程乃平（1963- ），男，陕西咸阳人，博士，航天工程大学教授、博士生导师，主要研究方向为飞行器测控通信
宋鑫（1995- ），男，山西临汾人，航天工程大学博士生，主要研究方向为信道编码技术
基金资助:
国家自然科学基金资助项目(61805283)

SCMA codebooks design for Rayleigh fading channel

Tuofeng LEI¹^,², Shuyan NI², Naiping CHENG², Xin SONG¹^,²

¹ Company of Postgraduate Management, Space Engineering University, Beijing 101416, China
² Department of Electronic and Optical Engineering, Space Engineering University, Beijing 101416, China

Revised:2022-03-17 Online:2022-04-25 Published:2022-04-01
Supported by:
The National Natural Science Foundation of China(61805283)

摘要/Abstract

摘要：

为了设计近似最优的稀疏码本，以多用户叠加星座点的误符号率性能为评价指标，分别针对上行、下行传输信道，设计了适用于瑞利衰落信道的近似最优稀疏码本。基于叠加星座点与误符号率的数学模型，提出了一种近似最优稀疏码本的设计方案，码本的设计步骤包括因子图矩阵的设计、码字对的匹配以及最优旋转角度的确定。仿真结果表明，所提码本设计方案能够达到近似最优的误符号率性能。

关键词: 稀疏码分多址, 近似最优码本, 瑞利衰落信道, 误符号率

Abstract:

According to the symbol error eate (SER) of the superimposed constellation, the near-optimal space code multiple access (SCMA) codebooks were explored under uplink and downlink Rayleigh fading channels, respectively.A near-optimal codebook design scheme was proposed based on the mathematical model between the superimposed constellation and the SER formula.And the proposed design procedures could be summarized as follows, design the factor graph matrix, match the best codeword pair, and find the optimal angle.Numerical results are provided to demonstrate that the proposed scheme can achieve near-optimal SER performance.

Key words: sparse code multiple access, near-optimal codebook, Rayleigh fading channel, symbol error rate

中图分类号:

TN914.5

雷拓峰, 倪淑燕, 程乃平, 宋鑫. 瑞利衰落信道下SCMA码本设计[J]. 通信学报, 2022, 43(4): 107-113.

Tuofeng LEI, Shuyan NI, Naiping CHENG, Xin SONG. SCMA codebooks design for Rayleigh fading channel[J]. Journal on Communications, 2022, 43(4): 107-113.

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参考文献 19

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参数	值
频率数目K	4
用户数目L	6
调制阶数M	4（QPSK）
用户节点度数d_v	2
频率节点度数d_f	3
信道模型	瑞利衰落信道
解码算法	MPA
帧长度/bit	100
仿真次数/次	10 000

瑞利衰落信道下SCMA码本设计

SCMA codebooks design for Rayleigh fading channel

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