VBR-GAM的SCMA高维度码本设计

doi:10.11959/j.issn.2096-8930.2023010

天地一体化信息网络 ›› 2023, Vol. 4 ›› Issue (1): 82-88.doi: 10.11959/j.issn.2096-8930.2023010

VBR-GAM的SCMA高维度码本设计

邓旭, 储珂, 朱立东

电子科技大学通信抗干扰技术国家级重点实验室，四川成都 611731

修回日期:2023-01-10 出版日期:2023-03-20 发布日期:2023-03-01
作者简介:邓旭（1996-），男，硕士，主要研究方向为无线与移动通信系统
储珂（2000-），女，硕士，主要研究方向为卫星通信
朱立东（1968-），男，博士，教授，主要研究方向为卫星通信、星地网络融合
基金资助:
国家自然科学基金资助项目(61871422)

SCMA High-Dimensional Codebook Design Based on VBR-GAM

Xu DENG, Ke CHU, Lidong ZHU

National Key Laboratory of Science and Technology on Communications of UESTC, Chengdu 611731, China

Revised:2023-01-10 Online:2023-03-20 Published:2023-03-01
Supported by:
The National Natural Science Foundation of China(61871422)

摘要/Abstract

摘要：

在物理层，为了解决海量用户接入问题而使用稀疏码多址接入（Sparse Code Multiple Access，SCMA）技术。现阶段有关SCMA的研究中，除了SCMA多用户检测技术的研究，还会关注SCMA系统码本设计，性能良好的SCMA码本不仅能在多用户检测过程中提升其抗噪性能，而且能够降低检测复杂度。传统的码本设计方案主要针对低维度码本进行研究，而且所设计的码本方案大部分都是基于QAM、TCM、Lattice展开的，对于高维度码本很少涉足与研究。对此主要聚焦一种新型码本设计——黄金角度调制（Golden Angle Modulation, GAM），并在此基础上提出可变比特率（Variable Bit Rate, VBR）GAM码本设计。仿真结果表明VBR-GAM码本可以灵活满足不同业务的需求，也可以通过改变调制阶数来改变不同优先级用户的功率效率，从而实现码本的变速率传输，相比传统的GAM码本性能更优，可实现更低的误码率。

关键词: 星地5G融合网络, 稀疏码多址接入, 码本设计, 黄金角度调制, VBR-GAM码本

Abstract:

At the physical layer, sparse code multiple access (SCMA) technology is used to solve the problem of massive user access.In the current research on SCMA, in addition to the research on SCMA multi-user detection technology, more attention will be paid to the design of SCMA system codebooks.SCMA codebook with good performance can not only improve its anti noise performance in the process of multi-user detection, but also reduce the detection complexity.The traditional codebook design scheme is mainly researched on low-dimensional codebooks, and most of the designed codebook schemes are based on QAM, TCM, and Lattice, while few people have set foot in and studied high-dimensional codebooks.A new codebook design - Golden Angle Modulation (GAM) was mainly focused on, and on this basis, proposed a Variable Bit Rate (VBR) GAM codebook design method.The simulation results showed that the VBR-GAM codebook could fl exibly met the needs of diff erent services.With the increased of the modulation order, the VBR-GAM codebook had better performance than the traditional GAM codebook.

Key words: integrated terrestrial-satellite 5G network, sparse code multiple access, codebook design, golden angle modulation, VBRGAM codebook

中图分类号:

TP393

邓旭, 储珂, 朱立东. VBR-GAM的SCMA高维度码本设计[J]. 天地一体化信息网络, 2023, 4(1): 82-88.

Xu DENG, Ke CHU, Lidong ZHU. SCMA High-Dimensional Codebook Design Based on VBR-GAM[J]. Space-Integrated-Ground Information Networks, 2023, 4(1): 82-88.

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码本	资源块	组1		组2		组3		星座点总数/个
码本	资源块	U1	U2	U3	U4	U5	U6	星座点总数/个
CBR	RN1	0	4	4	0	4	0	12
	RN2	4	0	4	0	0	4	12
	RN3	0	4	0	4	0	4	12
	RN4	4	0	0	4	4	0	12
VBR	RN1	0	2	4	0	8	0	14
	RN2	2	0	4	0	0	8	14
	RN3	0	2	0	4	0	8	14
	RN4	2	0	0	4	8	0	14

参数	取值
资源块数K	8块
每个用户码本的非零维数d_v	2
过载率λ	150%、200%、250%
每个资源块上复用的用户数d_f	3个
每个用户码本的非零维数d_v	2
最大迭代次数N_iter	1次、5次
信道条件	Rayleigh信道
各码本设计	CBR-GAM、VBR-GAM码本
检测算法	并行调度MPA算法

VBR-GAM的SCMA高维度码本设计

SCMA High-Dimensional Codebook Design Based on VBR-GAM

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