基于广义近似消息传递的扰码多址卫星接收技术

doi:10.11959/j.issn.1000-0801.2022077

电信科学 ›› 2022, Vol. 38 ›› Issue (4): 77-89.doi: 10.11959/j.issn.1000-0801.2022077

基于广义近似消息传递的扰码多址卫星接收技术

余乐¹, 朱立东¹, 金亮², 李佳立², 刘轶伦¹, 郭晟¹

¹ 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
² 航天恒星科技有限公司，北京 100095

修回日期:2022-04-10 出版日期:2022-04-20 发布日期:2022-04-01
作者简介:余乐（1996− ），男，电子科技大学硕士生，主要研究方向为卫星物联网接入、抗干扰通信
朱立东（1968− ），男，电子科技大学教授、博士生导师，主要研究方向为卫星通信、天地网络融合、通信信号处理等
金亮（1986− ），男，航天恒星科技有限公司高级工程师，主要研究方向为高低轨卫星通信地面系统
李佳立（1988− ），女，航天恒星科技有限公司工程师，主要研究方向为卫星通信系统网络设计
刘轶伦（1996− ），男，电子科技大学博士生，主要研究方向为卫星抗干扰通信
郭晟（1999− ），女，电子科技大学硕士生，主要研究方向为卫星通信、抗干扰通信

Generalized approximate message passing based SrCMA satellite receiver

Le YU¹, Lidong ZHU¹, Liang JIN², Jiali LI², Yilun LIU¹, Cheng GUO¹

¹ National Key Laboratory of Science and Technology on Communication, University of Electronic Science and Technology of China, Chengdu 611731, China
² Space Star Technology Co., Ltd., Beijing 100095, China

Revised:2022-04-10 Online:2022-04-20 Published:2022-04-01

摘要/Abstract

摘要：

为了解决卫星互联网中各类终端设备对传输速率和频谱资源的需求剧增问题，针对非正交多址卫星互联网，设计了一种基于广义近似消息传递的优化卫星接收机。考虑非正交多址中的多用户检测，基于图模型建立因子图，利用因子图建立系统的消息传递模型并提出消息传递算法。基于广义近似消息传递算法，进一步降低传统基于消息传递的多用户检测器的复杂度。在卫星环境下，研究广义近似消息传递信号接收性能。仿真结果表明，所提算法能有效地解决星地之间的多用户信号共存问题，同时降低算法的运算复杂度。

关键词: 卫星互联网, 非正交多址接入, 扰码多址, 广义近似消息传递, 多用户检测

Abstract:

In order to satisfy the requirements of the transmission rate and spectrum resource for various terminals and equipment in the satellite internet, a generalized approximation-based message passing optimization satellite receiver was designed.Considering the multi-user detection in the satellite network using the non-orthogonal multiple access, a factor graph was established based on the graph model, and the factor graph was used to analyze the message passing model of the system and a message passing algorithm was proposed.Based on the generalized approximate message passing method, the complexity of the traditional multi-user detector based on message passing was further reduced.Under satellite channel condition, generalized approximate messaging satellite receivers were studied.The simulation results show that the proposed algorithm can effectively solve the signal coexistence problem of multi-users, and reduce the computational complexity of the algorithm.

Key words: satellite internet, non-orthogonal multiple access, SrCMA, generalized approximate message passing, multi-user detection

中图分类号:

TN92

余乐, 朱立东, 金亮, 李佳立, 刘轶伦, 郭晟. 基于广义近似消息传递的扰码多址卫星接收技术[J]. 电信科学, 2022, 38(4): 77-89.

Le YU, Lidong ZHU, Liang JIN, Jiali LI, Yilun LIU, Cheng GUO. Generalized approximate message passing based SrCMA satellite receiver[J]. Telecommunications Science, 2022, 38(4): 77-89.

图/表 11

图1

表1

系统参数"

参数	含义
U	用户数量
$H$	信道矩阵
h	信道系数
N	符号信息总长度
K	数据信息长度
N	第n个符号
k	第k个数据
u	第u个用户
u'	除第u个用户以外的用户
w	高斯白噪声
σ	高斯白噪声标准差
d	用户发送的数据
c	编码后的序列
x	调制后的符号
S/S^-1	加扰器/解扰器
ζ	干扰聚合项
f	函数节点
y	不含噪声的用户数据叠加信号
t	迭代次数
Z	归一化系数
Δ	对数化概率消息
g_f	从函数节点到因子节点信息聚合项
$τ_{f}^{g}$	从函数节点到因子节点信息扰动项
s	输出标量值
$τ_{f}^{s}$	输出标量的扰动值
r	输入标量值
τ^r	输入标量扰动值

表1

图2

图3

图4

图5

图6

图7

图8

图9

图10

参考文献 21

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基于广义近似消息传递的扰码多址卫星接收技术

Generalized approximate message passing based SrCMA satellite receiver

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