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

Abstract

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

CLC Number:

TN92

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.

Figures/Tables 11

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

References 21

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