作者
Weijie Yuan, Nan Wu, Qinghua Guo, Yonghui Li, Chengwen Xing, Jingming Kuang
发表日期
2018/3/14
期刊
IEEE Transactions on Wireless Communications
卷号
17
期号
5
页码范围
3444-3458
出版商
IEEE
简介
The rapid development of mobile communications requires even higher spectral efficiency. Non-orthogonal multiple access (NOMA) has emerged as a promising technology to further increase the access efficiency of wireless networks. Among several NOMA schemes, it has been shown that sparse code multiple access (SCMA) is able to achieve better performance. In this paper, we consider a downlink MIMO-SCMA system over frequency selective fading channels. For optimal detection, the complexity increases exponentially with the product of the number of users, the number of antennas and the channel length. To tackle this challenge, we propose near optimal low-complexity iterative receivers based on factor graph. By introducing auxiliary variables, a stretched factor graph is constructed and a hybrid belief propagation (BP) and expectation propagation (EP) receiver, named stretch-BP-EP, is proposed …
学术搜索中的文章
W Yuan, N Wu, Q Guo, Y Li, C Xing, J Kuang - IEEE Transactions on Wireless Communications, 2018