Low Complexity Receiver for Uplink SCMA System via Expectation Propagation
Low Complexity Receiver for Uplink SCMA System via Expectation Propagation
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DOI：
10.1109/wcnc.2017.7925590
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发表时间：
2017-01
期刊：
影响因子：
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通讯作者：
Xiangming Meng;Yiqun Wu;Yan Chen;M. Cheng
中科院分区：
文献类型：
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作者：
Xiangming Meng;Yiqun Wu;Yan Chen;M. Cheng
稀疏码多址接入（Sparse Code Multiple Access，SCMA）技术被认为是未来第五代（Fifth Generation，5G）通信中一种很有前途的非正交多址接入技术。由于稀疏的性质，消息传递算法（MPA）已被用于在接收机实现接近最大似然（ML）检测性能，具有低得多的复杂度。然而，MPA的复杂度顺序仍然与码本的大小和给定资源元素上的信号叠加程度成指数关系。本文提出了一种新的基于期望传播算法（EPA）的低复杂度迭代接收机，它将复杂度从指数阶降低到线性阶。仿真结果表明，所提出的EPA接收机实现了与传统消息传递算法（MPA）接收机几乎相同的误块率（BLER）性能，但复杂度较低。
Sparse code multiple access (SCMA) scheme is considered to be one promising non-orthogonal multiple access technology for the future fifth generation (5G) communications. Due to the sparse nature, message passing algorithm (MPA) has been used at the receiver to achieve close to maximum likelihood (ML) detection performance with much lower complexity. However, the complexity order of MPA is still exponential with the size of codebook and the degree of signal superposition on a given resource element. In this paper, we propose a novel low complexity iterative receiver based on expectation propagation algorithm (EPA), which reduces the complexity order from exponential to linear. Simulation results demonstrate that the proposed EPA receiver achieves nearly the same block error rate (BLER) performance as the conventional message passing algorithm (MPA) receiver with orders less complexity.