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首页> 外文期刊>Wireless Communications Letters, IEEE >A Fast Convergence Multiuser Detection Scheme for Uplink SCMA Systems
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A Fast Convergence Multiuser Detection Scheme for Uplink SCMA Systems

机译:上行SCMA系统的快速收敛多用户检测方案

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摘要

Sparse code multiple access (SCMA) is a competitive non-orthogonal multiple access technique for fifth generation wireless communication networks which can accommodate massive connectivity. Among the existing multiuser detection schemes for uplink (UP) SCMA systems, the asynchronous message passing algorithm (ASYN-MPA) scheme, where messages are updated sequentially, generally converges faster than the synchronous variant, where all messages are updated in parallel manner. Nevertheless, the specific pre-defined order of the ASYN-MPA scheme is not always the best option. In this letter, we tackle the problem of how to schedule message for the ASYN-MPA scheme that results in the best convergence rate. Specifically, a novel residual-aided message propagation approach for scheduling messages in the ASYN-MPA scheme, termed residual-aided MPA, is proposed for UP SCMA systems, which exploits the dynamic selection of the message which has the largest residual. Simulations show that the proposed scheme with two iterations provides very similar bit error rate performance to the existing multiuser detection schemes with six iterations (only less than 0.05 dB degradation), whose complexity is reduced substantially.
机译:稀疏代码多路访问(SCMA)是一种竞争性的非正交多路访问技术,适用于可以容纳大量连接的第五代无线通信网络。在用于上行链路(UP)SCMA系统的现有多用户检测方案中,异步消息传递算法(ASYN-MPA)方案(按顺序更新消息)通常收敛得比同步变量快,后者以并行方式更新所有消息。但是,ASYN-MPA方案的特定预定义顺序并不总是最佳选择。在这封信中,我们解决了如何为ASYN-MPA计划安排消息,以实现最佳收敛速度的问题。具体来说,针对UP SCMA系统,提出了一种新的用于在ASYN-MPA方案中调度消息的残差辅助消息传播方法,称为残差辅助MPA,该方法利用了残差最大的消息的动态选择。仿真表明,所提出的具有两次迭代的方案与具有六次迭代的现有多用户检测方案相比,提供了非常相似的误码率性能(仅降低了0.05 dB),其复杂度大大降低了。

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