RIPDMA系统低复杂度接收机设计
首发时间:2021-12-15
摘要:作为最有前景的非正交多址接入技术之一,图样分割多址接入技术(PDMA)以其支持更多的接入用户数和更高的频谱速率成为满足5G海量接入用户需求的核心技术之一。PDMA发送机接收机的联合设计是实现PDMA系统性能的关键,传统的PDMA系统在发送端借助图样分割矩阵最大化发挥PDMA的稀疏特性,提高接入用户数,在接收机端采用串行干扰删除(SIC)多用户检测的方式,近年来也有基于迭代检测译码(IDD)、置信传播算法(BP)的接收机模型,在一定程度上改善了系统的性能,但是接收机算法复杂度过高的情况,严重影响了PDMA系统整体性能。本文在PDMA系统的发送机端引入了随机交织器,在接收机端采用期望传播(EP)算法。文章给出了RIPDMA系统低复杂度接收机的模型,详细分析了采用EP算法的接收机结构。仿真结果验证RIPDMA低复杂度接收机模型能够保证系统性能且算法复杂度有指数级的降低。
关键词: 通信与信息系统 图样分割多址接入技术 随机交织器 期望传播算法 联合优化。
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Design of low complexity receiver for RIPDMA system
Abstract:As one of the most promising non-orthogonal multiple access technologies, pattern division multiple access (PDMA) has become one of the core technologies to meet the requirements of 5G mass access users because of its support for more users and higher frequency spectrum rate. The joint design of PDMA transmitter and receiver is the key to realize the performance of PDMA system. The traditional PDMA system maximizes the sparse characteristics of PDMA with the help of pattern division matrix at the transmitter to increase the number of access users, and adopts successive interference cancellation (SIC) multi-user detection at the receiver. In recent years, there are also receiver based on iterative detection decoding (IDD) and Belief Propagation algorithm (BP), which improve the performance of the system to a certain extent. However, the high complexity of the receiver algorithm seriously affects the performance of PDMA system. In this paper, a random interleaver is introduced at the transmitter of PDMA system, and the expectation propagation (EP) algorithm is adopted at the receiver. In this paper, the low complexity receiver model of RIPDMA system is presented, and the receiver using EP algorithm is analyzed in detail. Simulation results verify that RIPDMA low complexity receiver model can guarantee system performance and the algorithm complexity is reduced exponentially.
Keywords: Communication and information systems;PDMA RI,EP Joint optimization.
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