异步无赠予无速率多路访问的活动和数据联合检测方案

Wei Zhang, Xiaofeng Zhong, Shidong Zhou
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引用次数: 0

摘要

本文考虑了帧异步免授权无鼠率多址接入(FA-GF-RMA)方案,用户可在任何符号时间启动接入,利用共享信道资源向基站传输数据。为了提高系统的可靠性,引入了无鼠率编码。以往的文献表明,FA-GF-RMA 比帧同步免授权无鼠率多址接入(FS-GF-RMA)能获得更低的接入延迟,而且无鼠率编码能带来极高的可靠性。为了在更实际的场景中支持 FA-GF-RMA,提出了一种联合活动和数据检测(JADD)方案。利用零星流量的特点,近似信息传递(AMP)被用于传输信号矩阵估计。然后,为了确定数据包起始点,根据恢复的传输信号,利用编码中的内在功率模式,解决最大后验概率(MAP)估计问题。为提高 AMP 的估计性能,设计了一种迭代功率模式辅助 AMP 算法。仿真结果验证了所提出的解决方案实现了与 FA-GF-RMA 性能极限相当的延迟性能。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
A joint activity and data detection scheme for asynchronous grant-free rateless multiple access
This paper considers the frame-asynchronous grant-free rateless multiple access (FA-GF-RMA) scenario, where users can initiate access at any symbol time, using shared channel resources to transmit data to the base station. Rateless coding is introduced to enhance the reliability of the system. Previous literature has shown that FA-GF-RMA can achieve lower access delay than frame-synchronous grant-free rateless multiple access (FS-GF-RMA), with extreme reliability enabled by rateless coding. To support FA-GF-RMA in more practical scenarios, a joint activity and data detection (JADD) scheme is proposed. Exploiting the feature of sporadic traffic, approximate message passing (AMP) is exploited for transmission signal matrix estimation. Then, to determine the packet start points, a maximum posterior probability (MAP) estimation problem is solved based on the recovered transmitted signals, leveraging the intrinsic power pattern in the codeword. An iterative power-pattern-aided AMP algorithm is devised to enhance the estimation performance of AMP. Simulation results verify that the proposed solution achieves a delay performance that is comparable to the performance limit of FA-GF-RMA.
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