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Erasure Correcting Blind Detection in Unsourced Random Access for Grant-Free Massive Connections

IEEE TRANSACTIONS ON WIRELESS COMMUNICATIONS(2024)

Seoul Natl Univ SNU

Cited 0|Views20
Abstract
The requirement for massive connectivity in 5G and beyond 5G systems pose new challenges to random access protocol design. As a promising technique to afford massive short packet connections, unsourced random access (URA) gains traction. However, the existing URA schemes were developed for static channels and not implementable in fast fading channels. In this paper, we propose a novel URA strategy tailored to time-varying Rayleigh fading channels when the system loads and instantaneous channels are unknown to the receiver. With a time slotted transmission framework, we devise a low-complexity error correcting code and a decoding algorithm leveraging successive interference cancellation (SIC). The receiver corrects errors across slots by using SIC to decode the transmitted messages from highly interfering superposed signals. The asymptotic error rate is derived and a trade-off between the minimum required energy required for reliable communication and the user density is analyzed. Our simulation results verify that the proposed scheme achieves a near-optimal energy efficiency performance when the system load is in the moderate system load regime and a significant performance gain over the existing URA schemes in time varying fading channels.
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Unsourced random access,blind receiver,forward error correction,successive interference cancellation,approximate message passing
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要点】:本文提出了一种适用于时变Rayleigh衰落信道的无源随机接入(URA)策略,通过利用时间槽传输框架和低复杂度错误纠正码以及基于连续干扰消除(SIC)的解码算法,实现了在接收端未知系统负载和瞬时信道条件下的错误纠正盲检测。

方法】:研究设计了一种新颖的错误纠正码和基于SIC的解码算法,能够在高度干扰的叠加信号中解码传输的信息。

实验】:通过仿真实验,使用自定义的数据集验证了所提策略在中等系统负载条件下能够实现近最优的能量效率性能,并在时变衰落信道中相比现有URA方案有显著性能提升。