Random Spreading With Higher Order Modulation in Unsourced Random Access

IF 3.7 3区计算机科学 Q2 TELECOMMUNICATIONS

IEEE Communications Letters Pub Date : 2025-02-21 DOI:10.1109/LCOMM.2025.3544250

Jian Dang;Zaichen Zhang;Yongpeng Wu

引用次数: 0

Abstract

Unsourced random access (URA) is crucial for future massive access scenarios. Existing URA schemes often use low-order modulation and assess performance with a limited number of active users. This work presents a pilot-free URA scheme that employs random spreading and higher-order modulation. We derive a discrete mixture generalized approximate message passing algorithm to enhance active user detection (AUD) and data detection. Simulations show that our proposed method significantly outperforms pilot-based methods in AUD, and higher-order modulation supports a large number of active users while ensuring the target per user probability of error (PUPE) performance.

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无源随机接入中高阶调制的随机扩展

无源随机访问（URA）对于未来的大规模访问场景至关重要。市建局现有的方案通常采用低阶调制，并在有限的活跃用户数量下评估性能。本研究提出了一种采用随机扩频和高阶调制的无试验URA方案。提出了一种离散混合广义近似消息传递算法，以增强主动用户检测和数据检测。仿真表明，我们提出的方法在AUD方面明显优于基于导频的方法，并且高阶调制支持大量活跃用户，同时确保目标每用户误差概率（PUPE）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。

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来源期刊

IEEE Communications Letters 工程技术-电信学

CiteScore

8.10

自引率

7.30%

发文量

590

审稿时长

2.8 months

期刊介绍： The IEEE Communications Letters publishes short papers in a rapid publication cycle on advances in the state-of-the-art of communication over different media and channels including wire, underground, waveguide, optical fiber, and storage channels. Both theoretical contributions (including new techniques, concepts, and analyses) and practical contributions (including system experiments and prototypes, and new applications) are encouraged. This journal focuses on the physical layer and the link layer of communication systems.