On the Design of Repetition-Based Slotted ALOHA Operated With q-Ary Compute-Forward

被引：0

作者：

Yang, Tao ^{[1
]}

Xi, Zhiyu ^{[1
]}

Ren, Wencheng ^{[1
]}

Yu, Fangtao ^{[1
]}

机构：

[1] Beihang Univ, Beijing 100191, Peoples R China

来源：

IEEE TRANSACTIONS ON VEHICULAR TECHNOLOGY | 2024年 / 73卷 / 10期

基金：

国家重点研发计划; 中国国家自然科学基金; 北京市自然科学基金;

关键词：

Receivers; Wireless communication; Throughput; Streams; Codes; Protocols; Multiuser detection; mMTC; Slotted ALOHA; NOMA; grant-free random access; compute-forward; physical-layer network coding; CHANNELS; ACCESS;

D O I：

10.1109/TVT.2023.3335367

中图分类号：

TM [电工技术]; TN [电子技术、通信技术];

学科分类号：

0808 ; 0809 ;

摘要：

This correspondence studies slotted ALOHA (SA) operated with q-ary compute-forward (CF) for grant-free random access. At the transmitters, a practical q-ary channel code and repetition SA (RSA) protocol are utilized, where users send replicas of their coded-modulated packets in randomly selected slots. At the receiver, practical q-ary linear physical-layer network coding is employed to compute and stores a number of network-coding (NC) message streams per slot. Upon collecting a sufficient amount of NC message streams from a number of consecutive slots, the receiver carries out generalized matrix inversion (GMI) to recover the users' messages. We demonstrate that the developed scheme exhibits dramatically increased throughput by as much as 80%. Furthermore, thanks to GMI, there is no need to wait till the end of the frame for decoding, leading to slashed processing delay in RSA.

引用

页码：15675 / 15680

页数：6