Two-Step User Pairing for OFDM-Based Cooperative NOMA Systems

被引：9

作者：

Cheng, Yanyu ^{[1
]}

Li, Kwok Hung ^{[1
]}

Teh, Kah Chan ^{[1
]}

Luo, Sheng ^{[2
]}

Wang, Wei ^{[3
]}

机构：

[1] Nanyang Technol Univ, Sch Elect & Elect Engn, Singapore 639798, Singapore

[2] Shenzhen Univ, Coll Comp Sci & Software Engn, Shenzhen 518060, Peoples R China

[3] Nanjing Univ Aeronaut & Astronaut, Coll Elect & Informat Engn, Nanjing 211106, Peoples R China

来源：

IEEE COMMUNICATIONS LETTERS | 2020年 / 24卷 / 04期

关键词：

Cooperative NOMA; OFDM; user pairing; outage probability; diversity gain; NONORTHOGONAL MULTIPLE-ACCESS;

D O I：

10.1109/LCOMM.2020.2964665

中图分类号：

TN [电子技术、通信技术];

学科分类号：

0809 ;

摘要：

In this letter, we propose a two-step user-paring scheme for an orthogonal frequency-division multiplexing (OFDM)-based cooperative non-orthogonal multiple-access (NOMA) system where far users cannot communicate with the base station directly. The first step is for allocating near users, and the second step is for allocating far users. To evaluate the performance of the proposed scheme, we derive the closed-form expression for the upper bound of the outage probability, and then obtain the achievable diversity gain. Numerical results show that the proposed scheme can achieve the optimal diversity gain confirmed by exhaustive search.

引用

页码：903 / 906

页数：4

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