A cooperative diversity transmission scheme by superposition coding relaying for a wireless system with multiple relays

被引：5

作者：

Liu, Yang ^{[1
]}

Man, Yi ^{[1
]}

Song, Mei ^{[1
]}

Zhang, Hongtao ^{[2
]}

Wang, Li ^{[1
]}

机构：

[1] Beijing Univ Posts & Telecommun, Sch Elect Engn, Beijing 100088, Peoples R China

[2] Beijing Univ Posts & Telecommun, Sch Informat & Commun Engn, Beijing 100088, Peoples R China

来源：

WIRELESS NETWORKS | 2015年 / 21卷 / 06期

基金：

中国国家自然科学基金;

关键词：

Cooperative diversity; Superposition coding; Relay; Power allocation; Rate; CYCLIC DELAY DIVERSITY; BROADCAST CHANNELS; LAYERED MULTICAST; ALLOCATION;

D O I：

10.1007/s11276-014-0877-9

中图分类号：

TP [自动化技术、计算机技术];

学科分类号：

0812 ;

摘要：

This paper proposes a cooperative diversity transmission scheme by superposition coding relaying (SC-relaying) for a wireless system with multiple relays. In this scheme, two layer signals, i.e., signal and , are transmitted from a base station (BS) in the first and the second time slot, while signal is also forwarded from multiple relays to a user in the second time slot. The two layer signals ( and ) meet and superimpose with each other in the air in the second time slot. Then successive interference cancellation (SIC) is used for decoding at the user. In this paper, the optimal power allocation that maximizes the sum throughput of and is first studied. Then the optimal number of selected relays and optimal transmission rate at the BS is derived. Finally the outage probability and diversity gain of the transmission of and is evaluated for system robustness. Simulation results show that the proposed scheme realizes the goal of increasing spectral efficiency and enhancing system robustness.

引用

页码：1801 / 1817

页数：17

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