Joint Optimization Scheme for Power Allocation and Subcarrier Pairing in OFDM-Based Multi-Relay Networks

被引：14
|
作者：
Zhou, Zhikang [1 ]
Zhu, Qi [1 ]
机构：
[1] Nanjing Univ Posts & Telecommun, Key Wireless Lab Jiangsu Prov, Sch Telecommun & Informat Engn, Nanjing 210003, Peoples R China
来源：
IEEE COMMUNICATIONS LETTERS | 2014年 / 18卷 / 06期
基金：
中国国家自然科学基金;
关键词：
Orthogonal frequency division multiplexing (OFDM); power allocation (PA); subcarrier pairing; multi-relay; cooperative networks; RESOURCE-ALLOCATION; SYSTEMS;
D O I：
10.1109/LCOMM.2014.2319256
中图分类号：
TN [电子技术、通信技术];
学科分类号：
0809 ;
摘要：
We consider an OFDM-based multi-relay network in this letter, where a certain subcarrier pair can be forwarded by the source node and multiple relays to provide space diversity. A joint optimization scheme for power allocation (PA) and subcarrier pairing (SP) is proposed to maximize the total end-to-end transmission rate under a total power constraint. The optimization problem is simplified by introducing the definition of equivalent channel gain, and a new PA scheme based on the Cauchy-Schwarz inequality is provided in this letter. Then a suboptimal scheme, which can provide similar performance with lower computation complexity, is proposed. Simulation results show that the proposed schemes outperform other schemes with or without space diversity.
引用
收藏
页码：1039 / 1042
页数：4
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