Subcarrier Pairing for Amplify-and-Forward and Decode-and-Forward OFDM Relay Links

被引：109
|
作者：
Li, Yong [1 ]
Wang, Wenbo [1 ]
Kong, Jia [1 ]
Peng, Mugen [1 ]
机构：
[1] Beijing Univ Posts & Telecommun, Minist Educ, Key Lab Universal Wireless Commun, Wireless Signal Proc & Network Lab, Beijing 100876, Peoples R China
来源：
IEEE COMMUNICATIONS LETTERS | 2009年 / 13卷 / 04期
关键词：
Relay; OFDM; power allocation; POWER ALLOCATION; DIVERSITY; WIRELESS; NETWORKS;
D O I：
10.1109/LCOMM.2009.080864
中图分类号：
TN [电子技术、通信技术];
学科分类号：
0809 ;
摘要：
We consider a two-hop relay link in which orthogonal frequency division multiplexing (OFDM) is used on. both hops. Under a joint sum-power constraint, our aim is to allocate power over subcarriers on the two hops such that the instantaneous rate of the relay link is maximized. Ordered subcarrier pairing (OSP) has been proposed in the literature to further improve the relay link rate; however, the optimality of OSP has been proven only for equal power allocation and the proof of its optimality under optimal power allocation has not been available yet. In this letter, we will provide our proof which verifies that OSP is optimal for both amplify-and-forward (AF) and decode-and-forward (DF) relay links when optimal power allocation is applied.
引用
收藏
页码：209 / 211
页数：3
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