On Power Allocation for Dual-Hop Amplify-and-Forward OFDM Relay Systems

被引：5
作者：
Saito, Masato [1 ]
Athaudage, Chandra R. N. [2 ]
Evans, Jamie [2 ]
机构：
[1] Nara Inst Sci & Technol NAIST, Grad Sch Informat Sci, Nara, Japan
[2] Univ Melbourne, Dept Elect & Elect Engn, CUBIN, Melbourne, Vic 3010, Australia
来源：
GLOBECOM 2008 - 2008 IEEE GLOBAL TELECOMMUNICATIONS CONFERENCE | 2008年
关键词：
D O I：
10.1109/GLOCOM.2008.ECP.789
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：
The solutions to an optimal power allocation problem in dual-hop amplify-and-forward (non-regenerative) OFDM relay systems over given channel gains are provided with a joint transmit power constraint. We analytically derive the allocated power to each hop/subcarrier that satisfies the Karush-Kuhn-Tucker (KKT) conditions by solving simultaneous equations. The solutions imply that at most 3(N) - 1 possible power allocation candidates could exist on both source and relay nodes satisfying KKT conditions when N is the number of subcarriers. Based on the solution, a sub-optimal power allocation method that selects only significant allocated power in strong subcarriers is proposed and achieves higher capacity (achievable rate) than conventional sub-optimal methods. As for the feasibility, the number of candidates to be evaluated is N in the proposed method.
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页数：6
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