Subcarrier Power Allocation in OFDM Multi-Hop Relaying System

LI Jianing, GUAN Lei, ZHANG Jianhua, LI Xiaofan, ZHANG Ping
JOURNAL OF BEIJING UNIVERSITY OF POSTS AND TELECOM, 2008 ( Vol.31 No.2 )
DOI:
Publish Year: 2008, content in Simplified Chinese

Abstract: Subcarrier power allocation in broadband orthogonal frequency division multiplexing(OFDM) relaying system is addressed for the nonregenerative and regenerative relaying mode. Firstly, based on the two-hop nonregenerative relaying system, an equivalent channel gain model for the two-hop regenerative relaying system is induced. Afterwards, the overall transmit power is allocated to the subcarrier pairs using water-filling approach. Finally, the above conclusions are generalized to the multi-hop relaying system. Simulation shows that the proposed power allocation algorithm can achieve a higher system capacity than both the direct transmission system and uniform power allocation scheme, and the multi-hop relaying system can efficiently enlarge the coverage.

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