Journal of Beijing University of Posts and Telecommunications

  • EI核心期刊

JOURNAL OF BEIJING UNIVERSITY OF POSTS AND TELECOM ›› 2008, Vol. 31 ›› Issue (2): 59-63.doi: 10.13190/jbupt.200802.59.099

• Papers • Previous Articles     Next Articles

Subcarrier Power Allocation in OFDM Multi-Hop Relaying System

LI Jia-ning, GUAN Lei, ZHANG Jian-hua, LI Xiao-fan, ZHANG Ping   

  1. School of Telecommunication Engineering, Beijing University of Posts and Telecommunications, Beijing 100876, China
  • Received:2007-06-11 Revised:1900-01-01 Online:2008-04-28 Published:2008-04-28
  • Contact: LI Jia-ning

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.

Key words: cooperative transmission, power allocation, subcarrier pair, equivalent channel gain

CLC Number: