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Transmit Power and Subcarrier Allocation Schemes for Downlink OFDM Systems with Multiple Relays  

Je, Hui-Won (스탠포드대학교 전기공학과)
Kim, Ik-Hyun (삼성전자 Telecommunication & Network 시스템 연구실)
Lee, Kwang-Bok (서울대학교 전기컴퓨터공학뷰 뉴미디어통신공동연구소(INMC) 이동통신 연구실)
Publication Information
The Journal of Korean Institute of Communications and Information Sciences / v.34, no.3A, 2009 , pp. 281-289 More about this Journal
Abstract
Wireless relay attracts great attention as a core technology of next generation wireless communication systems since it enables reliable communications and extends cell coverage by supporting shadowed users. In this paper, we Propose transmit power and subcarrier allocation scheme for downlink OFDM systems with multiple decode and forward (DF) relays to increase data rate with fixed bit error rate (BER) and sum power constraint. In simulation results, average data rate based on the proposed schemes are evaluated and compared to that of the other schemes. It is also shown that the performance loss of the proposed scheme is negligible compared to the optimal scheme, while its computational complexity is reduced considerably.
Keywords
Relay; OFDM; power allocation; subcarrier allocation; Hungarian algorithm;
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