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Multi-antenna Subcarrier Allocation Using Zero-Forcing Beamforming in MIMO-OFDM Systems  

Shin, Young-Il (KT 인프라연구소 무선인터넷개발)
Kang, Tae-Sung (한국과학기술원 전자전산학과 통신신호처리연구실)
Kim, Hyung-Myung (한국과학기술원 전자전산학과 통신신호처리연구실)
Publication Information
The Journal of Korean Institute of Communications and Information Sciences / v.32, no.10A, 2007 , pp. 974-983 More about this Journal
Abstract
In this paper, a low complexity subcarrier allocation scheme is proposed for multiuser MIMO-OFDM systems with zero-forcing beamformer (ZFBF) so that the total transmit power can be minimized satisfying given target data rate. Since the optimal method requires very high computational complexity, we propose a low complextiy suboptimal method. Using the fact that the effective channel gain is proportional to the orthogonallity of channels of multiplexed users, a user set with the highest orthogonality of channel among users is assigned to each subcarrier in order to minimize required transmit power. The numerical results show that the proposed suboptimal method can reduce computational complexity with little performance loss.
Keywords
MIMO; OFDM; Zero-forcing beamformer; Subcarrier Allocation;
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