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Performance Improvement of STBC-OFDM System with Advanced Transmit Diversity in Mobile Communications Environment  

김장욱 (동양공업전문대학 전자과)
양희진 (쏠리테)
오창헌 (한국기술교육대학교 정보기술공학)
조성준 (한국항공대학교 전자·정보통신·컴퓨터공학부)
Publication Information
The Journal of Korean Institute of Electromagnetic Engineering and Science / v.15, no.5, 2004 , pp. 444-450 More about this Journal
Abstract
In mobile communications environment, STBC-OFDM(Space Time Block Code-Orthogonal Frequency Division Multiplexing) system with transmit diversity obtains the MRRC(Maximal Ratio Receiver Combining) diversity gain in time-invariant channel between two received symbols. But in time-variant channel, due to the interference between received symbols, MRRC diversity gain cant be obtained. So, when the mobile device with transmit diversity moves in high speed, the scheme to reduce the performance degradation due to the interference is needed. In this paper, we propose the receiver architecture with advanced transmit diversity, which improves the performance of STBC-OFDM system. The proposed architecture obtains the diversity gain without the change of transmit bandwidth at the receiver with the interference canceller using ZF(Zero Forcing) algorithm. Simulation results show performance improvement as doppler shift is increasing.
Keywords
Transmit Diversity; STBC; OFDM; Time Selective Fading Channel; Zero Forcing;
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