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Additional Diversity Gain in OFDM Systems under the Influence of IQ Imbalances  

Jin, Young-Hwan (충남대학교 전자전파정보통신공학과 이동멀티미디어통신 연구실)
Kwon, Ji-Hyeon (충남대학교 전자전파정보통신공학과 이동멀티미디어통신 연구실)
Lee, Yu-Ro (한국전자통신연구원 이동통신연구단 무선전송기술연구그룹 차세대무선LAN연구팀)
Ahn, Jae-Min (충남대학교 전자전파정보통신공학과 이동멀티미디어통신 연구실)
Publication Information
The Journal of Korean Institute of Communications and Information Sciences / v.31, no.12A, 2006 , pp. 1205-1213 More about this Journal
Abstract
In this paper, we analyze the IQ(In-phase/Quadrature) imbalance effects at both transmitter and receiver side of OFDM(Orthogonal Frequency Division Multiplexing) and show that IQ imbalance is the parameter to improve the performance using ML and OSIC scheme. Especially, we can archive the diversity gain due to the IQ imbalance in multipath fading environment. In addition, new preamble format is proposed, which enable estimation of the channel and IQ imbalance parameters to maximize the diversity gain. Significant performance improvement is achieved by using the ML(Maximum Likelihood)and OSIC(Ordered Successive Interference Cancellation) with compensation compared to a standard receiver with no compensation for IQ imbalance and proposed channel estimation scheme achieves the better performance improvement than conventional.
Keywords
IQ imbalance; OFDM; Diversity gain; Channel estimation;
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