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Channel Prediction based Adaptive Channel Tracking cheme in MIMO-OFDM Systems with Null Sub-carriers  

Jeon, Hyoung-Goo (동의대학교 정보통신공학과)
Publication Information
The Journal of Korean Institute of Communications and Information Sciences / v.32, no.5C, 2007 , pp. 556-564 More about this Journal
Abstract
This paper proposes an efficient scheme to track a time variant channel induced by multi-path Rayleigh fading in mobile MIMO-OFDM systems with null sub-carriers. The proposed adaptive channel tracking scheme removes in the frequency domain the interfering signals of the other transmit (Tx) antennas by using a predicted channel frequency response before starting the channel estimation. Time domain channel estimation is then performed to reduce the additive white Gaussian noise (AWGN). The simulation results show that the proposed method is better than the conventional channel tracking method [3] in time varying channel environments. At a Doppler frequency of 300 Hz and bit error rates (BER) of 10-3, signal-to-noise power ratio (Eb/N0) gains of about 2.5 dB are achieved relative to the conventional channel tracking method [3]. At a Doppler frequency of 600 Hz, the performance difference between the proposed method and conventional one becomes much larger.
Keywords
MIMO; Channel Estimation; Channel Tracking; Prediction; Null Sub-Carriers;
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