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Performance Improvement of LMMSE Channel Estimation Method for OFDM Systems  

Kang, Yeon-Seok (경희대학교 전파공학과 무선통신 및 SDR 연구실)
Kim, Young-Soo (경희대학교 전자정보대학)
Suh, Doug-Young (경희대학교 전자정보대학)
Kim, Jin-Sang (경희대학교 전자정보대학)
Publication Information
The Journal of Korean Institute of Communications and Information Sciences / v.30, no.2A, 2005 , pp. 43-50 More about this Journal
Abstract
In this paper, we present an improved channel estimation method for orthogonal frequency division multipexing systems using pilot symbol assisted modulation(PSAM). Conventional linear minimum mean square error(LMMSE) channel estimation method uses only pilot symbols for channel estimation. So, as the fading channel varies rapidly, the system performance is degraded. The basic idea of the proposed scheme is that we firstly estimate channel coefficients at the middle point between two pilot symbols and then compute the channel attenuation by using LMMSE method. Superior performance achieved with the proposed method is illustrated by simulation experiments with the Doppler frequency of 36Hz and 185Hz in comparison with conventional LMMSE channel estimator.
Keywords
OFDM; LMMSE channel estimation; Rapid fading Channel;
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