Performance Improvement of Channel Estimation based on Time-domain Threshold for OFDM Systems 


Vol. 33,  No. 9, pp. 720-724, Sep.  2008


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  Abstract

Channel estimation in OFDM systems is usually carried out in frequency domain based on the least-squares (LS) method and the minimum mean-square error (MMSE) method with known pilot symbols. The LS estimator has a merit of low complexity but may suffer from the noise because it does not consider any noise effect in obtaining its solution. To enhance the noise immunity of the LS estimator, we consider estimation noise in time domain. Residual noise existing at the estimated channel coefficients in time domain could be reduced by reasonable selection of a threshold value. To achieve this, we propose a channel-estimation method based on a time-domain threshold which is a standard deviation of noise obtained by wavelet decomposition. Computer simulation shows that the estimation performance of the proposed method approaches to that of the known-channel case in terms of bit-error rates after the Viterbi decoder in overall SNRs.

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  Cite this article

[IEEE Style]

Y. Lee and H. Kim, "Performance Improvement of Channel Estimation based on Time-domain Threshold for OFDM Systems," The Journal of Korean Institute of Communications and Information Sciences, vol. 33, no. 9, pp. 720-724, 2008. DOI: .

[ACM Style]

You-Seok Lee and Hyoung-Nam Kim. 2008. Performance Improvement of Channel Estimation based on Time-domain Threshold for OFDM Systems. The Journal of Korean Institute of Communications and Information Sciences, 33, 9, (2008), 720-724. DOI: .

[KICS Style]

You-Seok Lee and Hyoung-Nam Kim, "Performance Improvement of Channel Estimation based on Time-domain Threshold for OFDM Systems," The Journal of Korean Institute of Communications and Information Sciences, vol. 33, no. 9, pp. 720-724, 9. 2008.

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pISSN : 1226 - 4717
eISSN : 2287 - 3880