Journal
IEEE TRANSACTIONS ON COMMUNICATIONS
Volume 48, Issue 7, Pages 1226-1235Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/26.855530
Keywords
adaptive equalizers; intersymbol interference; minimum mean-squared error (MMSE) equalization
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We consider the design and adaptation of a linear equalizer with a finite number of coefficients in the contest of a classical linear intersymbol-interference channel with Gaussian noise and a memoryless decision device. If the number of equalizer coefficients is sufficient, the popular minimum mean-squared-error (MMSE) linear equalizer closely approximates the optimal linear equalizer that directly minimizes bit-error rate (BER). However, when the number of equalizer coefficients is insufficient to approximate the channel inverse, the minimum-BER equalizer ran outperform the MMSE equalizer by as much as 16 dB in certain cases. We propose a simple stochastic adaptive algorithm for realizing the minimum-BER equalizer. Compared to the least-mean-square algorithm, the proposed algorithm can provide a substantial reduction in BER with no increase in complexity.
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