Decision feedback equalization of frequency-selective Rician fading channels

Abstract

The time-varying tap coefficients of the frequency-selective Ricain fading channels are typically modeled as complex Gaussian stochastic processes. This study proposes a novel design method of optimal decision feedback equalizer (DFE) for such fading channels. In the proposed design method, based on the estimated dynamic characteristics of Rician fading channel, a realizable DFE, which is constructed to minimize the mean square error from the perspective of frequency domain, is designed to recover the transmitted sequence. The main advantage of the proposed design method is that only a fixed equalizer is required to treat the equalization problem of Rician fading channels. Furthermore, since the dynamic characteristics of Rician fading channels are considered in the design procedure, the proposed DFE possesses better tracking ability as compared to the conventional adaptive equalizer. Consequently, the proposed DFE exhibits a better reconstruction performance than the conventional adaptive equalizer. To illustrate the superior performance of the proposed design method, two simulation examples are presented.