An Equalizer Applied for Nonminimum Phase System with High Performance
Zujun Liu · Beijing Youdian Xueyuan xuebao · 2009
Conventional equalizers could hardly work effectively in the severe fading channel with zero on the unit circle.A combing technique is presented aiming at equalization of such nonminimum phase channels.The received signal is equalized separately by infinite impulse response(IIR) equalizer and time-reversal(TR) IIR equalizer with decision feedback(DF) architecture.And then the output signals from the two equalizers are combined together for demodulation.Since IIR and TR-IIR equalizers can process the same symbol under independent noise background,the signal-to-noise ratio(SNR) is increased evidently after combining,and the error propagation effect in the DF-IIR equalizer is effectively depressed.It is shown by simulations that the new scheme can surpass the perfect performance bound of filter equalization methods.