A Blind Adaptive Equalizer for QAM Demodulation
WU Jian-hui · Dianzi qijian · 2006
A blind adaptive equalizer for digital QAM demodulator ASIC chip is designed. The equalizer has been designed using CMA(Constant Modulus Algorithm) and DD-LMS (Decision direction-Least Mean Square) algorithms ,combined with a DFE (Decision Feedback Equalizer)structure. The proposed equalizer uses two DFE filter banks to improve the channel adaptive performance and to reduce the number of taps. Through simplifying algorithm and optimizing circuit architecture, hardware resource is decreased; circuit’s area and power are reduced.