Blind Equalization Algorithm of High-order QAM Signal and Its FPGA-based Implementation
Bin Wang · Jisuanji gongcheng · 2010
Aiming at blind equalization problem of QAM signal,this paper proposes a hybrid blind equalization algorithm named GMMA-DD by combining Generalized Multi-Modulus Algorithm(GMMA) and Decision-Directed(DD) algorithm.It combines the benefits of GMMA and DD algorithm,and utilizes the mean square error to control the proportion of two kind of error signals in total error signals to improve the performance of blind equalization.An improved algorithm with lower computational complexity and less FPGA resources is presented and implemented to simplify FPGA-based implementation by using serial and pipelining structures.Experimental results show that the algorithm has good performance for high-order QAM signals.