The Study on Decision Feedback Equalizer Based on Channel Estimation
Ban Xiao-dong · Journal of Southwest University of Science and Technology · 2006
A comparative study on performance improvement degree between baud-spaced decision feedback equalizer(BS-DFE) and fractionally-space decision feedback equalizer(FS-DFE) has been carried out,as the filter coefficients based on channel estimated parameters is used as optimal solution and optimal initial solution respectively in the forward and feedback filters.The theory and the simulation results show: if the filter coefficients based on channel estimated parameters are used as optimal solution,the equalizer has advantage in the static channel;if they are used as optimal initial solution,performances of equalizers are both improved in certain degree by combining the structures of equalizer(BS-DFE and FS-DFE with the LMS algorithm,while FS-DFE performs better than BS-DFE in convergence effect without changing computational complexity.The research indicates that each kind of equalizers has its certain advantage in specific condition.Good effect can be obtained if one or more types of equalizers were adopted appropriately according to the practical environment.