基于信道估值的判决反馈均衡器研究

比较分析了基于信道参数得到的滤波器系数解分别作为均衡器前向和反馈滤波器的最优解及最优初始解的情况下均衡的性能改善程度,并将波特间隔判决反馈均衡器(BS-DFE)和分数间隔判决反馈均衡器(FS-DFE)的性能作了比较.理论和仿真分析表明:基于信道参数得到的滤波器系数解如果作为均衡器前向和反馈滤波器的最优解,在信道保持不变的情况下有优势;将基于信道参数得到的滤波器系数解作为均衡器前向和反馈滤波器的最优初始化解,结合不同的均衡器结构(BS-DFE和FS-DFE),与LMS算法结合,得到的均衡效果在不同程度上得到改善,FS-DFE均衡的效果比BS-DFE的均衡效果更加收敛,但运算量并没有得到改善.研究表明:在不同的情况下,各种均衡方式方法都有其自身特点,根据实际要求采用不同的均衡方式或同时使用会取得最佳效果.

The Study on Decision Feedback Equalizer Based on Channel Estimation

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.