采用反馈滤波器组的单载波迭代均衡接收机

A single carrier iterative equalizer receiver with feedback filter bank is proposed to solve the multipath effect in broadband wireless communication. Firstly, a feedback filter bank and a feedforward filter are designed by exploiting signal diversity brought by multipath delay. The main function of the feedback filter bank in the equalizer is to eliminate intersymbol interference between different delay signals as much as possible, and the main function of the feedforward filter is to combine the multipath components after the interference elimination. Then, by exploiting the minimum mean square error criterion, the feedforward coefficient and the feedback filter bank coefficient are optimized jointly to obtain the optimal solutions of the coefficients, and the optimal separation and diversity combination of multipath components are realized. Finally, the correlation coefficients in the filter coefficients are estimated, and the maximum ratio combination is carried out for the cyclic prefix part of the balanced signal to increase the signal to noise ratio. Simulation results and a comparison with the existing single carrier iterative equalizer receivers show that in the case that the length of the multipath channel does not exceed the length of the cyclic prefix, when the bit error rate is 10^-5, the performance of the receiver improves by 0.5 dB after the first iteration, and approximates the matched filter boundary faster with the increase of iteration times; In the case that the length of the multipath channel exceeds the length of the cyclic prefix, the "platform effect" of bit error rate and frame error rate are eliminated effectively, and when the bit error rate is 10^-5, the performance is improved by 4 dB after two iterations to approximate the matched filter boundary.