FTN系统中的低复杂度接收技术比较

Low-Complexity Receiver Technology in Faster-than-Nyquist Transmission System

超奈奎斯特码元速率传输(Faster-than-Nyquist)可以有效提高系统的带宽有效性和通信系统的传输速率,但在接收端不可避免地引入无限长的码间串扰(ISI),增加了接收设备特别是接收机的复杂度。为了降低接收端的复杂度,重点介绍FTN传输系统中的低复杂度接收技术及其改进方案,包括加窗Chase均衡(WCE)和改进型WCE、迭代分组判决反馈均衡器(IBDFE)和低复杂度IBDFE(LC-IBDFE)、判决反馈均衡(DFE)和部分判决反馈均衡(PDFE),同时分别从计算复杂度和系统误码率性能两个方面进行分析比较,给出各方法的优缺点及应用场合。

FTN signaling, with faster symbol rate than Nyquist rate, is regarded as a promising technique to improve the bandwidth efficiency. However the unavoidable ISI（inter-symbol interference） in the receiver would usually result in high complexity of the receiving device and the receiver as well. In order to offectively reduce the interference, low-complexity receiver technology and the modified algorithms are proposed, including WCE（Windows Chase Equalization） and FTN-MWCE, IBDFE （Iterative Decision Feedback Equalization） and LC-IBDFE, DFE （Decision Feedback Equalization） and PDFE（Partial Decision Feedback Equalization）. The analysis on and comparison of these algorithms are done respectively from computation complexity and BER performance, and their advantages disadvantages, and applications as well also presented.