改进的SC-FDE块迭代判决反馈均衡器

在单载波频域传输(SC-FDE)系统中,块迭代判决反馈均衡器(IBDFE)明显提升了传统线性频域均衡器的性能.未知发送信号与迭代判决信号的相关因子估计是其关键技术,直接影响均衡器的性能.首先对IBDFE相关因子估计算法进行了改进,同时提出一种基于独特字(UW)帧结构的估计方法.该方法利用独特字的已知性和恒包络性进行判决,基于此判决方式使相关因子得到更精准的估计.实验结果表明,两种方法对IBDFE的性能有较为明显的提升.

Improved Block Iterative Decision Feedback Equalizer in SC-FDE System

In single carrier transmission system, the iterative block decision feedback equalizer(IBDFE) obviously improve the performance of traditional linear frequency domain equalizer. The key part of a block iterative decision feedback equalizer is correlation factor estimation of the unknown sending signal and iteration decision signal which would affect the performance of the equalizer directly. In this paper, correlation factor estimation algorithm was modified at first, and an improved block iterative decision feedback equalizer was proposed based on its UW extension frame structure. Owing the known nature of UW, a decision method of UW is proposed. Utilizing this method, more accurate correlation factors were estimated. The simulation results indicate that higher performance can be achieved by using these two methods.