一种改进的SC-FDE块迭代判决反馈均衡器

An Improved Iterative Block Decision Feedback Equalization for SC-FDE System

单载波频域均衡(SC-FDE)系统能有效地对抗频域选择性衰落信道。块迭代判决反馈均衡(IBDFE)是单载波频域均衡系统中一种有效的非线性均衡算法,但是其计算复杂度较高,且复杂度与迭代次数成正比。鉴于此,提出一种改进算法,在改进算法中,将接收信号经过MMSE均衡得到发送信号估计值作为传统算法反馈支路输出,前馈支路结构保持不变。对比传统IBDFE算法,迭代被取消,故降低了计算复杂度。对传统IBDFE算法和改进IBDFE算法性能进行比较,实验结果证明:改进IBDFE算法性能在与传统IBDFE算法性能相似的条件下降低了计算复杂度。

The single carrier frequency domain equalization （ SC-FDE） system can effectively work in frequency selective fading channel.The iterative block decision feedback equalization （ IBDFE） is a kind of effective nonlinear equalization algorithm in single carrier frequency domain equalization systems with high computational complexity, which is proportional to the number of iterations. In view of this,an improved algorithm is proposed.In this algorithm,the estimate of sending signals as the output of the feedback loops is obtained by the MMSE equalization of the received signal and the structure of feed forward branch remains unchanged. Compared with the traditional IBDFE algorithm,the iteration is canceled,so the computational complexity is reduced.The experimental results show that the improved IBDFE algorithm can reduce the computational complexity and its performances are similar to that of traditional IBDFE algorithm.