一种分数间隔解相关判决反馈盲均衡算法

A novel fractionally spaced de-correlation decision feedback blind equalization algorithm

针对波特间隔盲均衡算法的缺陷,利用分数间隔盲均衡算法能获得更多更详细的信道信息,判决反馈滤波器能补偿深度谱零点信道畸变所产生的影响,解相关常数模算法能加快收敛速度的优点,提出一种分数间隔解相关判决反馈盲均衡算法(FSDDFE)。该算法采用分数间隔加判决反馈的模型结构,在均衡器(前馈滤波器)权系数的调整中,引入了解相关常数模算法,使FSDDFE算法的收敛速度显著加快、均方误差明显减少。水声信道的仿真结果,验证了该算法的有效性能。

Aiming at the defects of baud spaced based blind equalizer（FSE） , a novel fractionally spaced de-correlation decision feedback blind equalization algorithm （FSDDFE）is proposed. The FSDDFE employs the FSE for obtaining the more detailed channel information, uses decision feedback filer to eliminate the effects of channel distortion or multi-path, and utilizes the de-correlation constants modulus algorithm to improve the convergent rate. In the proposed FSDDFE, the de-correlation constants modulus algorithm is introduced into the updating process of equalizer weight vectors. Accordingly, the FSDDFE outperforms the Baud spaced de-correlation decision feedback blind equalization （BSDDFE）algorithm and fractionally spaced decision feedback blind equalization （FSDFE）algorithm in improving convergent rate and reducing the mean square error. The efficiency of the FSDDFE is proofed via the simulation tests with underwater acoustic channel.