Blind channel-shortening for wireless communication with a recursive delayed prediction-error filter

Linear Prediction in Prediction-Error Filter implementation is a well-known technique for communication channel equalization. Here, we show how a recursive version may be used with additional prediction delay for blind channel-shortening of wireless channels with Multi-Carrier Modulation signals. We observe the recursive prediction-error filter impulse response adapts to minimum-phase form, required for stability. The recursive mode allows the filter length to be significantly shorter than in non-recursive form. Good equalization of minimum-phase channels is obtained. Additional prediction delay ameliorates the filter response to maximum-phase terms within a channel, so that partial equalization may be achieved other than for channels with severe maximum-phase terms.