Decision Feedback Estimation of Multiple input /Multiple output Orthogonal Frequency Division Multiplexing Channel Based on Punching Technique Via UWA Shallow Sea
WANG Wei;QIAO Gang;WANG Yue;XING Si-yu;LIU Song-zuo;Science and Technology on Underwater Acoustic Laboratory,Harbin Engineering University;
The technique of channel decision feedback estimation of multiple input /multiple output orthogonal frequency division multiplexing( MIMO-OFDM) underwater acoustic communication system is studied. To overcome the disadvantage of error code propagation of channel decision feedback estimation algorithm,an improved algorithm based on channel punching technique is proposed. The difference between the received raw signal and the re-coded information signal is used to judge the criteria of channel compensation,and those uncertain sub-channels are punched and revalued by interpolation technique.The experimental results obtained with numerical simulation and tank-trial data are provided,demonstrating that the proposed algorithm can effectively confine the propagation of error code,abate the burst noise effect,track the variety of channel and significantly increase the quality of the system.