An improved decision feedback channel estimation algorithm for multiple-input multiple-output orthogonal frequency division multiplexing underwater acoustic communication

To overcome the disadvantage of error propagation, an improved decision feedback channel estimation algorithm based on compressed sensing technology is proposed for multiple-input multiple-output orthogonal frequency division multiplexing communication in low signal-to-noise ratio underwater acoustic environment. The corrected and the original information are used to contrive the decision feedback channel estimation. And taking advantage of neritic channel's sparse characters, the channels can be constructed by matching pursuit ameliorated minimum mean square error decision feedback channel estimation algorithm without error propagation. Experiment results performed with numerical simulation and tank-trial data are provided, demonstrating that the proposed algorithm can effectively reduce the occupancy of pilots, abate the burst noise effect, offer confined error propagation and significantly increase the quality of the system. © 2016 Acta Acustica.