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Row-Column Soft-Decision Feedback Algorithm for Two-Dimensional Intersymbol Interference

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3 Author(s)
Taikun Cheng ; Washington State Univ., Pullman ; Belzer, B.J. ; Sivakumar, K.

We present a novel iterative row-column soft decision feedback algorithm (IRCSDFA) for detection of binary images corrupted by 2-D intersymbol interference and additive white Gaussian noise. The algorithm exchanges weighted soft information between row and column maximum a posteriori (MAP) detectors. Each MAP detector exploits soft-decision feedback from previously processed rows or columns. The new algorithm gains about 0.3 dB over the previously best published results for the 2times2 averaging mask. For a non-separable 3times3 mask, the IRCSDFA gains 0.8 dB over a previous soft-input/soft-output iterative algorithm which decomposes the 2-D convolution into 1-D row and column operations.

Published in:

Signal Processing Letters, IEEE  (Volume:14 ,  Issue: 7 )