Successive Wyner-Ziv Coding for the Binary CEO Problem under Logarithmic Loss
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The L-link binary Chief Executive Officer (CEO) problem under logarithmic loss is investigated in this paper. By adopting a binary-symmetric test-channel model for each encoder, we drive an inner bound for the rate-distortion region of this problem. Moreover, a quantization splitting technique is applied to convert the problem under consideration to a (2L-1)-step successive Wyner-Ziv (WZ) problem, for which a practical coding scheme is proposed. In the proposed scheme, low-density generator-matrix (LDGM) codes are used for binary quantization while low-density parity-check (LDPC) codes are used for syndrome generation; the decoder performs successive decoding based on the received syndromes and produces a soft reconstruction of the remote source. The simulation results indicate that the rate-distortion performance of the proposed scheme can approach the aforementioned theoretical inner bound.
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