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A Density Evolution Based Framework for Dirty-Paper Code Design Using TCQ and Multilevel LDPC Codes

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4 Author(s)
Yang Yang ; Dept. of ECE, Texas A&M Univ., College Station, TX, USA ; Zixiang Xiong ; Wu Yu-chun ; Zhang, P.

We propose a density evolution based dirty-paper code design framework that combines trellis coded quantization with multi-level low-density parity-check (LDPC) codes. Unlike existing design techniques based on Gaussian approximation and EXIT charts, the proposed framework tracks the empirically collected log-likelihood ratio (LLR) distributions at each iteration, and employs density evolution and differential evolution algorithms to design each LDPC component code. The performance of the dirty-paper codes designed using the proposed method comes within 0.37 dB of the theoretical limit at 1 bit per sample transmission rate, achieving an 0.21 dB gain over the best known result.

Published in:

Communications Letters, IEEE  (Volume:16 ,  Issue: 10 )