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

作者：Yang Yang^*; Xiong Zixiang; Wu Yu chun; Zhang Philipp

来源：IEEE Communications Letters, 2012, 16(10): 1544-1547.

DOI：10.1109/LCOMM.2012.082012.120943

• Dirty-paper coding
• log-likelihood ratio
• low-density parity-check codes
• multilevel coding
• trellis-coded quantization

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.

• 出版日期2012-10