학술논문
Optimization of Sign-Preserving Noise-Aided Min-Sum Decoders with Density Evolution
Document Type
Conference
Author
Source
2018 IEEE 10th International Symposium on Turbo Codes & Iterative Information Processing (ISTC) Turbo Codes & Iterative Information Processing (ISTC), 2018 IEEE 10th International Symposium on. :1-5 Dec, 2018
Subject
Language
ISSN
2165-4719
Abstract
The novelty of this paper is to propose a new LDPC decoder called Sign-Preserving Noise-Aided Min-Sum (SP-NA-MS) decoder that improves the decoding performance compared to classical Offset Min-Sum (OMS) decoder when messages are quantized, with only 3 or 4 bits. The particularity of the SP-NA-MS decoder is that the variable-to-check messages are never set to 0, and always carry the sign information. Moreover, the decoder incorporates random perturbation due to deliberate noise injection. The parameters of the SP-NA-MS decoders are optimized in the asymptotic limit of the code length thanks to the Density Evolution (DE) method. The finite-length simulations confirm the conclusions of the DE analysis and gain of up to 0.3 dB in SNR can be obtained compared to regular OMS with same quantization level.