Uniform vs. Non-Uniform Coarse Quantization in Mutual Information Maximizing LDPC Decoding

Publikationstyp
Conference Paper
Date Issued
2022-12
Sprache
English
Author(s)
Mohr, Philipp  orcid-logo
Bauch, Gerhard  
Institut
Nachrichtentechnik E-8  
TORE-URI
http://hdl.handle.net/11420/14585
Citation
IEEE Global Communications Conference (GLOBECOM 2022)
Contribution to Conference
IEEE Global Communications Conference, GLOBECOM 2022  
Publisher DOI
10.1109/GLOBECOM48099.2022.10001452
Scopus ID
2-s2.0-85143395897
Recently, low-resolution LDPC decoders have been introduced that perform mutual information maximizing signal processing. However, the optimal quantization in variable and check nodes requires expensive non-uniform operations. Instead, we propose to use uniform quantization with a simple hardware structure, which reduces the complexity of individual node operations approximately by half and shortens the decoding delay significantly. Our analysis shows that the loss of preserved mutual information resulting from restriction to uniform quantization is very small. Furthermore, the error rate simulations with regular LDPC codes confirm that the uniform quantization causes only minor performance degradation within 0.01 dB compared to the non-uniform alternative. Due to the complexity reduction, especially the proposed 3-bit decoder is a promising candidate to replace 4-bit conventional decoders.