Publisher DOI: 10.1109/TCOMM.2022.3149913
Title: Reconstruction-computation-quantization (RCQ): a paradigm for low bit width LDPC decoding
Language: English
Authors: Wang, Linfang 
Terrill, Caleb 
Stark, Maximilian  
LI, Zongwang 
Chen, Sean 
Hulse, Chester 
Kuo, Calvin 
Wesel, Richard D. 
Bauch, Gerhard 
Pitchumani, Rekha 
Keywords: FPGA;Hardware efficiency;Layered decoding;LDPC decoder;Low bit width decoding
Issue Date: 7-Feb-2022
Publisher: IEEE
Source: IEEE Transactions on Communications 70 (4): 2213-2226 (2022-04-01)
Journal: IEEE transactions on communications 
Abstract (english): 
This paper uses the reconstruction-computation-quantization (RCQ)paradigm to decode low-density parity-check (LDPC) codes. RCQ facilitates dynamic non-uniform quantization to achieve good frame error rate (FER) performance with very low message precision. For message-passing according to a flooding schedule, the RCQ parameters are designed by discrete density evolution. Simulation results on an IEEE 802.11 LDPC code show that for 4-bit messages, a flooding Min Sum RCQ decoder outperforms table-lookup approaches such as information bottleneck (IB) or Min-IB decoding, with significantly fewer parameters to be stored. Additionally, this paper introduces layer-specific RCQ, an extension of RCQ decoding for layered architectures. Layer-specific RCQ uses layer-specific message representations to achieve the best possible FER performance. For layer-specific RCQ, this paper proposes using layered discrete density evolution featuring hierarchical dynamic quantization (HDQ) to design parameters efficiently. Finally, this paper studies field-programmable gate array (FPGA) implementations of RCQ decoders. Simulation results for a (9472, 8192) quasi-cyclic (QC) LDPC code show that a layered Min Sum RCQ decoder with 3-bit messages achieves more than a 10% reduction in LUTs and routed nets and more than a 6% decrease in register usage while maintaining comparable decoding performance, compared to a 5-bit offset Min Sum decoder.
ISSN: 1558-0857
Institute: Nachrichtentechnik E-8 
Document Type: Article
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