Results 21 to 30 of about 92,025 (163)
Performance analysis of LDPC coded GFDM systems
IET Communications, Volume 16, Issue 14, Page 1663-1673, August 2022., 2022 Abstract This paper analyzes the error probability performance of low‐density parity‐check (LDPC) coded generalized frequency division multiplexing (GFDM) systems over Rayleigh fading and additive white Gaussian noise (AWGN) channels. The initial log‐likelihood ratio (LLR) expressions used in the sum‐product algorithm (SPA) decoder are first derived ...
Yanpeng Wang, Paul Fortier
wiley +1 more source
Optimizing quasi-cyclic spatially coupled LDPC codes by eliminating harmful objects
EURASIP Journal on Wireless Communications and Networking, 2023 It is well known that some harmful objects in the Tanner graph of low-density parity-check (LDPC) codes have a negative impact on their error correction performance under iterative message-passing decoding.
Massimo Battaglioni +4 more
doaj +1 more source
160-Gb/s NRZ-DQPSK optical transmission system employing QC-LDPC code [PDF]
, 2014 A quasi-cyclic low-density parity check (QC-LDPC) code is constructed by an improved stability of the shortest cycle algorithm for 160-Gb/s non-return zero differential quadrature phase shift keying (NRZ-DQPSK) optical transmission system with the fiber ...
Yu, Chongxiu +4 more
core +1 more source
DNN‐aided read‐voltage threshold optimization for MLC flash memory with finite block length
IET Communications, Volume 16, Issue 2, Page 120-130, January 2022., 2022 Abstract The error‐correcting performance of multi‐level‐cell (MLC) NAND flash memory is closely related to the block length of error‐correcting codes (ECCs) and log‐likelihood‐ratios of the read‐voltage thresholds. Driven by this issue, this paper optimizes the read‐voltage thresholds for MLC flash memory to improve the decoding performance of ECCs ...
Cheng Wang +6 more
wiley +1 more source
ON THE CLASS OF ARRAY-BASED APM-LDPC CODES [PDF]
Journal of Algebraic Systems, 2021 We construct an explicit class of affine permutation matrix low-density parity-check (APM-LDPC) codes based on the array parity-check matrix by using two affine maps f (x) = x-1 and g(x) = 2x-1 on Z_m, where m is an odd prime number, with girth 6 and ...
A. Nassaj, A. R. Naghipour
doaj +1 more source
A Viterbi Decoder under Class A Modeled Noise in Shallow Water
Wireless Communications and Mobile Computing, Volume 2022, Issue 1, 2022., 2022 A traditional Viterbi decoder is primarily optimized for additive white Gaussian noise (AWGN). With the AWGN channel, it offers good decoding performance. However, the underwater acoustic communication (UAC) channel is extremely complicated. In addition to white noise, there are a variety of artificial and natural impulse noise that occur suddenly. The
Yifei Wang +11 more
wiley +1 more source
A High Throughput Implementation of QC-LDPC Codes for 5G NR
IEEE Access, 2019 Quasi-cyclic low-density parity-check (QC-LDPC) codes are the choice for data channels in the fifth generation (5G) new radio (NR). At the transmitter side, code bits from the QC-LDPC encoder are delivered to the rate matcher.
Hao Wu, Huayong Wang
doaj +1 more source
Design of Nonbinary LDPC Cycle Codes with Large Girth from Circulants and Finite Fields
Wireless Communications and Mobile Computing, Volume 2021, Issue 1, 2021., 2021 In this paper, we study a class of nonbinary LDPC (NBLDPC) codes whose parity‐check matrices have column weight 2, called NBLDPC cycle codes. We propose a design framework of (2, ρ)‐regular binary quasi‐cyclic (QC) LDPC codes and then construct NBLDPC cycle codes of large girth based on circulants and finite fields by randomly choosing the nonzero ...
Hengzhou Xu +6 more
wiley +1 more source
Design of LDPC Codes: A Survey and New Results [PDF]
, 2006 This survey paper provides fundamentals in the design of LDPC codes. To provide a target for the code designer, we first summarize the EXIT chart technique for determining (near-)optimal degree distributions for LDPC code ensembles.
Ryan, William E. +11 more
core +1 more source
Algebra-Assisted Construction of Quasi-Cyclic LDPC Codes for 5G New Radio
IEEE Access, 2018 Quasi-cyclic LDPC (QC-LDPC) codes have been accepted as the standard codes of 5G enhanced mobile broadband data channel. These standard codes are designed to support multiple lifting sizes and possess rate-compatible property, which can help adapt ...
Huaan Li +4 more
doaj +1 more source