Quasi-Cyclic LDPC Codes for Short Block-Lengths

Danish, Muhammad Nauman; Pasha, Syed Ahmed; Hashmi, Ali

doi:10.1109/aero50100.2021.9438238

Cited by 4 publications

(3 citation statements)

References 32 publications

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“…Step 1. Initialize the variable nodes according to Equation (7), where L j denotes the result of the channel message after initialization, y j denotes the actual value received by the channel and v j denotes the estimated value of the code word. According to the Tanner diagram, for h ij = 1, let L j→i = L j :…”

Section: Ldpc Decoding Algorithmmentioning

confidence: 99%

“…MN Danish et al constructed a quasi-cyclic LDPC (QC-LDPC) code based on Euclidean geometry and cyclic decomposition, which has a shorter girth, and, by comparing the BER performance of LDPC codes based on the randomized construction method with those constructed based on this method under different modulation modes, the (256,128) code based on the design of the method has a good performance [7]. Medova L R et al proposed a new method for constructing LDPC codes based on the Orange Book of the Consultative Committee on Space Data Systems (CCSDS), "Short Block Length LDPC Codes for TC Synchronization and Channel Coding", and the simulation experiments show that, compared with the LDPC codes in the experimental specification, the LDPC code constructed using this method can obtain about a 0.4 dB gain when the SER is 1 ×10 −7 [8].…”

Section: Introductionmentioning

confidence: 99%

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Short-Block-Length Low-Density Parity-Check Codes-Based Underwater Acoustic Spread-Spectrum Communication System

Zhao,

Sun

2023

Electronics

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Low-density parity-check (LDPC) codes are commonly used in communication systems to improve the system performance, but LDPC codes takes too long for decoding, making communication inefficient and unsuitable for short-frame data transmission methods. In underwater acoustic channels, spread-spectrum communication becomes an effective way to realize long-distance communication. This paper combines short-block LDPC codes with a direct sequence spread spectrum and soft spread spectrum in underwater acoustic communication, addressing the problem of the inapplicability of conventional LDPC codes. The applicability of the proposed method in this paper is verified through simulation tests and pool experiments. The results indicate that the proposed communication system achieves lower bit error rates compared to the classical coding methods used in underwater acoustic spread-spectrum communication systems under the same channel conditions.

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Section: Ldpc Decoding Algorithmmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Short-Block-Length Low-Density Parity-Check Codes-Based Underwater Acoustic Spread-Spectrum Communication System

Zhao,

Sun

2023

Electronics

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“…In 1962, R. Gallager introduced the first classical LDPC codes [ 41 ], and it was rediscovered again by MacKay in the late 1990s [ 42 ]. In 2018, the 3rd Generation Partnership Project (3GPP) chose QC-LDPC codes as the standard codes for 5G networks and applications based on the properties and characteristics of classical LDPC codes, especially for a short-length frame with lower processing throughput for uRLLC and the mMTC or massive Machine-to-Machine (mM2M) communications [ 32 , 34 , 43 , 44 , 45 ]. Moreover, the authors in [ 46 , 47 , 48 ] showed that 5G QC-LDPC codes are also an optimised design for short-packet transmission because of the low error floor and high-speed transmission.…”

Section: Conventional Sb _dsiced3 _w/of Schemementioning

confidence: 99%

Joint Semi-Blind Self-Interference Cancellation and Equalisation Processes in 5G QC-LDPC-Encoded Short-Packet Full-Duplex Transmissions

Vuong

Gautier

et al. 2022

Sensors

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The paper proposes a joint semi-blind algorithm for simultaneously cancelling the self-interference component and estimating the propagation channel in 5G Quasi-Cyclic Low-Density Parity-Check (QC-LDPC)-encoded short-packet Full-Duplex (FD) transmissions. To avoid the effect of channel estimation processes when using short-packet transmissions, this semi-blind algorithm was developed by taking into account only a small number (four at least) pilot symbols, which was integrated with the intended information sequence and used for the feedback loop of the estimation of the channels. The results showed that this semi-blind algorithm not only achieved nearly optimal performance, but also significantly reduced the processing time and computational complexity. This semi-blind algorithm can also improve the performances of the Mean-Squared Error (MSE) and Bit Error Rate (BER). The results of this study highlight the potential efficiency of this joint semi-blind iterative algorithm for 5G and Beyond and/or practical IoT transmission scenarios.

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