Joint design of QC-LDPC codes for coded cooperation system with joint iterative decoding

Zhang, Shunwai; Yang, Fang; Tang, Lei; Ejaz, Saqib; Luo, Lin; Maharaj, B. T.

doi:10.1080/00207217.2015.1036374

Cited by 11 publications

(17 citation statements)

References 28 publications

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“…Convergence threshold for conventional QC-LDPC, 36 Rate = 1 / 2 , E b / N 0 = [ − 0 . 4 , 0 . 6 , 1 . 6 ] dB.…”

Section: Numerical Resultsmentioning

confidence: 99%

“…The performance of coded cooperation has been investigated based on turbo and LDPC codes. 9,[27][28][29][30][31][32][33][34][35][36] However, LDPC-coded cooperation provides more advantages over turbo-coded cooperation in terms of low-cost decoding and delay for hardware implementation of decoder. 9 To the best of our knowledge, most of the previous studies have investigated LDPC-coded cooperation by utilizing random LDPC codes.…”

Section: Introductionmentioning

confidence: 99%

“…However, the investigation on QC-LDPC-coded cooperation is rarely discussed. 30,[34][35][36] As compared to QC-LDPC-coded cooperation, random LDPC-coded cooperation provides a limited spectrum in terms of code length and rate with quadratic encoding complexity. However, QC-LDPC-coded cooperation provides more flexibility in terms of code length and rate selection with linear encoding complexity.…”

Section: Introductionmentioning

confidence: 99%

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Jointly designed quasi-cyclic LDPC-coded cooperation with diversity combining at receiver

Asif

Zhou

et al. 2020

International Journal of Distributed Sensor Networks

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This correspondence proposes a jointly-designed quasi-cyclic (QC) low-density parity-check (LDPC)-coded multi-relay cooperation with a destination node realized by multiple receive antennas. First, a deterministic approach is utilized to construct different classes of binary QC-LDPC codes with no length-4 cycles. Existing methods put some limitations in terms of code length and rate in order to provide high error-correction performance. Therefore, this article gives three classes of QC-LDPC codes based on a combinatoric design approach, known as cyclic difference packing (CDP), with flexibility in terms of code-length and rate selection. Second, the proposed CDP-based construction is utilized to jointly-design QC-LDPC codes for coded-relay cooperation. At the receiver, the destination node is realized by multiple receive antennas, where maximal-ratio combining (MRC) and sum-product algorithm (SPA)-based joint iterative decoding are utilized to decode the corrupted sequences coming from the source and relay nodes. Simulation results show that the proposed QC-LDPC coded-relay cooperations outperform their counterparts with a coding gain of about 0.25 dB at bit-error rate (BER) [Formula: see text] over a Rayleigh fading channel in the presence of additive white Gaussian noise. Furthermore, the extrinsic-information transfer (EXIT) chart analysis has been used to detect the convergence threshold of proposed jointly-designed QC-LDPC codes. Numerical analysis shows that the proposed jointly-designed QC-LDPC codes provide a better convergence as compared to their counterparts under the same conditions.

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“…Convergence threshold for conventional QC-LDPC, 36 Rate = 1 / 2 , E b / N 0 = [ − 0 . 4 , 0 . 6 , 1 . 6 ] dB.…”

Section: Numerical Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Jointly designed quasi-cyclic LDPC-coded cooperation with diversity combining at receiver

Asif

Zhou

et al. 2020

International Journal of Distributed Sensor Networks

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“…D is a quasidiagonal matrix in which all elements are zero except the elements of the principal diagonal and the elements immediately below this diagonal. A is a quasicyclic sparse matrix which is constructed based on the base matrix and exponent matrix [26]. We refer to A and D as the quasi-cyclic (QC) part and quasidiagonal (QD) part, respectively.…”

Section: Qc-ra Codes-a Kind Of Rate Compatible Ldpc Codesmentioning

confidence: 99%

Multisource SWIPT-based coded cooperation:rate compatible codes and codeword splitting protocol

Zhang

Kong

2020

J Wireless Com Network

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To achieve a high reliable and energy-saving green communication, we investigate a multisource simultaneous wireless information and power transfer (SWIPT)-based coded cooperation where the relay can realize information decoding and energy harvesting. Firstly, a class of naturally rate compatible low-density parity-check (LDPC) codes–quasi-cyclic repeat-accumulate (QC-RA) codes is introduced, and the joint parity-check matrix corresponding to the QC-RA codes employed by the multiple sources and relay is deduced. Based on the joint parity-check matrix, we jointly design the QC-RA codes to cancel all the short girth cycles. Then, by exploiting the rate compatible characteristic of QC-RA codes, we propose a new SWIPT protocol—codeword splitting protocol for the proposed system, which has the characteristics of lower complexity, higher efficiency, no strictly bit synchronization limitation, and less hardware requirement. The results show that the bit error rate (BER) performance of the proposed system employing jointly designed QC-RA codes clearly outperforms that of general RA codes. Theoretical analysis and numerical simulations also demonstrate the superiority of the proposed codeword splitting protocol.

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“…Coded cooperation as a combination of cooperative schemes and channel coding is a technique that effectively combats the channel impairments [4], [5]. There are three basic relaying techniques, i.e., amplify-and-forward (AF) [6], decode-and-forward (DF) [7] and compress-and-forward (CF) [8]. In the AF, the relay directly sends an amplified version of the information received from the transmitter to the destination.…”

Section: Introductionmentioning

confidence: 99%

Distributed QC-LDPC Coded Spatial Modulation for Half-Duplex Wireless Communications

Zhao¹,

Yang²,

Waweru³

et al. 2022

RADIOENGINEERING

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The bit error rate (BER) performance of spatial modulation (SM) can be further improved by applying quasi-cyclic low-density parity-check (QC-LDPC) codes recommended in 5G to SM. It motivates us to propose a QC-LDPC coded SM (QC-LDPCC-SM) scheme, where SM signals are protected by QC-LDPC codes. To estimate the channel state information at the receiver, a novel iterative joint channel estimation and data detection based on variable block length (IJCEDD-VBL) for SM is presented. In standard 5G LDPC codes, the parity-check matrix contains multiple submatrices, and then we can construct two different QC-LDPC codes by suitably selecting the submatrices. Thus, the QC-LDPCC-SM scheme can be effectively extended to cooperative scenarios when deploying the generated LDPC codes at the source and relay, respectively. We develop an analytical approach for the BER performance of the proposed schemes. The simulation and theoretical results are in good agreement at high signal-to-noise ratio (SNR). Furthermore, the proposed coded cooperative scheme outperforms its corresponding non-cooperative counterpart and the existing scheme. The numerical results also validate the effectiveness of the proposed channel estimation scheme.

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Joint design of QC-LDPC codes for coded cooperation system with joint iterative decoding

Cited by 11 publications

References 28 publications

Jointly designed quasi-cyclic LDPC-coded cooperation with diversity combining at receiver

Jointly designed quasi-cyclic LDPC-coded cooperation with diversity combining at receiver

Multisource SWIPT-based coded cooperation:rate compatible codes and codeword splitting protocol

Distributed QC-LDPC Coded Spatial Modulation for Half-Duplex Wireless Communications

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