Jointly designed quasi-cyclic LDPC-coded cooperation with diversity combining at receiver. (July 2020)

• Record Type: Journal Article
• Authors: Asif, Muhammad; Zhou, Wuyang; Yu, Qingping; Adnan, Saifullah; Ali, Md Sadek; Iqbal, Muhammad Shahid
• Is Part Of: International journal of distributed sensor networks. Volume 16:Number 7(2020)
• Publication Date: 2020-07
• Subjects: Quasi-cyclic LDPC -- cyclic difference packing -- jointly-designed QC-LDPC -- coded-relay cooperation -- maximal-ratio combining -- joint iterative-decoding; Sensor networks -- Periodicals; Intelligent agents (Computer software) -- Periodicals; Multisensor data fusion -- Periodicals; 681.2
• DOI: 10.1177/1550147720938974
• Languages: English
• ISSNs: 1550-1329

Abstract

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)10 − 6 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.