A High Performance Joint Detection and Decoding Scheme for LDPC Coded SCMA System

Han, Kaining; Zhang, Zhenbing; Hu, Jianhao; Chen, Jienan

doi:10.1109/glocomw.2016.7848813

Cited by 20 publications

(16 citation statements)

References 9 publications

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“…Similar to SDD, after the same initialisation as that of the MPA detector of SDD, the JDD starts out by updating η s j m ,(1) j,i based on (9) in the p-th outer iteration. The updated codeword probability η s j m ,(1) j,i is converted to bit LLRs according to (11) and input to the upper turbo decoder of Fig. 3 as a priori LLRs.…”

Section: B Joint Signal Detection and Decodingmentioning

confidence: 99%

“…The SCMA arrangement amalgamated with different channel coding schemes was investigated in [9][10][11][12][13][14][15], as summarised in Table I. To be more specific, an iterative multiuser receiver inspired by the 'turbo' principle for turbo-coded SCMA systems was proposed in [9,15] for increasing the coding gain, especially in the case of heavy user loads.…”

Section: Introductionmentioning

confidence: 99%

“…Joint detection and decoding (JDD) of a low density parity check (LDPC) coded SCMA system was first proposed by Xiao et al [10], which achieves a beneficial performance gain over a separate SCMA detector and LDPC decoder. As a further development, a joint factor graph was designed by Han et al [11] for improving the extrinsic information exchange between the SCMA detector and the LDPC decoder. A similar joint factor graph design was also proposed for a polar-coded SCMA system in [12,13], which improves the BER performance and reduces the detection complexity by relying on an improved polar code construction.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Hybrid Iterative Detection and Decoding of Near-Instantaneously Adaptive Turbo-Coded Sparse Code Multiple Access

Liu

Xiang

Maunder

et al. 2021

IEEE Trans. Veh. Technol.

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Reduced-complexity hybrid detection and decoding (HDD) schemes are conceived for turbo-coded sparse code multiple access (SCMA) by analysing its convergence behavior using extrinsic information transfer (EXIT) charts, which outperforms the state of the art joint detector and decoder (JDD). As a benefit of its carefully controlled complexity, the resultant system is eminently suitable for ultra-reliable low-latency communication (URLLC) in multiuser scenarios, since it requires a low number of turbo iterations between the detector and the decoder. In particular, a pair of HDD schemes are proposed. HDD-I and HDD-II achieve a complexity reduction of up to 25% and 36%, respectively, at a similar bit error rate (BER) performance as that of JDD. Additionally, we propose an adaptive turbo-coded SCMA system for mitigating the influence of multipath propagation so that the system's bits per symbol (BPS) throughput may be improved under favorable channel conditions by using the most appropriate near-instantaneous user load, modulation order and coding rate. Our adaptive system design principle can also be readily used for other channel coding schemes.

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Section: B Joint Signal Detection and Decodingmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Hybrid Iterative Detection and Decoding of Near-Instantaneously Adaptive Turbo-Coded Sparse Code Multiple Access

Liu

Xiang

Maunder

et al. 2021

IEEE Trans. Veh. Technol.

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“…Therefore, improving the error performance of a joint system while reducing the delay and complexity of decoding has become a key research topic. Most of the current research mainly focuses on the turbo code and LDPC code combined with SCMA [24][25][26][27][28][29][30][31][32][33][34][35][36][37][38].…”

Section: Related Workmentioning

confidence: 99%

“…MPA algorithm was divided into the inherent part and the prior part from the perspective of solving edge functions, and MPA algorithm based on the logarithmic form was derived as an approximate algorithm of MAP, which effectively reduced the computational complexity. The authors of [36] combined RNs, joint user nodes (UNs), and check nodes into a joint factor graph to update messages among the three types of nodes. At the same time, the computation complexity was effectively reduced by the Jacobi approximation algorithm.…”

Section: Related Workmentioning

confidence: 99%

A Joint Detection and Decoding Scheme for PC-SCMA System Based on Pruning Iteration

Zhang

et al. 2020

Symmetry

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Polar coding and sparse code multiple access (SCMA) are key technologies for 5G mobile communication, the joint design of them has a great significance to improve the overall performance of the transmitter-receiver symmetric wireless communication system. In this paper, we firstly propose a pruning iterative joint detection and decoding algorithm (PI-JDD) based on the confidence stability of resource nodes. Branches to be updated are dynamically pruned to avoid redundant iterative, which is able to reduce 24~50% complexity while achieving the approximate error performance of traditional serial joint iterative detection and decoding algorithm S-JIDD. Then, to further reduce the bit error rate (BER) of the receiver, a cyclic redundancy check (CRC) termination mechanism is added at the end of each joint iteration to avoid the convergence error caused by decoding deviation. Simulation results show that the addition of an early stopping criterion can achieve a remarkable performance gain compared with the S-JIDD algorithm. More importantly, the combined algorithm of the two proposed schemes can reduce the computational complexity while achieving better error performance.

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Investigating the Effect of Different Channel Coding on the Performance of Sparse Code Multiple Access over AWGN Channel

muhammed

Yousif

2023

Wireless Pers Commun

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A High Performance Joint Detection and Decoding Scheme for LDPC Coded SCMA System

Cited by 20 publications

References 9 publications

Hybrid Iterative Detection and Decoding of Near-Instantaneously Adaptive Turbo-Coded Sparse Code Multiple Access

Hybrid Iterative Detection and Decoding of Near-Instantaneously Adaptive Turbo-Coded Sparse Code Multiple Access

A Joint Detection and Decoding Scheme for PC-SCMA System Based on Pruning Iteration

Investigating the Effect of Different Channel Coding on the Performance of Sparse Code Multiple Access over AWGN Channel

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