Network coding schemes with efficient LDPC coded MIMO–NOMA in two-way relay networks

The combination of non-orthogonal multiple access (NOMA) and multi-input multi-output (MIMO) approaches has been considered as assuring multiple access for the fifth generation technology. In this study, the performance of a $2\times 2$2×2 MIMO–NOMA system with low-density parity check (LDPC) codes...

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Bibliographic Details
Published in:IET communications Vol. 14; no. 2; pp. 337 - 348
Main Authors: War Hlaing, Ngu, Farzamnia, Ali, Mariappan, Muralindran, Kumar Haldar, Manas
Format: Journal Article
Language:English
Published: The Institution of Engineering and Technology 17.01.2020
Subjects:
2\times 2$2×2 MIMO–NOMA
bit‐flipping decoder
conventional LDPC
decoding
decoding methods
efficient LDPC
encoding
error statistics
exclusive‐OR coded information
hard‐decision decoding
LDPC decoding
LDPC encoded messages
LDPC–R‐RIDE
low‐density parity check codes
MIMO communication
MIMO–NOMA system
multiinput multioutput approaches
network coding schemes
nonorthogonal multiple access
parity check codes
Research Article
R‐RIDE–LDPC
simplified log‐domain decoders
simplified log‐domain decoding
soft‐decision decoding
network coding schemes
nonorthogonal multiple access
parity check codes
hard-decision decoding
MIMO–NOMA system
encoding
decoding
multiinput multioutput approaches
low-density parity check codes
simplified log-domain decoding
exclusive-OR coded information
efficient LDPC
2\times 2$2×2 MIMO–NOMA
LDPC encoded messages
LDPC decoding
R-RIDE–LDPC
conventional LDPC
soft-decision decoding
bit-flipping decoder
simplified log-domain decoders
MIMO communication
decoding methods
error statistics
LDPC–R-RIDE
ISSN:1751-8628, 1751-8636
Online Access:Get full text
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Summary:The combination of non-orthogonal multiple access (NOMA) and multi-input multi-output (MIMO) approaches has been considered as assuring multiple access for the fifth generation technology. In this study, the performance of a $2\times 2$2×2 MIMO–NOMA system with low-density parity check (LDPC) codes is investigated. Redundancy with randomly interleaved differential encoding (R-RIDE) is proposed and applied to LDPC encoded messages by two users. LDPC decoding is done using the sum-product algorithm (SPA), which has two types of decoding methods, hard-decision and soft-decision. For hard-decision, bit-flipping decoder is used and for soft-decision, probability domain, log-domain, and simplified log-domain decoders are used. Bit error rate (BER) versus signal-to-noise ratio (SNR) in (dB) and average mutual information (AMI) in (bps/Hz) versus SNR (dB) are evaluated to compare the performance of the proposed and conventional LDPC schemes in NOMA and MIMO–NOMA systems. Simulation results show that both AMI and BER of the proposed LDPC–R-RIDE in MIMO–NOMA system greatly outperforms conventional LDPC coded schemes in NOMA and MIMO–NOMA systems. Moreover, the proposed R-RIDE-LDPC in MIMO-NOMA system outperforms the proposed scheme in the NOMA system. From the simulation results, LDPC–R-RIDE with simplified log-domain decoder has the best AMI result and BER performance compared with other decoding methods.
ISSN:1751-8628
1751-8636
DOI:10.1049/iet-com.2019.0503