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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Vydané v:	IET communications Ročník 14; číslo 2; s. 337 - 348
Hlavní autori:	War Hlaing, Ngu, Farzamnia, Ali, Mariappan, Muralindran, Kumar Haldar, Manas
Médium:	Journal Article
Jazyk:	English
Vydavateľské údaje:	The Institution of Engineering and Technology 17.01.2020
Predmet:	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
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Shrnutí:	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