Network Coding Schemes with MIMO-NOMA for Two-Way Relay Networks

Journal of Electrical Engineering

Haldar

et al. 2020

Self Cite

The aim of this paper proposes an orthogonal frequency-division multiplexing (OFDM) with network coding to improve the error performance of the system when the messages are transmitted from user to receiver. Two-way relay (TWR) networks are applied to reduce the transmission time slots. The exclusive-OR (XOR) coding is used for network coding in which source nodes exchange their information via TWR nodes. The XOR coded bits provides redundancy to achieve the transmit diversity gain which improves the error performance of the TWR network. OFDM is exploited for TWR to obtain the frequency selective fading nature of wireless channels. The different modulation schemes such as Quadrature Phase Shift Keying (QPSK), 16-Quadrature Amplitude Modulation (QAM) and 64-QAM with OFDM system are simulated and QPSK is selected as it gives the lowest bit error rate (BER). The multiple relaying schemes with different numbers of the information packets are also considered in this paper. Simulation results show that multiple relay schemes provide faster transmission time and better error rate performance. Moreover, different kinds of channel coding schemes such as Convolutional, Reed-Solomon (RS) and turbo codes are applied in OFDM system with network coding to compare and evaluate the BER performance of the proposed system. From the simulation results, network coded OFDM scheme with turbo codes give better BER performance for given Signal-to-Noise Ratio (SNR) in relaying scheme with different numbers of information packets compared to those of convolutional and RS codes. It shows that, the error rate performance and transmission time is reduced 10 percent than the conventional scheme at even at low SNR value.

Section: Ofdm Receivermentioning

confidence: 99%

Investigation of error performance in OFDM with network coding techniques in multiple relay networks

Hlaing¹,

Journal of Electrical Engineering

Haldar

et al. 2020

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“…Adding PNC to the system allowed a greater increase than MIMO. Figure 2 shows the block diagram of different time slots for a transmission scheme in conventional bi-directional relay and PNC relay [14].…”

Section: Physical Layer Network Coding (Pnc)mentioning

confidence: 99%

“…For MMSE, (11) will be applied for the simulation of SIC to determine the error in the channel which is based on [14]. x'…”

Section: Quaternary Phase Shift Keying (Qpsk)mentioning

confidence: 99%

“…To estimate signal for x 1 , the value for x 2 will be subtracted from the wireless network system. [19].…”

Section: Quaternary Phase Shift Keying (Qpsk)mentioning

confidence: 99%

“…In (19), the hard decision is taken. After the second layer signal x 2 has been detected, the first layer of PNC can be applied by the help of x 2 .…”

Section: Quaternary Phase Shift Keying (Qpsk)mentioning

confidence: 99%

See 2 more Smart Citations

Investigation of error performance in network coded MIMO-VBLAST wireless communication systems

Journal of Electrical Engineering

Hlaing

Kong

et al. 2019

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Paper aims to enhance the performance of bit error rate (BER) in wireless communication based on the multiple-input multiple-output (MIMO) system of vertical Bell laboratories layered space-time (VBLAST) algorithm. The VBLAST algorithm uses zero-forcing (ZF) and the minimum mean square error (MMSE) to evaluate the BER of wireless communication. MIMO VBLAST techniques function as an adaptive filter and can minimize the interference and multipath fading in the received signal of the channel. Physical layer network coding (PNC) is a new technique used to exploit the spatial diversity of the MIMO VBLAST system to improve the throughput and performance of wireless communication. The bit-error-rate (BER) of proposed VBLAST MIMO with PNC with binary phase-shift keying (BPSK) and quadrature phase-shift keying (QPSK) modulation over the additive white Gaussian noise and Rayleigh fading channel are analyzed. The performance of both BPSK and QPSK modulation in two and four antennas are compared. From the simulation results, it was found that the proposed scheme MIMO VBLAST PNC has a 45.2 % higher BER performance compared to the traditional MIMO scheme with an increase in the BER using MMSE and ZF respectively in both two and four antennas.

Network‐coded MIMO‐NOMA systems with FEC codes in two‐way relay networks

Hlaing

Mariappan

et al. 2020

Int J Communication

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Summary This paper assumes two users and a two‐way relay network with the combination of 2×2 multi‐input multi‐output (MIMO) and nonorthogonal multiple access (NOMA). To achieve network reliability without sacrificing network throughput, network‐coded MIMO‐NOMA schemes with convolutional, Reed‐Solomon (RS), and turbo codes are applied. Messages from two users at the relay node are network‐coded and combined in NOMA scheme. Interleaved differential encoding with redundancy (R‐RIDE) scheme is proposed together with MIMO‐NOMA system. Quadrature phase‐shift keying (QPSK) modulation technique is used. Bit error rate (BER) versus signal‐to‐noise ratio (SNR) (dB) and average mutual information (AMI) (bps/Hz) versus SNR (dB) in NOMA and MIMO‐NOMA schemes are evaluated and presented. From the simulated results, the combination of MIMO‐NOMA system with the proposed R‐RIDE‐Turbo network‐coded scheme in two‐way relay networks has better BER and higher AMI performance than conventional coded NOMA system. Furthermore, R‐RIDE‐Turbo scheme in MIMO‐NOMA system outperforms the other coded schemes in both MIMO‐NOMA and NOMA systems.