Backscatter Assisted NOMA-PLNC Based Wireless Networks

Rajkumar, Samikkannu; Jayakody, Dushantha Nalin K.

doi:10.3390/s21227589

Cited by 7 publications

(2 citation statements)

References 29 publications

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“…It is assumed that the transmitted signals are not aligned at the receiver, and hence the channel is symbol asynchronous. Therefore, a power domain A-NOMA schemeassisted decoding method is applied in our proposed work where the waveform technique used is based on Orthogonal Frequency Division Multiplexing (OFDM) [12], [16], [17], [19], [30], [31].…”

Section: System Modelmentioning

confidence: 99%

M-Ary QAM Asynchronous-NOMA D2D Network With Cyclic Triangular-SIC Decoding Scheme

et al. 2023

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The complexity of successive interference cancellation at the receiver's end is a challenging issue in conventional non-orthogonal multiple access assisted massive wireless networks. The computational complexity of decoding increases exponentially with the number of users. Further, under realistic channel conditions, a synchronous non-orthogonal multiple access scheme is impractical in the uplink deviceto-device communications. In this paper, an asynchronous non-orthogonal multiple access-based cyclic triangular successive interference cancellation scheme is proposed for a massive device-to-device network. The proposed scheme reduces the decoding complexity, energy consumption, and bit error rate of a superimposed signal received in an outband device-to-device network. More specifically, the scheme follows three consecutive stages; optimization, decoding, and re-transmission. In the optimization stage, a dual Lagrangian objective function is defined to maximize the number of data symbols decoded at the receiver by determining an optimal interference cancellation triangle, under the co-channel interference and data rate constraints. In the decoding stage, the data in the optimal interference cancellation triangle is decoded using a conventional triangular successive interference cancellation technique. Next, the remaining users' data are decoded in sequential iterations of the proposed scheme, using the retransmissions from such users. Utilizing the successive interference cancellation characteristics, the performance of the proposed deviceto-device network is defined in terms of energy efficiency, bit error rate, computational complexity, and decoding delay metrics. Moreover, the performance of the proposed decoding scheme is compared with the conventional triangular successive interference cancellation decoding scheme to demonstrate the superiority of the proposed scheme.

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Section: System Modelmentioning

confidence: 99%

M-Ary QAM Asynchronous-NOMA D2D Network With Cyclic Triangular-SIC Decoding Scheme

et al. 2023

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“…Generally, the NOMA scheme is easily adopted with downlink transmission [15], [16]. However, the end-to-end transmission of the NOMA wireless network is established by combining the physical-layer network coding (PLNC) scheme as in [17] and [18]. Inherently, the NOMA scheme is well suited for the VLC networks due to the quality of channel state information (CSI), which makes successive interference cancellation (SIC) operations more flexible.…”

Section: A Review On Multiple Access Techniques In Vlcmentioning

confidence: 99%

Game Theory Based Delta-OMA Scheme for VLC Networks

Tennakoon¹,

Rajkumar

Jayakody³

2023

IEEE Access

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This paper proposes a delta-orthogonal multiple access (D-OMA) scheme-based visible light communications (VLC) network to enhance spectral efficiency and massive connectivity in the indoor environment. The D-OMA scheme is an advanced version of the non-orthogonal multiple access (NOMA) scheme. D-OMA allows the partial overlapping of the in-band NOMA clusters to achieve the benefits of a massive in-band NOMA scheme with low power consumption and less complexity. In this work, the massive in-band NOMA scheme is used as a special case of the proposed D-OMA scheme. Game theory is employed for the user grouping mechanism, which enhances the sum rate of the proposed network. Closed-form expressions for the bit error rate (BER) and outage probability of the proposed network are derived. Further, downlink transmission power optimization is performed using Karush-Kuhn Tucker (KKT) conditions to improve the outage performance of the proposed D-OMA VLC network. The presented numerical results show the effect of optical filter gain and field of view (FoV) in indoor communication. Further, it is noted that the BER performance of the D-OMA scheme outperforms the massive in-band NOMA scheme due to the cluster sizes which control the interference in the D-OMA scheme. Moreover, the sum rate of the proposed network is significantly improved using the preference relation algorithm (PRA) compared to the random NOMA scheme.INDEX TERMS Delta-orthogonal multiple access, massive in-band NOMA, visible light communications.PRIYASHANTHA TENNAKOON (Member, IEEE) received the B.Sc. degree (Hons.

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