On the Performance of Downlink Multiuser Cognitive Radio Inspired Cooperative NOMA

Shokair, Mona; Saad, Waleed; Ibraheem, Shady M.

doi:10.1007/s11277-018-5730-5

Cited by 12 publications

(7 citation statements)

References 20 publications

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“…Since the objective function is highly non-linear and nondifferentiable, we explore the use of simulated annealing (SA) algorithm [22] for solving (20). Indeed, SA is a well known stochastic technique for solving large (but finite) combinational optimisation problems, and has been used extensively for solving network optimisation problems [23].…”

Section: System Outage Probability Minimisationmentioning

confidence: 99%

“…Recently, the NOMA principle has been applied to CR networks as well [17][18][19][20]. In [17], the authors have evaluated the outage performance of CR-NOMA networks with randomly deployed users.…”

Section: Introductionmentioning

confidence: 99%

“…In [19], the authors have evaluated the impact of user pairing on CR inspired NOMA and analysed the sum rates of primary and secondary networks. In [20], the authors have evaluated the achievable capacity of both primary and secondary networks for a CR inspired NOMA network.…”

Section: Introductionmentioning

confidence: 99%

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Ensuring equal outage performance for down‐link secondary users in full/half duplex cognitive NOMA systems

Aswathi

Babu

2020

IET Communications

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Section: System Outage Probability Minimisationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Ensuring equal outage performance for down‐link secondary users in full/half duplex cognitive NOMA systems

Aswathi

Babu

2020

IET Communications

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“…Ding et al evaluate the impact of user pairing on CR‐inspired NOMA and derive analytical expressions for the sum rates of primary and secondary networks. Jeffrey and Zwillinger consider a CR‐inspired cooperative NOMA where the SU acts as relay node for the PU and evaluate the achievable capacity for both primary and secondary networks. From the literature review, it has been observed that the performance of C‐NOMA networks has not been analyzed extensively in the literature by considering scenario where SU near the ST act as relay for SU situated far away from ST.…”

Section: Introductionmentioning

confidence: 99%

Performance analysis of nonorthogonal multiple access‐based underlay cognitive relay network

Aswathi

Babu

2019

Int J Communication

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Summary This paper considers cooperative non‐orthogonal multiple access (NOMA) scheme in an underlay cognitive radio (CR) network. A single‐cell downlink cooperative NOMA system has been considered for the secondary network, consisting of a base station (BS) and two secondary users, ie, a far user and a near user. The BS employs NOMA signaling to send messages for the two secondary users where the near user is enabled to act as a half‐duplex decode‐and‐forward (DF) relay for the far user. We derive exact expressions for the outage probability experienced by both the users and the outage probability of the secondary system assuming the links to experience independent, nonidentically distributed Rayleigh fading. Further, we analyze the ergodic rates of both the users and the ergodic sum rate of the secondary network. The maximum transmit power constraint of the secondary nodes and the tolerable interference power constraint at the primary receiver are considered for the analysis. Further, the interference caused by the primary transmitter (PT) on the secondary network is also considered for the analysis. The performance of the proposed CR NOMA network has been observed to be significantly better than a CR network that uses conventional orthogonal multiple access (OMA) scheme. The analytical results are validated by extensive simulation studies.

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“…After applying some algebraic manipulations, the method of undetermined coefficients as used in [57][58][59] where…”

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confidence: 99%

Secrecy Enhancement of Cooperative NOMA Networks With Two-Way Untrusted Relaying

et al. 2020

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The two-way relaying (TWR) technique has been confirmed to achieve higher spectral efficiency and average sum rate compared with the one-way relaying (OWR) technique in ultra-dense next generation networks with limited spectal resources. In this paper, an enhanced secrecy cooperative TWR scheme for cooperative non-orthogonal multiple access (NOMA) networks against untrusted relaying is highlighted. Specifically, with the application of NOMA principle, a base station (Bs) communicates with two trusted users, i.e., namely a near and a far users, where the communication with the far user takes place only via an untrusted relay (UR) employing both TWR and analog network coding (ANC) mechanisms. To minimize information leakage at the UR, the far user transmits its uplink signal simultaneously with Bs's downlink signal to confuse the eavesdropping capability of the UR by increasing inter-user interference (IUI). To investigate the benefits of the proposed scheme, asymptotic lower bound expressions of the ergodic secrecy sum rate (ESSR) of uplink/downlink rates and their scaling law are derived to characterize the secrecy performance. The system parameters have been carefully studied to maitain the desired ESSR performance where we obtain an optimal value for the uplink power sharing coefficient with an arbitrary known value of the downlink one. Analytical and simulation results show that the proposed scheme can achieve scaling gain of 1 8 ln ρ of positive ESSR over the untrusted OWR scheme with adaptive uplink/downlink jamming and a significant gain over the other conventional NOMA uplink/downlink schemes in two time slots of communication.

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On the Performance of Downlink Multiuser Cognitive Radio Inspired Cooperative NOMA

Cited by 12 publications

References 20 publications

Ensuring equal outage performance for down‐link secondary users in full/half duplex cognitive NOMA systems

Ensuring equal outage performance for down‐link secondary users in full/half duplex cognitive NOMA systems

Performance analysis of nonorthogonal multiple access‐based underlay cognitive relay network

Secrecy Enhancement of Cooperative NOMA Networks With Two-Way Untrusted Relaying

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