Precoder Design and Power Allocation for MIMO Cognitive Radio Two-Way Relaying Systems

Sboui, Lokman; Ghazzai, Hakim; Rezki, Zouheir; Alouini, Mohamed‐Slim

doi:10.1109/tcomm.2016.2599520

Cited by 9 publications

(6 citation statements)

References 36 publications

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“…The objective function (17) is nonconvex due to the existing of sum rate. The third term of R * tot is expanded by the first-order Taylor formula, which approximates as an affine function.…”

Section: A Optimization Of Twr Transmission Powermentioning

confidence: 99%

“…The TWR only needs two time slots to complete the information exchange between two users [16]. [17] studied a multiple-antenna TWR cognitive radio system. In order to reduce the interference to the PU, a space alignment (SA) technique was adopted by the SUs.…”

Section: Introductionmentioning

confidence: 99%

“…The precoder design and power allocation were designed to maximize the sum rate of the cognitive network. Based on [17], the precoding and decoding matrixes were considered to improve system throughput [18]. In order to further improve the SINR of SUs, the authors of [19] studied the cognitive beamforming in underlay TWR networks with multiple antenna terminals and proposed a bisection search based joint optimal algorithm.…”

Section: Introductionmentioning

confidence: 99%

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Energy Efficiency Maximization for Two-Way Relay Assisted CR-NOMA System Based on SWIPT

2019

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Cognitive radio (CR) and non-orthogonal multiple access (NOMA) have been deemed two promising technologies due to their potential to achieve a high spectral efficiency and massive connectivity. In this paper, the energy efficiency (EE) is investigated in a two-way relay assisted cognitive radio non-orthogonal multiple access (CR-NOMA) network. Our objective is to maximize the EE of the SU system subject to harvested energy and the quality of service (QoS) of the users. Specifically, the multiobjective optimization problem is decomposed into three subproblems, i.e., the optimization of transmit power, power allocation, and power splitting ratio, respectively. The problem with optimizing transmit power is non-convex; hence, the Lagrange dual algorithm based on the first-order Taylor series expansion function is proposed to solve it. Besides, the multi-objective iterative algorithm (MOIA) is further proposed to achieve joint optimal solution. The simulation result shows that compared with the traditional OWR, the proposed scheme not only improves the spectral efficiency but also increases the EE of SUs by 45%. INDEX TERMS Cognitive radio, energy efficiency, NOMA, power allocation, two-way relay.

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Section: A Optimization Of Twr Transmission Powermentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Energy Efficiency Maximization for Two-Way Relay Assisted CR-NOMA System Based on SWIPT

2019

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“…In the rest of this paper, we denote these users by "relays". We assume that each relay can serve only one user at a time using the same RB and two-way relaying [30]. As a result, the uplink communication is affected by the interference coming from all users and relays in neighbor SCs that are using the same RB.…”

Section: System Model and Problem Formulationmentioning

confidence: 99%

Balancing D2D Communication Relayed Traffic Offloading in Multi-Tier HetNets

Omran¹,

Kadoch²

2019

IJCNS

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In Heterogeneous Networks (HetNets), Integrating Device-to-Device communication (D2D) techniques presents as a promising solution for improving system performance by offloading traffic from heavily loaded macro cell (MC) to small cells (SCs). For instance, D2D can be used to offload traffic from heavily-loaded cells to light-loaded small cells. However, offloading new users may result in an unfair load distribution among small cells and consequently may affect the quality of service of some users. To achieve better performance and reduce blocking probability load balancing among small cells should be considered when we offload traffic from macro to small cells. In this paper, we consider a centralized offloaded relay selection scheme, in which a cellular provider can decide whether users can assist each other to relay their traffic to small cells. We propose a joint user-relay selection with dynamic load balancing scheme based on D2D communications using the Kuhn-Munkres (K-M) method. The offloading process considers the load from MC to SCs and among SCs. Compared to previous works, our simulation results show that the proposed scheme increases the number of admitted users in the system, and achieves a higher load balancing fairness index among small cells. Also, our scheme achieves a higher rate fairness index among users by adjusting the signal to interference plus noise ratio (SINR) threshold.

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“…Several approaches have been proposed in the literature, among which beamforming, space-time precoding and antenna switching/selection figure prominently as MIMOenabled techniques that can efficiently sort out the dilemma of co-existence on the same spectrum band [2], [3], [4]. From a cost-effective implementation perspective, beamforming and space-time precoding require large feedback overhead and several radio-frequency chains compared to TAS as a form of antenna selection diversity scheme.…”

Section: Introductionmentioning

confidence: 99%

Optimal TAS for Cross-Interference Mitigation in Cognitive MIMO MRC Systems

El-Moutaouakkil

Tourki

Saoudi

et al. 2019

2019 15th International Wireless Communications &Amp; Mobile Computing Conference (IWCMC)

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In a cost-effective implementation, we address the problem of cross-interference in cognitive multiple-input multiple-output (MIMO) spectrum sharing where mutual cochannel interference (CCI) between the primary and secondary systems is of major concern. First, we propose an optimal transmit-antenna selection (TAS) strategy that instead maximizes the received signal-to-interference-plus-noise ratio (SINR) after maximum-ratio combining (MRC). We statistically analyze the combined SINR structure and derive new expressions of its cumulative and probability distribution functions. Interestingly, we accurately show the substantial gains offered by the proposed TAS strategy in terms of the secondary system outage performance compared to the existent state-of-the-art TAS strategies. Finally, our analytical results are validated by simulations and some important insights are also underlined.

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Precoder Design and Power Allocation for MIMO Cognitive Radio Two-Way Relaying Systems

Cited by 9 publications

References 36 publications

Energy Efficiency Maximization for Two-Way Relay Assisted CR-NOMA System Based on SWIPT

Energy Efficiency Maximization for Two-Way Relay Assisted CR-NOMA System Based on SWIPT

Balancing D2D Communication Relayed Traffic Offloading in Multi-Tier HetNets

Optimal TAS for Cross-Interference Mitigation in Cognitive MIMO MRC Systems

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