Interference minimization approach for distributed beamforming in cognitive two-way relay networks

Safavi, Seyed Hamid; Zadeh, Ramezan Ali Sadegh; Jamali, Vahid; Salari, Soheil

doi:10.1109/pacrim.2011.6032950

Cited by 18 publications

(14 citation statements)

References 21 publications

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“…The process of finding optimum value is described in algorithm (1). In this algorithm, specifies the accuracy of finding the optimal beamforming weights, and we consider it equal to 10 −3 .…”

Section: Sinr Balancingmentioning

confidence: 99%

“…In this strategy users in the system cooperate by relaying each others messages thus improving the communications reliability. Various strategies have been proposed in the literatures based on different relaying techniques, such as amplify-and-forward (AF) [1], decode-and-forward (DF) [2] and etc. Relay beamforming is one of worth strategy that has been proposed for improve the performance of cooperative networks.…”

Section: Introductionmentioning

confidence: 99%

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Distributed beamforming design for SINR balancing approach in cooperative two-way networks based on second-order statistics

Rezvani

Keshavarz

2015

2015 23rd Iranian Conference on Electrical Engineering

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We consider a two-way cooperative network consists of two transceivers and a set of relays. Assuming poor direct link between the two transceivers, they can exchange their data only with help of a set of distributed relays. This paper assumes that second-order statistics (SOS) of channel state information (CSI) is available. In this paper we obtain the complex beamforming weights to achieving signal-to-interference-plus-noise ratio (SINR) balancing in transceivers with total transmit power constraint at the relays. For solving the optimization problem, the complex beamforming weights are optimized with using a bisection search method. Simulation results show that increase in certainty about the channel coefficients helps in achieving a better performance in the two-way cooperative network.Index Terms-two-way networks, distributed beamforming, second-order statistics of CSI, SINR balancing, bisection search method.

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Section: Sinr Balancingmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Distributed beamforming design for SINR balancing approach in cooperative two-way networks based on second-order statistics

Rezvani

Keshavarz

2015

2015 23rd Iranian Conference on Electrical Engineering

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“…Let w diag{W} = [w1, · · · , wR] T , where diag{x} denotes the operation that stacks the diagonal of a matrix in a vector if x is a matrix, or generates a matrix that has the elements of x on the diagonal if x is a vector. Equation (14) can be rewritten as…”

Section: Sinr Maximization With Interference Andmentioning

confidence: 99%

Distributed beamforming for cognitive relay networks

Chen

Zhang

Sun

2014

2014 IEEE China Summit &Amp; International Conference on Signal and Information Processing (ChinaSIP)

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A distributed beamforming technique for half-duplex underlay cognitive relay networks is developed in this paper. The considered cognitive relay network consists of one pair of primary users, one pair of secondary users and multiple relays. With the help of multiple relays, the secondary transmitter sends data to the secondary receiver. In our approach, the receive quality-of-service at the secondary user is maximized while keeping the total relay transmit power and the interference power below a predefined threshold. The resultant problem is shown to have closed-form solutions with certain conditions or can be formulated as a quasi-convex problem, which can be solved efficiently using bi-section search method and secondorder-cone programming. Simulation results demonstrate that the proposed beamforming method improves the system performance.Index Terms-Distributed beamforming, worst-case, cognitive relay networks INTRODUCTIONCognitive radio has recently attracts much interest as it can improve the utilization of wireless spectrum resources, which enables unlicensed users or secondary users to communicate with each other over licensed bands through three main ways. In the interweave approach, the secondary transmitter exploits the spectrum holes of the licensed users or primary users to transmit data [1], [2]. In the overlay method, the secondary user is allowed to operate simultaneously with the primary user over the same spectrum. The transmission of the primary user is improved by employing sophisticated signal processing and coding techniques [3]. In the underlay way, the secondary user and the primary user share the same spectrum simultaneously while the interference power at the primary user is lower than a predefined threshold or interference temperature [2], [4]. Due to the simplicity of the implementation, we consider the underlay approach in this paper.Cooperative relay networks have also attracted much interest in the literature as they can exploit cooperative spatial diversity of different users in the network [5]- [6]. These advantages are introduced by the scheme that different users in relay networks share their communication resources to help each other in data transmission.Since the transmit power of the secondary user is limited to guarantee the quality-of-service (QoS) of the primary user in the underlay approach, it is an attractive choice to employ cooperative relaying techniques in cognitive networks [7]- [15]. The secondary user can operate as a relaying node for the primary user to improve the QoS of the primary user and thus helps to improve the threshold of the interference temperature [7]. The secondary user can also work as a relaying node for other secondary users to improve the receive QoS

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“…For CR networks, an interference minimization approach for distributed AF relay BF with perfect channel state information (CSI) has been introduced in [6]. An SINR balancing and interference minimization AF relay BF approach with imperfect CSI has been also shown in [7].…”

Section: Introductionmentioning

confidence: 99%

Filter-and-forward relay beamforming for OFDM-based cognitive networks

Yang

Miyajima

2014

2014 IEEE International Conference on Communication Systems

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In this paper, filter-and-forward (FF) relay beamforming for orthogonal frequency-division multiplexing (OFDM)-based cognitive two-way relay networks is proposed. In this scheme, two secondary transceivers communicate with each other through multiple relays simultaneously under the primary network transmission over the same spectrum. Our goal is to enhance the quality of service of the secondary network through the maximization of the worst subcarrier signal to interference and noise ratio subject to transmit power constraints. Simulation results show that the proposed FF relay beamforming improves system performance in comparison to the traditional amplify-andforward relaying scheme in OFDM-based cognitive environments.

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Interference minimization approach for distributed beamforming in cognitive two-way relay networks

Cited by 18 publications

References 21 publications

Distributed beamforming design for SINR balancing approach in cooperative two-way networks based on second-order statistics

Distributed beamforming design for SINR balancing approach in cooperative two-way networks based on second-order statistics

Distributed beamforming for cognitive relay networks

Filter-and-forward relay beamforming for OFDM-based cognitive networks

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