Optimal Relay Selection and Power Allocation for Cognitive Two-Way Relaying Networks

Ubaidulla, P.; Aı̈ssa, Sonia

doi:10.1109/wcl.2012.032312.120095

Cited by 127 publications

(86 citation statements)

References 11 publications

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“…The applications of cooperative communication approaches in the context of CR networks have been discussed in [1], [28]- [35], [35]- [42]. Cooperative transmission can greatly improve the spectrum access opportunity as well as sharing efficiency for CUs with the help of cooperative RN.…”

Section: Introductionmentioning

confidence: 99%

Cooperative Overlay Spectrum Access in Cognitive Radio Networks

Liang

Hanzo

2017

IEEE Commun. Surv. Tutorials

119

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Abstract-In order to mitigate the shortage of wireless spectrum, the appealing concepts of cooperative communication techniques and cognitive radio networks have been combined for the sake of improving the spectral efficiency and hence the overall system throughput. We mainly survey the overlay spectrum access scheme in this novel cooperative cognitive radio (CCR) network context. Therefore the interference between the Licensed Users/Primary Users (PUs) and the Unlicensed Users/Cognitive Users (CUs) can be offset by relying on some of the CUs to act as Relay Nodes (RN). More specifically, we have investigated the cooperative relaying technique in the context of the overlay spectrum access scheme aiming for allowing the PUs to transmit at a lower power and/or at a higher throughput, while at the same time enabling the CUs to communicate using the bandwidth released. Additionally, gaming techniques can be employed for negotiating between the PUs and the CUs for determining the specific fraction of relaying and active transmission time. Therefore, we will consider two main schemes in the overlay spectrum access scheme based on the CCR network, which are the frequency division based channel as well as the timedivision based channel. Moreover, we have surveyed the relevant advances concerning the game-based model of the overlay-based CR network. Specifically, both the family of non-cooperative and cooperative games as well as matching games have been reviewed. Furthermore, we will review the joint design of coding, modulation, user-cooperation and CCR techniques, which leads to significant mutual benefits for both the PUs and CUs.

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Section: Introductionmentioning

confidence: 99%

Cooperative Overlay Spectrum Access in Cognitive Radio Networks

Liang

Hanzo

2017

IEEE Commun. Surv. Tutorials

119

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“…More recently, two-way relaying (TWR) technique has drawn a lot of attention due to fully compensating this loss by permitting two users concurrently transmit its signal to each other with the help of half-duplex relays [6]. Despite getting higher spectral efficiency than the traditional cognitive one-way relay networks, only few works investigated the performance of twoway counterpart [7][8][9][10][11][12]. The performance of two-way relaying with single and multiple relays has been reported in [7] and [9], respectively.…”

Section: Introductionmentioning

confidence: 99%

“…In [10], the tight lower bound of user outage performance of in multiple primary users environment has been obtained in two cases, i.e., two users and two group of users. The optimal relay selection for two-way cognitive relay networks has been discussed in [11,12]. In addition, relay selection combined with power allocation for two-way relaying in the presence of imperfect channel state information (CSI) were studied in [13,14].…”

Section: Introductionmentioning

confidence: 99%

Cooperative Spectrum-Sharing with Two-Way AF Relaying in the Presence of Direct Communications

Thanh¹,

Hoang²

2018

EAI Endorsed Transactions on Industrial Networks and Intelligen

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In this paper, we investigate a three-phase two-way (TW) amplify-and-forward (AF) relaying for cognitive radio networks. By utilizing the direct communications, the end user can employ diversity combining techniques, i.e., maximal ratio combining (MRC) and selection combining (SC), to achieve the full diversity. We derive the closed-form and asymptotic expressions for user and system outage probabilities which allows us to highlight the advantage of cooperative cognitive communications. The numerical results, obtained through compact forms of these outage probabilities, yield that the cognitive TW AF relaying scheme can significantly enhance the reliability of unlicensed networks in which the transmit power at secondary users is strictly governed.

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“…In cognitive two-way networks, closed-form solutions for optimal PA were derived in [16] under the joint peak interference constraint for PU. For cognitive two-way relaying networks, optimal PA and relay selection scheme were studied in [17], where a pair of secondary transceivers communicate with each other assisted by a set of two-way AF relays. Further, the problem of relay selection and PA for the two-way relaying cognitive radio networks was investigated in [10], where the relays select between the AF and decode-and-forward (DF) protocols to maximize SU's sum rate.…”

Section: Introductionmentioning

confidence: 99%

Optimal resource allocation for cognitive radio networks with primary user outage constraint

Lan

Chen

Zhang

et al. 2015

J Wireless Com Network

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In this paper, we investigate the problem of power allocation in cognitive underlay networks, where a secondary user (SU) is allowed to coexist with a primary user (PU). We consider three transmission models for the secondary link: (i) one-way transmission with relay assisted, (ii) two-way transmission with a direct link, and (iii) two-way transmission with relay assisted. In conventional interference-limited cognitive networks, the instantaneous channel state information (CSI) of a PU is required to suppress SU's transmit power to guarantee the quality of service (QoS) of the PU, which increases the feedback burden in practice. To tackle this issue, in this article we take primary outage probability as a new criterion to measure the QoS of the PU, where only the statistical CSI of the PU is required. Firstly, we derive the primary outage constraints for the three models, respectively. Then, with the newly obtained constraints, we formulate optimization problems to maximize the channel rate of the SU. Finally, we derive the optimal solutions for power allocation with respect to different parameters, respectively. Simulation results verify the performance improvement of the proposed schemes.

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Optimal Relay Selection and Power Allocation for Cognitive Two-Way Relaying Networks

Cited by 127 publications

References 11 publications

Cooperative Overlay Spectrum Access in Cognitive Radio Networks

Cooperative Overlay Spectrum Access in Cognitive Radio Networks

Cooperative Spectrum-Sharing with Two-Way AF Relaying in the Presence of Direct Communications

Optimal resource allocation for cognitive radio networks with primary user outage constraint

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