Power Allocation and Relay Selection for Cognitive Relay Networks with Primary QoS Constraint

Lan, Peng; Sun, Fenggang; Chen, Lizhen; Xue, Peng; Hou, Jialin

doi:10.1109/wcl.2013.080813.130469

Cited by 24 publications

(16 citation statements)

References 10 publications

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“…Considering that obtaining channel state information (CSI) at secondary system is hard, 30,31 and that cooperation between PUs and SUs is explicit, which PUs are aware of, therefore, PUs provide SUs with CSI. As a result, SUs may achieve different values of data rate although they all have equal access period τ.…”

Section: System Modelmentioning

confidence: 99%

A Stackelberg game for relay selection and power allocation in an active cooperative model involving primary users and secondary users

Ghanem

Sabaei

Dehghan

2018

Int J Communication

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In recent years, cooperative communications have been widely used to improve the spectrum efficiency in cognitive radio networks. In this paper, we propose a new cooperative model involving primary and secondary users, where a primary transmitter may select a number of the secondary users to act as relays in order to maximize its data rate and to transmit at lower energy level, thereby saving energy and reducing interference at the secondary base station. The cooperative transmission is a multiple two-hop relaying scheme, which guarantees an achievable data rate exceeding that in the direct transmission. In the proposed approach, the problem of joint relay selection and power allocation is formulated as a Stackelberg game, which converges to a unique optimal Nash equilibrium. Performance evaluation shows that this model offers benefit to both sides, where the primary users achieve higher data rate at lower energy consumption and the signal to interference plus noise ratio at the secondary base station is increased significantly. In addition, the results show that the proposed solution outperforms the investigated models in terms of achievable data rate.

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Section: System Modelmentioning

confidence: 99%

A Stackelberg game for relay selection and power allocation in an active cooperative model involving primary users and secondary users

Ghanem

Sabaei

Dehghan

2018

Int J Communication

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“…The direct calculation of (19a) and (19b) yields the optimal solutions of the equivalent powers P opt S1 (i) and P opt SR i as From the derived solution (20), the optimal powers of S1 and SR can be allocated. Different from the ERA scheme in (15), the powers of S1 and SR i are decided not only by the QoS requirement of PU and the average channel gain of the links from PT to PD and from itself to PD but also by the instantaneous channel gain of the secondary link.…”

Section: Optimal Power Allocationmentioning

confidence: 99%

“…To be more specific, if the average channel gain of one interference link is dominantly stronger that the another, without loss of generality, we assume λ S1 is larger than λ SR i . According to (20), the proposed scheme will suppress the transmit power of S1 but allocate more power to SR i without violating the primary outage constraint. However, the ERA scheme only suppresses the power of S1 when λ S1 is larger than λ SR i .…”

Section: Optimal Power Allocationmentioning

confidence: 99%

“…In the TWT-DL model, we enhance the secondary transmission by power allocation, and the two different goals are as follows: (1) to maximize the sum achievable (20) rate and (2) to maximize the achievable rate of the weaker link which is referred as to guarantee fairness.…”

Section: Power Allocation For the Twt-dl Modelmentioning

confidence: 99%

“…In [19], the authors introduced a new cooperative transmission scheme for overlay cognitive radio in which the secondary network exploits the primary retransmissions without requiring global CSI. Further in [20], the primary outage constraint due to secondary transmitter and secondary relay was jointly considered for the first time, and a closed-form solution for optimal PA and relay selection was derived in DF cognitive relay networks.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

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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Study on cognitive DF relaying cooperation with the mutual interference between primary and secondary users over Nakagami‐m fading channels

Jia

Deng

Yang

et al. 2014

Int J Communication

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Summary In this paper, the cognitive relay cooperation (CRC) wireless communication systems are investigated over Nakagami‐m fading channels. The decode‐and‐forward (DF) relay is employed to assist the communications between cognitive source and destination. Especially, to achieve full diversity order, we consider the case in which there is a direct path between cognitive source and destination. Besides the interference at primary users (PUs) created by secondary users (SUs), the interference at SUs created by PUs is also considered. For the interested CRC systems, we first achieve the exact expression for the CDF of the equivalent end‐to‐end signal‐to‐interference ratio (SIR) of CRC systems. Then, with the exact CDF, the exact average symbol error ratio (SER) and outage performance of CRC systems are achieved. The derivation is of significance, by which we can obtain a detailed knowledge about CRC systems. Though a single integral included in the derivation, it can be calculated numerically by employing some mathematical tools such as Matlab. At the same time, to obtain the insight and highlight the effect of system parameters on the considered CRC systems, by using the high SIR approximation, we obtain the asymptotic closed‐form expression of CDF as well as the ones of average SER and outage probability. From the asymptotic results, we can find the main factors that dominate the performance of CRC systems. The presented simulation results for outage probability and average SER show the derivations and simulations are in agreement. Moreover, in high SIR the achieved asymptotic results match well the exact ones. As a result, in high SIR we can employ the asymptotic closed‐form solutions to evaluate the exact performance of CRC systems. This can reduce greatly the implementation complexity. Besides this, the simulations also show that the diversity order is dominated by the fading severities of the secondary systems, i.e. the diversity order be proportional to the summation of the minimum fading severity between the two hops and that of the direct link. In contrast, the parameters of the primary systems only affect the coding gain, not the diversity gain. Copyright © 2014 John Wiley & Sons, Ltd.

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Power Allocation and Relay Selection for Cognitive Relay Networks with Primary QoS Constraint

Cited by 24 publications

References 10 publications

A Stackelberg game for relay selection and power allocation in an active cooperative model involving primary users and secondary users

A Stackelberg game for relay selection and power allocation in an active cooperative model involving primary users and secondary users

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

Study on cognitive DF relaying cooperation with the mutual interference between primary and secondary users over Nakagami‐m fading channels

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