Power allocation and outage probability analysis for secondary users in cognitive full duplex relay systems

Kim, Hyung-Jong; Lim, Sungmook; Wang, Hano; Hong, Daesik

doi:10.1109/spawc.2012.6292947

Cited by 11 publications

(5 citation statements)

References 9 publications

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“…Most existing studies for complex cooperative relay network are based on HD assumption, there have been very few works on the use of the FD mode because of the late proposition of this practical FD technique [177][178][179][180][181][182]: In [177,178], FD in cognitive radio networks is studied. For PRC, FD relay selection is studied in [179].…”

Section: Fd Relaymentioning

confidence: 99%

Survey on cooperative strategies for wireless relay channels

Dai

Wang

Zhang

et al. 2014

Trans. Emerging. Tel. Tech.

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Cooperative communication has the potential of providing better throughput and reliability to wireless systems when compared with direct communication. To realise the potential gain, it is important to design cooperative strategies for some representative scenarios. This survey deals with three basic wireless relay channels, namely, the parallel relay channel, the multiple‐access relay channel and the broadcast relay channel. For the first channel, which models a single unicast connection, various forwarding strategies are studied. For the second and third channels, which model, respectively, the uplink and downlink scenarios with multiple unicast connections; network codes that exploit the possibility of coding among the connections are studied. The common aim pertaining to the studies of all these three channels is to use the limited radio resource in the most efficient way. Beside the aforementioned conventional works, studies that have state‐of‐the‐art assumptions for relay networks, including outdated channel state information at the transmitter, full duplex relay and practical rateless‐coded cooperation, are also extensively reviewed. Copyright © 2014 John Wiley & Sons, Ltd.

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Section: Fd Relaymentioning

confidence: 99%

Survey on cooperative strategies for wireless relay channels

Dai

Wang

Zhang

et al. 2014

Trans. Emerging. Tel. Tech.

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“…Also, [31], [17] considered maximum peak interference constraints, while we focus on a different rate-driven QoS constraint. In [32], [33], [18], [34], the interference from the licensed network does not impact the opportunistic network, as opposed to our model.…”

Section: Introductionmentioning

confidence: 99%

Full-Duplex Relaying for Opportunistic Spectrum Access Under an Overall Power Constraint

Savard

Belmega

2020

IEEE Access

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To meet the bold requirements of future generation networks, emerging technologies such as opportunistic spectrum access, multi-tier networks, full-duplexing and cooperative networks have to be exploited. In this paper, we propose to blend all the above and globally optimize a relay-aided cognitive radio network composed of a licensed link and an opportunistic link, which is helped by a full-duplex relay node. The opportunistic transmission is allowed provided that a minimum Quality of Service (QoS) constraint is met at the licensed user. First, we derive the achievable rate region under two relaying schemes, namely Decode-and-Forward (DF) and Compress-and-Forward (CF). Then we investigate the optimal power allocation policies for the opportunistic user and the relay under an overall power constraint. The resulting optimization problems are non-convex programs because of the non-trivial operations at the relay (for both CF and DF) and, for DF relaying, the non-convex QoS constraint. Remarkably, the optimal solution is stated in closed-form for CF, whereas it is obtained numerically for DF. Finally, we evaluate numerically the network performance under the two relaying schemes. It turns out that DF outperforms CF only when the relay is close to the opportunistic transmitter and that CF relaying is always useful. INDEX TERMS Full-duplex relaying, opportunistic spectrum access, optimal power allocation

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“…Finally, all these works consider peak interference constraints to protect the primary link, while we focus on a minimum QoS constraint. Other works including [17]- [20] consider relay-aided cognitive radio networks such that no interference from the primary network impacts the secondary network, which we do not ignore here.…”

Section: Introductionmentioning

confidence: 99%

Optimal power allocation policies in multi-hop cognitive radio networks

Savard¹,

Belmega²

2020

2020 IEEE 31st Annual International Symposium on Personal, Indoor and Mobile Radio Communications

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This paper investigates a power allocation problem in an optimal and closed-form manner for a relay-aided cognitive network composed of one primary and secondary user/destination pair (e.g., a cellular link coexisting with a device-to-device link in a device-to-device enabled cellular communication setup) and one secondary full-duplex relay. By exploiting the monotonic properties of the objective function and the geometry of the feasible set, we provide the optimal and closed-form power allocation policy assuming the relay performs either Decodeand-Forward (DF) or Compress-and-Forward (CF). We then conjecture that if the secondary direct link is missing, then DF always outperforms CF, irrespective from the system parameters. This conjecture is sustained by numerous numerical simulations.

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Power allocation and outage probability analysis for secondary users in cognitive full duplex relay systems

Cited by 11 publications

References 9 publications

Survey on cooperative strategies for wireless relay channels

Survey on cooperative strategies for wireless relay channels

Full-Duplex Relaying for Opportunistic Spectrum Access Under an Overall Power Constraint

Optimal power allocation policies in multi-hop cognitive radio networks

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