Optimal power allocation for relayed transmissions over rayleigh fading channels

Hasna, Mazen O.; Alouini, Mohamed‐Slim

doi:10.1109/vetecs.2003.1208833

Cited by 143 publications

(189 citation statements)

References 15 publications

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“…SU nodes G \ that do not take part in the routing session are kept in sleep mode to ensure savings of their battery power. In order to avoid interference between SU nodes during message transmission we assume nodes are using orthogonal channels following [33].…”

Section: System Model and Problem Formulation 21 Network Modelmentioning

confidence: 99%

Joint Power Allocation and Routing in Outage Constrained Cognitive Radio Ad Hoc Networks

Basak

Acharya

2015

Mobile Netw Appl

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We investigate the problems of route lifetime maximization and interference to primary user minimization jointly in outage constrained stationary cognitive radio ad hoc networks. It may be noted that although, both lifetime maximization schemes in wireless ad hoc networks (WANETs) and interference minimization schemes in cognitive radio networks mostly aim to minimize transmission power of nodes in a given routing session, using any one of them to achieve both of the said objectives simultaneously does not yield satisfactory performance. In this paper, first, we study both minimum total interference (MTI) and maximum lifetime (ML) routing problems separately as joint power allocation and routing problems. Next closed form expressions for power allocation for both MTI and ML strategies are derived and, from these solutions, we obtain corresponding routing metrics to solve the routing problems. Moreover, closed form expression for a hybrid-ML-MTI power allocation approach is also proposed followed by a new hybrid routing metric. We also present implementation issues related to the proposed hybrid routing and power allocation scheme. Extensive simulation results are used to evaluate performance of our proposed schemes both in regular grid and random networks. Results show that while in grid networks, a straightforward combination of MTI routing with ML power allocation scheme strikes a good balance between interference and lifetime performances, in random networks, our proposed hybrid approach is found to extend lifetime and control interference performances simultaneously in a significant manner.

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Section: System Model and Problem Formulation 21 Network Modelmentioning

confidence: 99%

Joint Power Allocation and Routing in Outage Constrained Cognitive Radio Ad Hoc Networks

Basak

Acharya

2015

Mobile Netw Appl

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“…Clearly, as P out;1 and P out;2 are outage probability functions, they are convex (when drawn in a linear scale) [12]. Therefore, the problem formulated in (12) is a convex problem, which means that it must have a unique optimal solution.…”

Section: Optimal Power Allocation Schemementioning

confidence: 99%

Power Allocation for Cognitive Two-Way AF Relay Networks with Asymmetric Traffic Requirements

Shi

2015

Wireless Pers Commun

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In this paper, we study the power allocation for two-way amplify-and-forward relay networks with asymmetric traffic requirements in cognitive radio. The proposed power allocation scheme is achieved by minimizing the weaker link's individual outage probability under the sum-power constraint and interference power threshold (IPT) constraints of the primary user (PU). Particularly, for the purpose of accomplishing the power allocation more realistically, the interference to each other between PU and secondary user (SU) and relay is taken into consideration. And the closed-form solution is derived for the optimum power allocation scheme of each case. Numerical results confirm that the proposed scheme improves the system performance compared with the equal power allocation scheme under various traffic requirements. The outage probability of SU communication is limited by the IPT constraints of PU and is affected significantly by the IPT level of PU. Furthermore, regardless of the symmetric or asymmetric traffic requirements, the proposed power allocation scheme is more suitable for cognitive two-way relaying networks.

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“…In refs. [3][4][5][6][7], the optimal allocation that minimizes the outage probability is developed for decode-and-forward (DF) relaying. Almost all these papers consider power allocation problems for the orthogonal cooperative protocols in which the source remains silent when the relays transmit.…”

Section: Introductionmentioning

confidence: 99%

Power allocation for non-orthogonal decode-and-forward cooperation protocol

Zhang

Cai

2009

Sci. China Ser. F-Inf. Sci.

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This paper studies the power allocation problem for the non-orthogonal decode-and-forward (NDF) cooperation protocol with selection relaying. With the availability of the magnitudes of all channel gains at the source, the power allocation is explored that maximizes the mutual information between the source and destination subject to a total power constraint. The minimum power that avoids the outage of the relay is set as a condition, under which the power allocation problem becomes one of selecting the optimal one from several allocation factor triplets. It is shown that the power allocation scheme can provide considerable performance gain, and the non-orthogonal cooperation protocol is superior to the orthogonal protocol and direct transmission.non-orthogonal, decode-and-forward, power allocation, relaying

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Optimal power allocation for relayed transmissions over rayleigh fading channels

Cited by 143 publications

References 15 publications

Joint Power Allocation and Routing in Outage Constrained Cognitive Radio Ad Hoc Networks

Joint Power Allocation and Routing in Outage Constrained Cognitive Radio Ad Hoc Networks

Power Allocation for Cognitive Two-Way AF Relay Networks with Asymmetric Traffic Requirements

Power allocation for non-orthogonal decode-and-forward cooperation protocol

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