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Wireless Personal Communications
Erschienen in: Wireless Personal Communications 3/2020

28.05.2020

Energy-Efficiency-Based Power Allocation Scheme in Multi-user Single-DF-Relay Cognitive Networks

verfasst von: Xianru Liu, Wenhao Du

Erschienen in: Wireless Personal Communications | Ausgabe 3/2020

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Abstract

Due to the enhancement in both spectral efficiency and energy efficiency, cognitive radio (CR) being combined with relay cooperation technique is deemed as a promising way to realize green-broadband communication in the fifth generation (5G) networks. In this paper, for such CR-relay networks operating in underlay mode, when multiple secondary cognitive users (SUs) share a common cognitive relay in decode-and-forward manner to complete their physical transmissions, system power consumption is investigated. For the scenarios where the co-channel interference to primary users and the peak transmit power of SUs and cognitive relay are constrained, the problem of power allocation in CR-relay network is formulated to minimizing sum-system-consumption. Then, based on the principle that power-consumption minimization is equivalent to energy-efficiency maximization, a novel power allocation scheme is proposed. Further numerical simulation is used to verify the optimality of the proposed power allocation scheme.
Vorheriger Artikel An Efficient Compressive Sensing Routing Scheme for Internet of Things Based Wireless Sensor Networks
Nächster Artikel Correction to: Energy-Efficiency-Based Power Allocation Scheme in Multi-user Single-DF-Relay Cognitive Networks

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Fußnoten
1
Under underlay cognitive mode, as secondary sources usually can not transmit their signals with their own maximal transmit power, their maximal transmit power are just considered by the allowable transmit power when co-channel interference to primary users are considered.
 
2
Similar to [25] and [26], it is assumed that the relay R can decode its received signal reliably when the SNR of its received signal equal to or greater than the target SNR at the destination.
 
3
To simulate the scenario of cognitive relay networks, it is assumed that \(P_{i,max}^S = I_{th}/|h_{S_i,U}|^2\), \(P_{i,max}^R=I_{th}/|h_{R,U}|^2\), \(h_{R,U}\) and \(h_{S_i,U}\) are produced randomly in range (0.5, 1).
 
4
To the best of our knowledge, there is no other power allocation schemes for our considered model. Hence, in the simulation, when the equal power allocation is not feasible, our scheme is used to allocate power for secondary pairs. Consequently, the sum-system-power consumption is equal to that of equal power allocation scheme when the allowable interference is small.
 
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Metadaten
Titel
Energy-Efficiency-Based Power Allocation Scheme in Multi-user Single-DF-Relay Cognitive Networks
verfasst von
Xianru Liu
Wenhao Du
Publikationsdatum
28.05.2020
Verlag
Springer US
Erschienen in
Wireless Personal Communications / Ausgabe 3/2020
Print ISSN: 0929-6212
Elektronische ISSN: 1572-834X
DOI
https://doi.org/10.1007/s11277-020-07455-3

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