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Practical Spectrum Aggregation for Secondary Networks with Imperfect Sensing

Lee, Haeyoung, Ko, Y, Vahid, Seiamak and Moessner, Klaus (2015) Practical Spectrum Aggregation for Secondary Networks with Imperfect Sensing IEEE Transactions on Vehicular Technology, 65 (7). pp. 5474-5484.

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We investigate a collision-sensitive secondary network that intends to opportunistically aggregate and utilize spectrum of a primary network to achieve higher data rates. In opportunistic spectrum access with imperfect sensing of idle primary spectrum, secondary transmission can collide with primary transmission. When the secondary network aggregates more channels in the presence of the imperfect sensing, collisions could occur more often, limiting the performance obtained by spectrum aggregation. In this context, we aim to address a fundamental query, that is, how much spectrum aggregation is worthy with imperfect sensing. For collision occurrence, we focus on two different types of collision: one is imposed by asynchronous transmission; and the other by imperfect spectrum sensing. The collision probability expression has been derived in closed-form with various secondary network parameters: primary traffic load, secondary user transmission parameters, spectrum sensing errors, and the number of aggregated sub-channels. In addition, the impact of spectrum aggregation on data rate is analysed under the constraint of collision probability. Then, we solve an optimal spectrum aggregation problem and propose the dynamic spectrum aggregation approach to increase the data rate subject to practical collision constraints. Our simulation results show clearly that the proposed approach outperforms the benchmark that passively aggregates sub-channels with lack of collision awareness.

Item Type: Article
Divisions : Faculty of Engineering and Physical Sciences > Electronic Engineering
Authors :
Ko, Y
Date : 6 August 2015
DOI : 10.1109/TVT.2015.2465388
Copyright Disclaimer : © 2015 IEEE. Personal use is permitted, but republication/redistribution requires IEEE permission. See for more information.
Depositing User : Symplectic Elements
Date Deposited : 02 Mar 2016 11:24
Last Modified : 16 Jan 2019 17:01

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