Inlämning av Examensarbete / Submission of Thesis

Sheikh Fakhar Uddin; Ismail Khan Khattak , pp. 49. COM/School of Computing, 2012.

The work

Författare / Author: Sheikh Fakhar Uddin, Ismail Khan Khattak
shud10@student.bth.se, ismaelkhattak@hotmail.com
Titel / Title: Spectrum Selection Technique to Satisfy the QoS Requirements in Cognitive Radio Network
Abstrakt Abstract:

The demand of wireless spectrum is increasing very fast as the field of telecommunication is advancing rapidly. The spectrum was underutilized because of fixed spectrum assignment policy and this valuable spectrum can be utilized efficiently by cognitive radio technology. In this thesis we have studied spectrum selection problems in cognitive radio network. Channel sharing and channel contention problems arise when multiple secondary users tend to select same channel. The thesis work is focused on spectrum selection issue with the aim to minimize the overall system time and to solve the problem of channel contention and channel sharing. The overall system time of secondary connection is an important performance measure to provide quality of service for secondary users in cognitive radio network.

We studied two spectrum selection schemes that considerably reduce the overall system time and resolve the problems of channel sharing and channel contention. An analytical model associated with Preemptive Resume Priority (PRP) M/G/1 queuing model has been provided to evaluate the studied spectrum selection scheme. This model also analyzes the effect of multiple handoffs due to arrival of primary users. According to this scheme, the traffic load is distributed among multiple channels to balance the traffic load. Secondary users select the operating channels based on the spectrum selection algorithm. They can intelligently adopt better channel selection scheme by considering traffic statistics and overall transmission time. All simulation scenarios are developed in MATLAB.

Based on our result we can conclude that both channel selection schemes considerably reduce the overall transmission time of secondary users in cognitive radio network. The overall transmission time increase with the rise of arrival rate of secondary user. The probability based channel selection scheme perform better with lower arrival rate and sensing based channel selection scheme perform better with higher arrival rate of secondary users. These channel selection schemes help distribute the traffic load of secondary users evenly among multiple channels. Hence, increase the channel utilization and resolve the channel contention problem.

Ämnesord / Subject: Telekommunikation - Telecommunications
Mathematics\Analysis
Datavetenskap - Computer Science\Networks and Communications
Nyckelord / Keywords: Cognitive Radio Network, QoS, Spectrum Selection

Publication info

Dokument id / Document id: houn-928rkl
Program:/ Programme Electrical Engineering with emphasis on Telecommunication
Registreringsdatum / Date of registration: 11/20/2012
Uppsatstyp / Type of thesis: Masterarbete/Master's Thesis (120 credits)

Context

Handledare / Supervisor: Professor Adrian Popescu
adrian.popescu@bth.se
Examinator / Examiner: Dr. Patrik Arlos
Organisation / Organisation: Blekinge Institute of Technology
Institution / School: COM/School of Computing

+46 455 38 50 00

Files & Access

Bifogad uppsats fil(er) / Files attached: bth2012fakharuddin.pdf (1007 kB, öppnas i nytt fönster)