Inlämning av Examensarbete / Submission of Thesis

Rizwan Hussain MEE09:34, pp. 61. ING/School of Engineering, 2009.

The work

Författare / Author: Rizwan Hussain
Titel / Title: Adaptive Power Control by Using the Received SNR as a Proxy for Distance to Optimize the Spectrum Usage in a Cognitive Radio System
Abstrakt Abstract:

In this thesis work we have proposed an Adaptive Power Transmission scheme for Cognitive Radio. The proposed scheme estimates the distance between the primary user and the Cognitive Radio, using the SNR as proxy for distance, also utilizing the information of IT (Interference Temperature). On the basis of these information the Cognitive radio adaptively changes its transmit power to prevent the primary user from harmful interference. The most challenging problem of cognitive radio is the interference which occurs when a cognitive radio accesses a licensed band but fails to notice the presence of the licensed user. Another challenge is to compute the correct distance between the cognitive radio and the primary user. To allow the cognitive radio to access the same spectrum band where the primary user is operating creates a problem, in such case; the cognitive radio may interfere with the primary system, hence degrading the quality of service for the primary receiver. The Primary goal of this work is to propose Adaptive power control based on the estimated distance between the cognitive radio and primary user. We will discuss the transmit power being controlled on the basis of distance. But there is no such method to calculate the exact distance between the cognitive radio and the primary user, so that we interpret distance in terms of SNR. We will propose a method to make the CR so intelligent that it can determine the maximum level of the transmission power which does not cause any harmful interference to the primer user’s quality of service.

Ämnesord / Subject: Telekommunikation - Telecommunications
Signalbehandling - Signal Processing
Elektroteknik - Electrotechnology
Nyckelord / Keywords: Awareness, Channel-State Estimation and Predictive modelling, Cognition, Emergent Behaviour, Interference Temperature, Radio-Scene Analysis, Spectrum Analysis, Spectrum Holes, Spectrum Management, Transmit-Power Control, Adaptive Modulation, MIMO

Publication info

Dokument id / Document id:
Program:/ Programme Elektroteknik
Registreringsdatum / Date of registration: 06/25/2009
Uppsatstyp / Type of thesis: Masterarbete/Master's Thesis (120 credits)


Handledare / Supervisor: Maria Erman
Examinator / Examiner: Dr. Jörgen Nordberg
Organisation / Organisation: Blekinge Institute of Technology
Institution / School: ING/School of Engineering

+46 455 38 50 00

Files & Access

Bifogad uppsats fil(er) / Files attached: thesis_report.pdf (1029 kB, öppnas i nytt fönster)