Interference Management in Spectrum Sharing Systems
type: CreativeWork
description: Most of the radio spectrum is allocated to licensed services for their exclusive use. This has led to a shortage of spectrum for deploying new wireless services. However, measurements show that a large amount of radio spectrum allocated to licensed services is temporally and spatially underutilised. Spectrum sharing between licensed (primary) and unlicensed systems has been proposed for enhancing the spectral utilisation. This thesis investigates spectrum sharing on the highly underutilised television broadcast frequency bands. The Federal Communications Commission (FCC) has analysed spectrum sharing between a broadcast primary system and a single unlicensed device (unlicensed transmitter). This thesis extends the FCC analysis by considering multiple unlicensed devices operating in an ad hoc network. It is important that the interference from the unlicensed system to the primary system is limited to an acceptable level. In this thesis, such interference is limited by imposing geographical constraints on the unlicensed system by defining protection regions (i.e. unlicensed device exclusive regions) around the primary transmitter coverage areas. Analytical tools for determining the required protection distances (that define the size of the protection regions) are presented. It is identified that accurate modelling of the radio channel is extremely important in order to efficiently define protection regions and hence ensure primary system protection. The protection distances are also significantly sensitive to the primary system protection criterion and the density of unlicensed devices, especially when multiple primary transmitters with comparatively (compared to their coverage radius) small separation distances are considered. In this thesis, the capacity of the unlicensed system operating under geographical constraints imposed by the primary system performance requirements is characterised. The maximum density of unlicensed devices allowed to simultaneously contend …
abstract: Most of the radio spectrum is allocated to licensed services for their exclusive use. This has led to a shortage of spectrum for deploying new wireless services. However, measurements show that a large amount of radio spectrum allocated to licensed services is temporally and spatially underutilised. Spectrum sharing between licensed (primary) and unlicensed systems has been proposed for enhancing the spectral utilisation. This thesis investigates spectrum sharing on the highly underutilised television broadcast frequency bands. The Federal Communications Commission (FCC) has analysed spectrum sharing between a broadcast primary system and a single unlicensed device (unlicensed transmitter). This thesis extends the FCC analysis by considering multiple unlicensed devices operating in an ad hoc network. It is important that the interference from the unlicensed system to the primary system is limited to an acceptable level. In this thesis, such interference is limited by imposing geographical constraints on the unlicensed system by defining protection regions (i.e. unlicensed device exclusive regions) around the primary transmitter coverage areas. Analytical tools for determining the required protection distances (that define the size of the protection regions) are presented. It is identified that accurate modelling of the radio channel is extremely important in order to efficiently define protection regions and hence ensure primary system protection. The protection distances are also significantly sensitive to the primary system protection criterion and the density of unlicensed devices, especially when multiple primary transmitters with comparatively (compared to their coverage radius) small separation distances are considered. In this thesis, the capacity of the unlicensed system operating under geographical constraints imposed by the primary system performance requirements is characterised. The maximum density of unlicensed devices allowed to simultaneously contend …
author: Dahama, Rachita
license: https://researchspace.auckland.ac.nz/docs/uoa-docs/rights.htm
date published: 2012
date modified: 2026-07-24T01:03:18Z
provider: University of Auckland
publisher: Networked Digital Library of Theses and Dissertations
type: WebPage
source organization: ResearchSpace@Auckland

PropertyValue
property ID: Handle
value: https://hdl.handle.net/2292/19655