3. Electronic Theses and Dissertations (ETDs) - All submissions

Permanent URI for this communityhttps://wiredspace.wits.ac.za/handle/10539/45

Browse

Subject: search.filters.subject.Cognitive radio networks

Search Results

Now showing 1 - 4 of 4
  • No Thumbnail Available
    Item
    Cooperative Spectrum Sensing in Multi-channel RF Energy Harvesting Cognitive Radio Networks
    (2019) Olawole, Akinbode Alex
    The need to improve the utilization e ciency of the limited radio resources in the face of the increasing number of radio network services, coupled with the growing interest in making wireless and mobile technologies energy smart has prompted research interest in energy harvesting based cognitive radio networks (EH-CRNs). EH-CRNs promises to jointly facilitate dynamic spectrum access (DSA) and a cheaper and more convenient energy alternative source to the replaceable batteries in wireless radio networks. However, investigations have shown that the performance of the technology is limited in terms of achievable throughput due to energy shortage occasioned by the random energy arrival at the SU terminal. The main focus of this thesis is therefore to develop a cooperative spectrum sensing scheme, which maximizes the achievable throughput of energy harvesting based secondary users, while ensuring adequate protection of the primary user (PU) against interference. The objectives are four-fold. Firstly, to appropriately allocate the secondary users (SU) to the PU channels in a many-to-many combinatorial assignment, taking into consideration the e ect of PU indepen-dence and the time-varying channel conditions. Secondly, to develop a robust and generalized cluster head selection scheme that follows the network dynamics for e cient cooperative spec-trum sensing. Thirdly, to develop a decision fusion rule that minimizes the total error rate in cooperative spectrum sensing; and nally, to determine the cooperative sensing parameters that maximize the capacity of the SU, subject to the harvested energy and PU protection in the multichannel EH-CRNs. Performance analysis and evaluation of the developed scheme is presented as simulations results and analytical models. The presented results demonstrate improved channel allocation, coop- erative spectrum sensing performance, energy arrival rate and the SUs energy e ciency, when the characteristics of the PU channels, and the SU networks are taken into consideration.
  • No Thumbnail Available
    Item
    The state of spectrum management reforms and the mobile broadband industry in the SADC region
    (2017-10-24) Thukani, Thabiso Kenneth
    Spectrum management reforms involve a departure from state-commanded administrative methods to market-driven property rights and or technology-enabled spectrum commons. This study explores spectrum management reforms that have been undertaken in the last decade, between 2006 and 2016, in the Southern African Development Community (SADC) region, with specific focus on the mobile broadband (MBB) industry. As a result, only spectrum bands allocated to terrestrial mobile and identified for International Mobile Telecommunications (IMT) by the International Telecommunication Union (ITU) in ITU Region 1 (Europe, Middle East and Africa) were considered. The purpose was to firstly analyse the progress thus far in reforming spectrum management practice in the region and secondly to critically analyse the effects of these reforms on the MBB industry in SADC within the framework of high demand for more spectrum as the cornerstone for rapid diffusion of MBB. Using a constructivist case study methodology, qualitative research was conducted in three SADC countries, namely, Botswana, Zambia and South Africa, representing small, medium and large markets respectively. The study draws on published documents such as policies, legislation, regulations and directly from individuals tasked with spectrum management in public and private sector organisations in these countries. The findings reveal that several market-driven reforms such as technology and service neutrality, spectrum re-farming and administrative incentive pricing (AIP), together with technology-enabled reforms such as commons or license-exempt spectrum for MBB technologies are all becoming widespread in the region. However, secondary trading and auctions have been stillborn concepts, partly due to market concentration concerns and appropriateness issues. The artificial scarcity of MBB spectrum supply in SADC is laid bare against a backdrop of general scarcity for demand and a discord over how this spectrum should be assigned and to whom. Vast amounts of allocated mobile spectrum in SADC lie fallow or are encumbered by other services such as broadcasting or at times are historically assigned to Fixed Wireless Access (FWA) applications. Analysis of the data from these three country case study provides insights that may be relevant to many other countries in the region. In conclusion, the study advances that the implementation of spectrum management reforms should be nuanced as these can impact, positively or negatively, on the distributive agenda of government. This research further advances knowledge by positing a novel conceptual framework for spectrum management reform based on the finding that the latter is not a binary exercise of a departure from administrative approach to either a market-driven or a technology-enabled one. However, spectrum management reform can be a continuum on which different elements of administrative, market-driven and technology-enabled approaches can be applied to varying degrees, depending on the respective country’s context.
  • No Thumbnail Available
    Item
    Channel assembling and resource allocation in multichannel spectrum sharing wireless networks
    (2017) Chabalala, Chabalala Stephen
    The continuous evolution of wireless communications technologies has increasingly imposed a burden on the use of radio spectrum. Due to the proliferation of new wireless networks applications and services, the radio spectrum is getting saturated and becoming a limited resource. To a large extent, spectrum scarcity may be a result of deficient spectrum allocation and management policies, rather than of the physical shortage of radio frequencies. The conventional static spectrum allocation has been found to be ineffective, leading to overcrowding and inefficient use. Cognitive radio (CR) has therefore emerged as an enabling technology that facilitates dynamic spectrum access (DSA), with a great potential to address the issue of spectrum scarcity and inefficient use. However, provisioning of reliable and robust communication with seamless operation in cognitive radio networks (CRNs) is a challenging task. The underlying challenges include development of non-intrusive dynamic resource allocation (DRA) and optimization techniques. The main focus of this thesis is development of adaptive channel assembling (ChA) and DRA schemes, with the aim to maximize performance of secondary user (SU) nodes in CRNs, without degrading performance of primary user (PU) nodes in a primary network (PN). The key objectives are therefore four-fold. Firstly, to optimize ChA and DRA schemes in overlay CRNs. Secondly, to develop analytical models for quantifying performance of ChA schemes over fading channels in overlay CRNs. Thirdly, to extend the overlay ChA schemes into hybrid overlay and underlay architectures, subject to power control and interference mitigation; and finally, to extend the adaptive ChA and DRA schemes for multiuser multichannel access CRNs. Performance analysis and evaluation of the developed ChA and DRA is presented, mainly through extensive simulations and analytical models. Further, the cross validation has been performed between simulations and analytical results to confirm the accuracy and preciseness of the novel analytical models developed in this thesis. In general, the presented results demonstrate improved performance of SU nodes in terms of capacity, collision probability, outage probability and forced termination probability when employing the adaptive ChA and DRA in CRNs.
  • No Thumbnail Available
    Item
    A comparative investigation on performance and which is the preferred methodology for spectrum management; geo-location spectrum database or spetrum sensing
    (2016) Ezebuka, Chijioke Ifakandu
    Due to the enormous demand for multimedia services which relies hugely on the availability of spectrum, service providers and technologist are devising a means or method which is able to fully satisfy these growing demands. The availability of spectrum to meet these demands has been a lingering issue for the past couple of years. Many would have it tagged as spectrum scarcity but really the main problem is not how scarce the spectrum is but how efficiently allocated to use is the spectrum. Once such inefficiency is tackled effectively, then we are a step closer in meeting the enormous demands for uninterrupted services. However, to do so, there are techniques or methodologies being developed to aid in the efficient management of spectrum. In this research project, two methodologies were considered and the efficiency of these methodologies in the areas of spectrum management. The Geo-location Spectrum Database (GLSD) which is the most adopted technique and the Cognitive radio spectrum sensing technique are currently the available techniques in place. The TV whitespaces (TVWS) was explored using both techniques and certain comparison based on performances; implementation, practicability, cost and flexibility were used as an evaluation parameter in arriving at a conclusion. After accessing both methodologies, conclusions were deduced on the preferred methodology and how its use would efficiently solve the issues encountered in spectrum management
Copyright Ownership Is Guided By The University's

Intellectual Property policy

Students submitting a Thesis or Dissertation must be aware of current copyright issues. Both for the protection of your original work as well as the protection of another's copyrighted work, you should follow all current copyright law.