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Spectrum allocation algorithm for cognitive radio multi-cell research

Author: WuFei
Tutor: LiShaoQian
School: University of Electronic Science and Technology
Course: Communication and Information System
Keywords: Cognitive radio Spectrum allocation Graph Theory coloring Interference temperature model
CLC: TN92
Type: Master's thesis
Year: 2008
Downloads: 463
Quote: 4
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Abstract


The proposed cognitive radio technology can fundamentally solve the problem of insufficient spectrum. By detecting the authorized users of the spectrum usage, adaptively adjusting the communication parameters, the cognitive users choose optional machine idle spectrum communication is possible to improve the spectrum utilization. Cognitive radio spectrum allocation to face enormous challenges, how to efficiently use dynamic changing spectrum resources, to provide reliable communication services for the cognitive users need to have very different ways of working and the available spectrum with traditional wireless communication system, research to solve important problems. Cognitive radio technology to both spectrum are authorized system idle spectrum and unlicensed spectrum, cognitive systems are very different behavior in different spectrum will. Choose the use of the the authorization system idle spectrum need to protect the authorized user's communication difficulties and focus of the existing research. This paper first introduces cognitive radio defined the three, at home and abroad cognitive radio system and cognitive radio related standard formulation. Around the multi-cell for cognitive radio spectrum allocation issue, this paper introduces a cognitive radio spectrum sharing model, cognitive radio system model, the common model of spectrum allocation and cognitive radio is introduced, the above model is more inter-cell spectrum allocation research and reference. Subsequently, in-depth study of the cognitive system to choose the spectrum allocation problem in the use of the multi-cell the authorization system idle spectrum mode. By introducing colored model spectrum allocation algorithm based on graph theory, analysis algorithms based on this paper, the concept of spectrum quality grading interference temperature model, to better represent the spectrum of differences and based on the needs of the multi- The cell spectrum allocation algorithm, the shading model is used to graph theory the spectrum allocation of the multi-cell, able to guarantee the QoS based on the business needs of the each cell is assigned spectrum, to improve efficiency to meet the demand of each cell service and spectrum allocation. By the lack of colored graph theory model, based on the interference temperature model to further study the joint power control in multi-cell cognitive radio spectrum allocation algorithm. In-depth study of existing algorithms - a two-stage resource allocation algorithm based on interference temperature model of the multi-cell spectrum allocation and power control algorithm based on the combined channel allocation based on dynamic interference graph, advanced two-stage resource allocation algorithm, and make full use of the allocation to the cell's power to improve cognitive system utility. Lack of spectrum allocation fairness lower advanced spectrum allocation policy and fairness algorithm has been improved in order to improve the fairness of the distribution of the spectrum.

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