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Multi-dimensional Parameter Estimation Algorithm in MIMO Cognitive Radio

Author: BaiXue
Tutor: SunXiaoYing
School: Jilin University
Course: Communication and Information System
Keywords: MIMO cognitive radio Multi-parameter estimation algorithm ALS algorithm MMEdetection algorithm
CLC: TN925
Type: Master's thesis
Year: 2012
Downloads: 109
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Abstract


MIMO (multiple input multiple output) cognitive radio system has highercapacity, it can handle complexity information. Through extracting the character ofprimary user, cognitive radio can not only occupy the idle spectrum, but also canchange the parameters such as code and angle to use the busy spectrum. It is anefficient method to make better use of spectrum.Based on theoretical background of spectrum sensing of cognitive radio, thisdissertation studies multi-dimensional parameter estimation algorithm in MIMOcognitive radio, which applies parallel factor and MME method to complete thespectrum detection and estimation value of the parameter of primary users andimproves the flexibility and efficiency of spectrum resources.For the problems of not fully use of spatial resources, we use the beamformingtheory to verify that this dimension can increase access opportunity. Music algorithmis used to estimate the direction of arrival of the primary user after confirming theexistence of primary user. Simulations are used to estimate the DOA of primary user.For the problems of not fully use of code resources, we suppose the primary useris DS/CDMA signal in white Gaussian noise environment, we apply the singular valuedecomposition theory to deal with covariance matrix, and reconstruct the original PNcode sequence by the largest singular value and the second largest singular valuesequence.Consider the actual noise background and multipath propagation environmentwith the symbol interference, we analyze the multi-users DS-CDMA signals with thehelp of the multi-linear mathematical tools and construct the third-order tensor tocollect the full information of the primary users. The parallel factor theory and thealternating least squares (ALS) algorithm are used to process the multi-dimensionalspectrum sensing model, at the same time, the primary users’ PN code and thedirection of arrival(DOA) are estimated. The application of ALS algorithm incognitive radio make the secondary user better grasp the primary users’ introductionand lay the theoretical foundation to forecast the status of the primary uses. The main work of this paper are as follows:(1)According to the spectrum detection, beamforming theory, we combined withthe MME detection algorithm、Music DOA estimation algorithm to extract theparameters of primary uses such as arrival of direction and PN code, at the same time,flexibility and efficiency of resource is improved.(2)Consider multipath propagation environment with the symbol interference,we analyze the multi-users DS-CDMA signals with multi-linear mathematical tools.Third order tensor is used to fully collect the information of primary users. Simulationis used to verify the convergence of the algorithm, and the estimation algorithm isused to improve the adaptability.The above works solute the problem of usage of non-empty spectrum andprovide a certain reference value for the research and development of algorithm ofspectrum and resources allocation.

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CLC: > Industrial Technology > Radio electronics, telecommunications technology > Wireless communications > Radio relay communications,microwave communications
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