The effectiveness of cognitive radio systems depends mainly on the techniques used for spectrum sensing. The main aim of cognitive radio is effective spectrum utilization by sharing the spectrum with secondary users when a primary user is absent. This project uses the periodogram and multi-taper methods, which are optimized to enhance the receiver operating characteristics. The cooperative sensing techniques have been combined using weights based on the distance to the primary user in order to achieve improved performance. The probability of detection and probability of false alarm have been derived using the optimized methods. By incorporating multi-antenna techniques for better reception and with prior knowledge of the primary user signal, it is shown that spectrum performance has been improved.
|Commitee:||Ary, James, Khoo, I-Hung|
|School:||California State University, Long Beach|
|School Location:||United States -- California|
|Source:||MAI 55/04M(E), Masters Abstracts International|
|Keywords:||Cooperative, Networks, Spectrum, Wireless|
Copyright in each Dissertation and Thesis is retained by the author. All Rights Reserved
The supplemental file or files you are about to download were provided to ProQuest by the author as part of a
dissertation or thesis. The supplemental files are provided "AS IS" without warranty. ProQuest is not responsible for the
content, format or impact on the supplemental file(s) on our system. in some cases, the file type may be unknown or
may be a .exe file. We recommend caution as you open such files.
Copyright of the original materials contained in the supplemental file is retained by the author and your access to the
supplemental files is subject to the ProQuest Terms and Conditions of use.
Depending on the size of the file(s) you are downloading, the system may take some time to download them. Please be