Sesay, AbuLe, Ngon2017-07-172017-07-1720172017Le, N. (2017). Spectrum Sensing for Wavelet Packet Modulation Schemes in Wireless Communication Systems (Doctoral thesis, University of Calgary, Calgary, Canada). Retrieved from https://prism.ucalgary.ca. doi:10.11575/PRISM/27853http://hdl.handle.net/11023/3959Orthogonal Frequency Division Multiplexing (OFDM) is the popular multicarrier modulation technique used in wireless communications, especially on fading channel. Having some advantages compared to OFDM, Wavelet Packet Modulation (WPM) is a promising multicarrier candidate in Cognitive Radio (CR) systems. An essential component of the CR systems is efficient and fast spectrum sensing (SS), which ensures that the secondary users (SUs) use the spectral resources at the right time and place. In this dissertation, based on an approximated Covariance Matrix of the noise-free received signal, several novel spectrum sensing methods are proposed for WPM systems. Dealing with the shortage of knowledge about the primary signal at the SUs’ receiver, another SS method based on Rao score’s test is also proposed. To reduce the sensing time, two sequential SS approaches are proposed and investigated. The excellent performances of the proposed methods are evaluated under various constraints, shown by some analytic and simulation results.engUniversity of Calgary graduate students retain copyright ownership and moral rights for their thesis. You may use this material in any way that is permitted by the Copyright Act or through licensing that has been assigned to the document. For uses that are not allowable under copyright legislation or licensing, you are required to seek permission.Engineering--Electronics and ElectricalSpectrum sensingCognitive Radiodoctoral thesishttp://dx.doi.org/10.11575/PRISM/27853