  Spectrum sensing is the challenge for cognitive radio design and
implementation, which allows the secondary user to access the primary bands
without interference with primary users. Cognitive radios should decide on the
best spectrum band to meet the Quality of service requirements over all
available spectrum bands. This paper investigates the integrated centralized
spectrum sensing techniques in multipath fading environment and the performance
was analyzed with energy detection and wavelet based sensing techniques for
unknown signal. Keywords: Cognitive Radio, Spectrum Sensing, Signal Detection,
Primary User, Secondary User
