ENERGY DETECTION BASED SPECTRUM SENSING FOR COGNITIVE RADIO

Cognitive Radio is an emerging technology which avoids the congestion in wireless communication by exploiting unused radio spectrum . The Spectrum sensing plays a fundamental requirement of CR which finds an unused free spectrum and detects the licensed user transmissions.energy detection constitutes a preferred approach for cognitive rdio spectrum sensing due to its simple applicability. In this paper Wiener khinchin theorem ,QAM techniques are used for the energy detection

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