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Cognitive radio (CR) is a promising technique for future wireless communication systems. In CR networks, dynamic spectrum access (DSA) of frequency is implemented to mitigate spectrum scarcity. Specifically, a secondary (unlicensed) user may be allowed to access the temporarily unused frequency bands granted to a primary (licensed) user. DSA has to be implemented so that the quality of service (QoS) promised to the primary user must be satisfied. The key point for this is the secondary user’s ability to detect the presence of the primary user correctly. Therefore a quick and reliable spectrum occupancy decision based on spectrum sensing becomes a critical issue irrespective of the architecture of the CR networks.

Exact and Asymptotic Analysis of Largest Eigenvalue Based Spectrum Sensing