Study and Analysis of Spectrum Sensing Techniques and Implementation of Matched Filters in Cognitive Radio Systems

Spectrum sensing is an essential enabling functionality for cognitive radio networks to detect spectrum holes and opportunistically use the under-utilized frequency bands without causing harmful interference to legacy networks. This paper introduces a novel wideband spectrum sensing technique, called multiband joint detection, which jointly detects the signal energy levels over multiple frequency bands rather than consider one band at a time. . This radio link may offer simple line-of-sight or multipath propagation of communication signal depending on channel condition and channel type. The proposed strategy is efficient in improving the dynamic spectrum utilization and reducing interference to the primary users and also enlightens the implementation and analysis through simulation of Matched filtering. The spectrum sensing problem is formulated as a class of optimization problems in interference limited cognitive radio networks. By exploiting the hidden convexity in the seemingly non-convex problem formulations, optimal solutions for multiband joint detection are obtained under practical conditions. Simulation results show that the proposed spectrum sensing schemes can considerably improve the system performance. This paper establishes important principles for the design of wideband spectrum sensing algorithms in cognitive radio networks.