Multiple Generalized Sidelobe Cancellers for Minimization of Interference in Cognitive Radio System

The challenge associated with cognitive radio systems based on orthogonal frequency division multiplexing (OFDM) lies in sidelobes caused by the OFDM subcarriers. As a result, reducing these sidelobes originating from the transmitter becomes crucial. Several methods are suggested in the literature to suppress these sidelobes, but the prerequisites for better superior techniques are still demanding. The earlier methods comprise the use of cancellation carriers to overcome these sidelobes. However, the cancellation carrier scheme leads to incompetent spectrum utilization because of the insertion of extra subcarriers to minimize interference. This paper proposes the employment of multiple generalized sidelobe cancellers (GSCs) in serial concatenation. The outputs of one GSC are fed into the following GSCs to produce enhanced sidelobe suppression. The effectiveness of the suggested approach is evaluated through simulations in comparison with various established techniques. Simulation results demonstrate improved sidelobe reduction performance for the proposed scheme compared with existing methods.