The Cognitive Radio System On Software Defined Radio Platform

With the rapid development of wireless communication technology, the third generation mobile communication system, the LTE and LTE-A system become more and more popular. The wireless spectrum resources become increasingly scarce. The original spectrum allocation strategy based on static spectrum caused enormous waste, the use of spectrum resources in time and space dimension is very uneven, so the demand for efficient spectrum sensing method has become increasingly urgent. With the continuous development of communication technology, communication equipments are required to support more communication systems and universal softwares. So in recent years, software radio technology attracts a growing number of attention and becomes the development trend of communication technology.This thesis presented an efficient wideband signal spectrum sensing algorithm which is based on an unknown a priori information broadband spectrum sensing scenario, and the algorithm is simulated. In engineering considerations, in order to demonstrate and verify the situation that cognitive radio system work, and in order to prove the validity of the key algorithm mentioned, and a system based on software radio spectrum cognitive platform is proposed, the development and testing work are completed. Spectrum sensing methods in software radio platform is researched in-depth and a method of cognitive system working on the software radio platform is presented.