Date Added: Jul 2012
Cognitive Radio (CR) is a technique which is used to improve the utilization of the radio spectrum. It is a software controlled radio that senses the unused frequency spectrum at any time. The main problem in cognitive radio is spectrum sensing. In this paper, the comparison of different techniques for spectrum sensing and transceiver from different perspectives is presented and a new architecture is suggested, which can give a better hardware resources utilization and also spectrum sensing time can be reduced.