Implementing Complex Radio System in Short Time Using Cognitive Radio

Usually, the frequency use of wireless system is characterized by static spectrum allocation. In order to cope with high data rate and high quality service, new wireless communication cognitive radio is emerged. The major issue in communication is declared by FCC is that the licensed band remains unused. These problems are addressed by the Mitola (Software radio, wireless architecture for twenty-first century [1]), and as a result, the cognitive radio technology has been proposed to improve the efficiency in spectrum utilization, by exploiting frequencies that are not been used by licensed users at a given time and location. Modulation determines the performance of communication system. The primary purpose of this paper is to experiment various modulation techniques of the wireless channel using software-defined radio. The paper emphasizes the cognitive radio and its significance compared with conventional wireless communication and also provides a comprehensive literature review of modulation techniques and its implementation using the universal software radio peripheral (USRP) device which acts as a transmitter, a receiver, and a relay.