Throughput optimization for Cognitive Radio while bulwarking Primary User

Abstract

Electromagnetic spectrum, a natural limited resource, with the boom in applications of wireless communications, that limited resource is becoming congested more and more and the only solution for efficient spectrum utilization is Cognitive Radios, moreover spectrum sensing is the most irrefutably functionality in CRs and with spectrum sensing, throughput for secondary user's transmission plays an important role. In this paper after performing spectrum sensing using energy detection scheme, we have achieved the optimized throughput for Secondary User by ensuring the protection of Primary User's rights. For a total time in a frame, least time for sensing is desired and the residual time in that frame is used for transmission. Two parameters related to sensing are fallacious alarm probability and detection probability pertaining to secondary and primary users correspondingly, greater the probability of detection, more the licensed user's rights are protected, smaller the fallacious alarm probability, greater chance of using the underutilized band, applying the most famous technique known as energy detection scheme. In this paper we studied the problem of conniving sensing time in order to achieve maximum and optimal transmission time for secondary user keeping the restraint that licensed user is adequately bulwarked. Maximum achievable throughput was achieved with least sensing time, not achieved in previous work.