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In this letter, we study the performance of cognitive Underlay Systems (USs)that employ power control mechanism at the Secondary Transmitter (ST). Existingbaseline models considered for the performance analysis either assume theknowledge of involved channels at the ST or retrieve this information by meansof a feedback channel, however, such situations hardly exist in practice.Motivated by this fact, we propose a novel approach that incorporates theestimation of the involved channels at the ST, in order to characterize theperformance of USs under realistic scenarios. Moreover, we apply an outageconstraint that captures the impact of imperfect channel knowledge,particularly on the interference power received at the primary receiver.Besides this, we employ a transmit power constraint at the ST to determine anoperating regime for the US. Finally, we analyze an interesting tradeoffbetween the estimation time and the secondary throughput allowing an optimizedperformance of the US.

Performance Analysis of Underlay Cognitive Radio Systems: Estimation-Throughput Tradeoff