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In this paper, we investigate the robust power allocation issue in orthogonal frequency division multiplexing-based cognitive radio networks (CRNs) with unavoidable uncertainties (channel perturbations and variable environment). In this case, to control the performance degradation due to the uncertainties, we maximize the data rate of secondary users (SUs) by considering maximum allowable interference...
This paper investigates power allocation problems for orthogonal frequency division multiplexing (OFDM)-based cognitive radio networks operating in licensed frequency bands. Considering imperfect spectrum sensing, a new power allocation algorithm is proposed to minimize the total interference introduced to primary user under a minimum capacity constraint of secondary user (SU) and a total transmit...
An energy efficiency (EE) maximization scheme in a spectrum overlay scenario with multiple primary users (PUs) and one cognitive radio (CR) user (secondary user, SU) co-existing side by side bands is considered, where instead of using conventional interference power constraint (IPC) to ensure normal transmission of PUs, a timeout probability constraint (TPC) transformed from the delay effect of PUs...
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