Resource allocation problems: algorithmic approaches
Resource allocation problems: algorithmic approaches
Convex Optimization
Encyclopedia of Optimization
Spectrum Challenges and Solutions by Cognitive Radio: An Overview
Wireless Personal Communications: An International Journal
Opportunistic spectrum access for energy-constrained cognitive radios
IEEE Transactions on Wireless Communications
An optimal sensing framework based on spatial RSS-profile in cognitive radio networks
SECON'09 Proceedings of the 6th Annual IEEE communications society conference on Sensor, Mesh and Ad Hoc Communications and Networks
How much time is needed for wideband spectrum sensing?
IEEE Transactions on Wireless Communications
Optimal allocation of sensing time between two primary channels in cognitive radio networks
IEEE Communications Letters
Sensing-Throughput Tradeoff for Cognitive Radio Networks
IEEE Transactions on Wireless Communications
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In this paper, we consider a wideband cognitive radio network (CRN) containing a single secondary user (SU) which can only serially sense multiple narrowband channels and thus maximize the utilization of perceived available channels. Before transmitting, during a period of time 驴, SU allocates 驴 i to each channel and senses whether the channel is available or not. When transmitting, SU allocates different transmit power P i to each channel. We study the problem of designing the optimal spectrum sensing time allocation 驴 i , total sensing time 驴 and power allocation P i between the multiple channels so as to maximize the achievable rate of CRN subject to the constraint of the total transmit power and probability of detection. The problem is transformed into some subproblems with low complexity and solved by optimal means separately. From the time and power allocation parameters, we conclude that channels with low probability of transmission chance or low channel gain will be closed without sensing or transmission in order to get the maximum rate. We also analyze how the conclusions can be applied to the scenario of multiple SUs. Numerical investigation shows that the proposed scheme can significantly achieve spectrum access and the optimization process improves the rate obtained by CRN.