Convex Optimization
Fundamentals of wireless communication
Fundamentals of wireless communication
Bit and power allocation in constrained multicarrier systems: the single-user case
EURASIP Journal on Advances in Signal Processing
Practical algorithms for a family of waterfilling solutions
IEEE Transactions on Signal Processing
Fundamental limits of spectrum-sharing in fading environments
IEEE Transactions on Wireless Communications
Achievable rates in cognitive radio channels
IEEE Transactions on Information Theory
COGNITIVE RADIOS FOR DYNAMIC SPECTRUM ACCESS - Dynamic Spectrum Sharing: A Game Theoretical Overview
IEEE Communications Magazine
Toward secure distributed spectrum sensing in cognitive radio networks
IEEE Communications Magazine
Spectrum sharing for unlicensed bands
IEEE Journal on Selected Areas in Communications
RAC: Range Adaptive Cognitive Radio Networks
Computer Standards & Interfaces
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Underlay transmission in cognitive radio enables a secondary (unlicensed) system to utilize a frequency band of primary (licensed) system as long as the unlicensee interferes less than a certain threshold with the licensee. The secondary system needs to carefully consider not only its own channel to achieve a capacity gain by this sharing spectrum in multi-carrier systems, but also the interference channel to reduce interference at the primary receiver. In this paper, we formulate a capacity maximization problem of the secondary system under an interference-power constraint as well as a conventional transmit-power constraint, and propose an optimal power allocation policy in which we exploit a two-dimensional frequency-selectivity on both channels. Through extensive simulations, we compare the performance of optimal power allocation policy with that of equal power allocation policy and further investigate the effect of the primary's power allocation policy on the performance of the secondary system. Numerical results show that the optimal power allocation policy can achieve a higher capacity in more frequency-selective channels, compared to an equal power allocation policy. Interestingly, a water-filling policy for the primary system also gives additional opportunities to the secondary system than the equal power allocation policy.