Wireless Communications: Principles and Practice
Wireless Communications: Principles and Practice
Bit and power allocation in constrained multicarrier systems: the single-user case
EURASIP Journal on Advances in Signal Processing
Optimal and Suboptimal Power Allocation Schemes for OFDM-based Cognitive Radio Systems
IEEE Transactions on Wireless Communications - Part 2
Cognitive radio: brain-empowered wireless communications
IEEE Journal on Selected Areas in Communications
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Conflict-free power allocation for secondary user (SU) in cognitive networks is a challenging problem since the accessible spectrum of the SU is shared with the primary user (PU); the problem becomes to be especially difficult when it is wanted to achieve the maximum network capacity considering the mutual interference between PU and SU. In this paper, specifying the single SU case with multiple PUs, the power allocation for the subcarriers of the SU is modeled into a single user water-filling framework, where the mutual interference between the PUs and the SU is comprehensively formulated into the restrictions on the SU's transmission power. As a result, proposed modeling scheme restrains the interference to the PUs as well as maximizes the capacity of the SU. Simulation results illustrate the influence of the mutual interference on the power allocation and the network capacity.