Optimal power allocation for secondary users in CR networks

Naidu, Kalpana and Khan, Mohammed Zafar Ali and Desai, U B (2011) Optimal power allocation for secondary users in CR networks. In: IEEE Communications Society,Hewlett-Packard (HP),LSI,Adobe, 18-21, December 2011, Bengaluru; India.

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Cognitive Radio (CR) increases spectrum utilization by allowing unlicensed secondary users to concurrently operate with the licensed primary users. The side-lobes of an OFDM-based secondary user (SU) causes unwanted interference to the sub-carriers of OFDM-based primary user (PU). The objective is to assign power to the sub-carriers of SU in such a way that capacity of SU is maximized while satisfying the total power budget constraint and interference (introduced to the PU from SU) constraint. Previously, this power allocation to the SU's sub-carriers (i.e. convex optimization algorithm) was solved using KKT conditions & iterative algorithms. These algorithms maximize capacity asymptotically when the iterations are very large. In this paper, closed-form solution is presented that calculate the power allocation to the SU's sub-carriers. Simulation results are included which shows that complexity of the closed-form solution is small when compared to the complexity of the iterative algorithms.

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IITH Creators:
IITH CreatorsORCiD
Khan, Mohammed Zafar AliUNSPECIFIED
Item Type: Conference or Workshop Item (Paper)
Uncontrolled Keywords: Closed-form equations; Cognitive Radio; OFDM; PU; SU sub-carriers
Subjects: Physics > Electricity and electronics
Divisions: Department of Electrical Engineering
Depositing User: Team Library
Date Deposited: 29 Oct 2014 06:48
Last Modified: 26 Sep 2017 05:00
URI: http://raiith.iith.ac.in/id/eprint/505
Publisher URL: https://doi.org/10.1109/ANTS.2011.6163679
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