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Optimal Power Allocation in Ofdm Based Cognitive Radio System

International Journal of Communication and Media Science
© 2014 by SSRG - IJCMS Journal
Volume 1 Issue 2
Year of Publication : 2014
Authors : K.Krishna veni
10.14445/2349641X/IJCMS-V1I2P103
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How to Cite?

K.Krishna veni, "Optimal Power Allocation in Ofdm Based Cognitive Radio System," SSRG International Journal of Communication and Media Science, vol. 1,  no. 2, pp. 12-15, 2014. Crossref, https://doi.org/10.14445/2349641X/IJCMS-V1I2P103

Abstract:

Efficient spectrum usage becomes critical issue when a variety of wireless communication device comes into wider use. The concept of cognitive radio based OFDM is used to solve the scarcity problem. To tackle the optimal power allocation problem in OFDM –based cognitive radio networks, the key is use gradient based power allocation method with well designed step size can approximate the optimal solution within a fewer iterations. The proposed gradient method taking into account the factors capacity of the user , interference constraints and channel gain which achieves optimal solution with low computational complexity of O(N).

Keywords:

Cognitive radio (CR), gradient descent, Orthogonal frequency- division multiplexing (OFDM), power allocation.

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