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Relay and Power Allocation Schemes for OFDM-Based Cognitive Radio Systems

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4 Author(s)
Bharadia, D. ; Stanford Univ., Stanford, CA, USA ; Bansal, G. ; Kaligineedi, P. ; Bhargava, V.K.

In this letter, we investigate the relay and power allocation problem for OFDM-based cognitive radio (CR) systems with single antennae. We propose a method where the capacity of CR user employing relays is maximized while total transmission power is kept within a budget and the interference introduced to the primary user (PU) band is kept within a prescribed threshold. The optimization problem is a mixed-integer problem, which is NP-hard. Hence in this letter, we have proposed three sub-optimal schemes. The presented numerical results show that the performance of proposed suboptimal schemes is close to the optimal solution.

Published in:

Wireless Communications, IEEE Transactions on  (Volume:10 ,  Issue: 9 )

Date of Publication:

September 2011

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