Title :
Spectrum allocation and power control in OFDM-based cognitive radios with target SINR constraints
Author :
Popescu, Dimitrie C. ; Joshi, Deepak R. ; Dobre, Octavia A.
Author_Institution :
Dept. of Electr. & Comput. Eng., Old Dominion Univ., Norfolk, VA, USA
Abstract :
In this paper we consider OFDM-based cognitive radios (CR) with linear precoders at the transmitter and minimum mean square error (MMSE) filters at the receiver, and formulate joint spectral allocation and power control subject to specified target signal-to-interference+noise ratio (SINR) as a constrained optimization problem. We discuss necessary and sufficient conditions for the optimal solution of this problem and present an algorithm that incrementally adapts the OFDM transmitter to reach the optimal transmit precoder and power values where the specified target SINR is achieved with minimum power.
Keywords :
OFDM modulation; cognitive radio; least mean squares methods; power control; radio transmitters; telecommunication control; OFDM transmitter; OFDM-based cognitive radios; constrained optimization problem; joint spectral allocation; minimum mean square error filters; power control; spectrum allocation; target SINR constraints; Bit error rate; Cognitive radio; Interference; Joints; OFDM; Receivers; Signal to noise ratio;
Conference_Titel :
Signals, Systems and Computers (ASILOMAR), 2010 Conference Record of the Forty Fourth Asilomar Conference on
Conference_Location :
Pacific Grove, CA
Print_ISBN :
978-1-4244-9722-5
DOI :
10.1109/ACSSC.2010.5757867
