Decentralized SINR Balancing in Cognitive Radio Networks

• Published in: IEEE transactions on vehicular technology Vol. 66; no. 4; pp. 3491 - 3496
• Main Authors: Dhifallah, Oussama, Dahrouj, Hayssam, Al-Naffouri, Tareq Y., Alouini, Mohamed-Slim
• Format: Journal Article
• Language: English
• Published: New York IEEE 01.04.2017; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Alternating direction method of multipliers; Array signal processing; Cognitive radio; cognitive radio (CR) network; Data exchange; Distributed algorithms; distributed implementation; Frequencies; Interference; limited information exchange; maximizing the minimum signal-to-interference-plus-noise ratio (SINR); Optimization; Radio transmitters; Signal to noise ratio; Transmitters
• ISSN: 0018-9545; 1939-9359
• DOI: 10.1109/TVT.2016.2587753

This paper considers the downlink of a cognitive radio (CR) network formed by multiple primary and secondary transmitters, where each multiantenna transmitter serves a preknown set of single-antenna users. This paper assumes that the secondary and primary transmitters can simultaneously transmit their data over the same frequency bands to achieve high system spectrum efficiency. This paper considers the downlink balancing problem of maximizing the minimum signal-to-interference-plus-noise ratio (SINR) of the secondary transmitters subject to both the total power constraint of the secondary transmitters and the maximum interference constraint at each primary user due to secondary transmissions. This paper proposes solving the problem using the alternating direction method of multipliers, which leads to a distributed implementation through limited information exchange across the coupled secondary transmitters. This paper additionally proposes a solution that guarantees feasibility at each iteration. Simulation results demonstrate that the proposed solution converges to the centralized solution in a reasonable number of iterations.