Journal
IEEE TRANSACTIONS ON WIRELESS COMMUNICATIONS
Volume 15, Issue 4, Pages 2741-2755Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TWC.2015.2509069
Keywords
Cognitive radio; energy efficiency; ergodic capacity; fading channels; interference power constraint; minimum rate capacity; outage capacity; power allocation strategies; spectrum sharing; transmit power constraint
Funding
- Fundamental Research Funds for the Central Universities [7215433803, 7214433802, 7214514902]
- 863 Project [2014AA8098080E]
- 111 Project [B08038]
- Natural Science Foundation of China [61301179, 61401323, 61401338, 61471395]
- China Scholarship Council
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Green communications is an inevitable trend for future communication network design, especially for a cognitive radio network. Power allocation strategies are of crucial importance for green cognitive radio networks. However, energy-efficient power allocation strategies in green cognitive radio networks have not been fully studied. Energy efficiency maximization problems are analyzed in delay-insensitive cognitive radio, delay-sensitive cognitive radio, and simultaneously delay-insensitive and delay-sensitive cognitive radio, where a secondary user coexists with a primary user and the channels are fading. Using fractional programming and convex optimization techniques, energy-efficient optimal power allocation strategies are proposed subject to constraints on the average interference power, along with the peak/average transmit power. It is shown that the secondary user can achieve energy efficiency gains under the average transmit power constraint, in contrast to the peak transmit power constraint. Simulation results show that the fading of the channel between the primary user transmitter and the secondary user receiver and the fading of the channel between the secondary user transmitter and the primary user receiver are favorable to the secondary user with respect to the energy efficiency maximization of the secondary user, whereas the fading of the channel between the secondary user transmitter and the secondary user receiver is unfavorable to the secondary user.
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