scholarly journals Energy-Efficient Power Allocation in Cognitive Radio Systems With Imperfect Spectrum Sensing

2016 ◽  
Vol 34 (12) ◽  
pp. 3466-3481 ◽  
Author(s):  
Gozde Ozcan ◽  
M. Cenk Gursoy ◽  
Nghi Tran ◽  
Jian Tang
Keyword(s):  
Cognitive Radio ◽  
Power Allocation ◽  
Spectrum Sensing ◽  
Energy Efficient ◽  
Cognitive Radio Systems ◽  
Radio Systems ◽  
Imperfect Spectrum Sensing ◽  
Efficient Power

Energy-Efficient Power Allocation for OFDM-Based Cognitive Radio Networks with Imperfect Spectrum Sensing

2013 ◽  
Vol 846-847 ◽  
pp. 635-642
Author(s):  
Er Qing Zhang ◽  
Si Xing Yin ◽  
Liang Yin ◽  
Shu Fang Li
Keyword(s):  
Cognitive Radio ◽  
Power Allocation ◽  
Spectrum Sensing ◽  
Energy Efficient ◽  
Rapid Development ◽  
Cognitive Radios ◽  
System Throughput ◽  
Dual Decomposition ◽  
Imperfect Spectrum Sensing ◽  
Efficient Power

With the rapid development of wireless network technologies and proliferation of related services such as multimedia applications, demands for wireless spectrum resources keep rising. Cognitive radio (CR) is a novel approach for better utilization of the scarce, already packed but highly underutilized radio spectrum. Meanwhile, exclusive functionalities such as spectrum sensing make energy efficiency (EE) a crucial issue in Cognitive Radios (CRs). In this paper, we focus on the energy-efficient power allocation for OFDM-based CRs with imperfect spectrum sensing. The EE maximization for secondary users (SUs) is formulated as a nonlinear fractional programming problem taking into account imperfect spectrum sensing such as miss detection and false alarm. Then by transforming the original problem into a parameter programming, the optimal power allocation is derived with the bisection search (BS) method and dual decomposition method (DDM). Simulation results illustrate the significant performance improvement of our scheme compared to an existing one with objective of maximizing system throughput rather than EE.

scholarly journals Energy-Efficient Power Loading for OFDM-Based Cognitive Radio Systems With Channel Uncertainties

2015 ◽  
Vol 64 (6) ◽  
pp. 2672-2677 ◽  
Author(s):  
Ebrahim Bedeer ◽  
Osama Amin ◽  
Octavia A. Dobre ◽  
Mohamed H. Ahmed ◽  
Kareem E. Baddour
Keyword(s):  
Cognitive Radio ◽  
Energy Efficient ◽  
Cognitive Radio Systems ◽  
Power Loading ◽  
Radio Systems ◽  
Efficient Power ◽  
Channel Uncertainties
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