Title :
Power Allocation and Relay Selection for Cognitive Relay Networks with Primary QoS Constraint
Author :
Peng Lan ; Fenggang Sun ; Lizhen Chen ; Peng Xue ; Jialin Hou
Author_Institution :
Sch. of Inf. Sci. & Eng., Shandong Agric. Univ., Taian, China
Abstract :
In this letter, an optimal power allocation scheme between the secondary transmitter (ST) and secondary relay (SR) with best relay selection is proposed for a two-hop decode and forward cognitive relay network. Based on the joint consideration of the interference from ST and SR to the primary user (PU), the closed-form solution for optimal power allocation and relay selection (PARS) is presented under the quality of service (QoS) constraint of the PU transmission. Furthermore, a low complexity sub-optimal scheme is proposed. Simulation results verify the performance improvement of the proposed schemes.
Keywords :
cognitive radio; decode and forward communication; quality of service; relay networks (telecommunication); PU transmission; SR; ST; best relay selection; low-complexity suboptimal scheme; optimal power allocation scheme; primary QoS constraint; primary user; quality of service; secondary relay; secondary transmitter; two-hop decode-and-forward cognitive relay network; Cognitive radio; Interference; Quality of service; Relays; Resource management; Wireless sensor networks; Cognitive radio; decode and forward; power allocation; quality of service; relay selection;
Journal_Title :
Wireless Communications Letters, IEEE
DOI :
10.1109/WCL.2013.080813.130469
