Title :
Optimal Power Allocation for Spectrum Sensing and Data Transmission in Cognitive Relay Networks
Author :
Huang, Shiwei ; Chen, Hongbin ; Zhang, Yan
Author_Institution :
Key Lab. of Cognitive Radio & Inf. Process., Guilin Univ. of Electron. Technol., Guilin, China
fDate :
2/1/2012 12:00:00 AM
Abstract :
In this letter, the problem of joint spectrum sensing and data transmission in a cognitive relay network is studied. An optimal power allocation (OPA) strategy is proposed to maximize the secondary throughput under both sensing performance and total power constraints. The OPA problem is transformed into seeking an optimal cognitive relay amplifying gain. Analytical and simulation results show that there indeed exists an optimal amplifying gain to achieve maximum secondary throughput under certain conditions. Furthermore, compared with equal power allocation (EPA), the throughput gain by OPA increases with the total power budget.
Keywords :
cognitive radio; data communication; optimisation; radio spectrum management; OPA problem; cognitive relay network; data transmission; joint spectrum sensing performance; maximum secondary throughput; optimal cognitive relay amplifying gain; optimal power allocation strategy; total power constraint; Cognitive radio; Data communication; Relays; Resource management; Sensors; Throughput; Cognitive relay networks; cooperative spectrum sensing; power allocation; throughput;
Journal_Title :
Wireless Communications Letters, IEEE
DOI :
10.1109/WCL.2012.120211.110056
