Title :
A Dual-Threshold Policy for Opportunistic Spectrum Access in Fading Channels
Author :
Xiaodong Peng ; Limin Xiao ; Xiaofeng Zhong ; Shidong Zhou
Author_Institution :
Dept. of Electron. Eng., Tsinghua Univ., Beijing, China
Abstract :
To improve the effective throughput of the secondary user in hierarchical networks, a dual-threshold policy based on channel quality information is proposed. The proposed policy can utilize the transmission opportunities with good channel quality not only in the sensed idle state but also in the sensed busy state of the channel. With this policy, an optimization problem maximizing the effective throughput of the secondary user with an interference constraint for protecting the primary user is formulated, and the optimal channel quality thresholds are derived. Numerical results validate that the effective throughput of the secondary user can be significantly improved by adopting the proposed policy.
Keywords :
fading channels; radio access networks; radiofrequency interference; channel quality information; dual-threshold policy; fading channels; opportunistic spectrum access; primary user; secondary user; Fading channels; Hierarchical systems; Interference; Optimization; Receivers; Signal to noise ratio; Throughput; Dual threshold; channel quality information; fading channels; opportunistic spectrum access;
Journal_Title :
Communications Letters, IEEE
DOI :
10.1109/LCOMM.2014.2331281
