DocumentCode :
3595177
Title :
Interference-free proactive channel gain estimation in cognitive radio
Author :
Mengsheng Rui ; Lin Zhang ; Guodong Zhao ; Gang Wu ; Shaoqian Li
Author_Institution :
YCES, Univ. of Electron. Sci. & Technol. of China, Chengdu, China
fYear :
2014
Firstpage :
453
Lastpage :
458
Abstract :
Recently, a proactive estimation method has been proposed to obtain the cross-channel gain from cognitive transmitter (CT) to primary receiver (PR), where CT acts as a full-duplex amplified-and-forward (AF) relay for primary users. However, since the cognitive and primary users usually have no cooperation, it has no guarantee that the direct and relay signals are synchronized, i.e, the time delay between direct and relay signals may be randomly large or small. This may cause interference to PR. In this paper, we analyze the impacts of the small and large time delays on proactive estimation, and propose an interference-free method to estimate the cross-channel gain. Simulation results demonstrate that the proposed method obtains about 5% estimation error with about 99% interference-free probability.
Keywords :
amplify and forward communication; channel estimation; cognitive radio; error statistics; interference suppression; radio receivers; radio transmitters; relay networks (telecommunication); wireless channels; CT user; PR user; amplified and forward relay; cognitive radio; cognitive transmitter; estimation error; full-duplex AF relay; interference free probability; interference-free proactive cross-channel gain estimation method; primary receiver; time delay; Delay effects; Estimation; Fading; Gain; Interference; Relays; Signal to noise ratio;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Personal, Indoor, and Mobile Radio Communication (PIMRC), 2014 IEEE 25th Annual International Symposium on
Type :
conf
DOI :
10.1109/PIMRC.2014.7136208
Filename :
7136208
Link To Document :
بازگشت