DocumentCode :
2179006
Title :
Opportunistic spectrum sharing using dumb basis patterns: The Line-of-Sight interference scenario
Author :
Alaa, Ahmed M. ; Ismail, Mahmoud H. ; Tawfik, Hazim
Author_Institution :
Dept. of Electron. & Commun. Eng., Cairo Univ., Cairo, Egypt
fYear :
2015
fDate :
16-19 Feb. 2015
Firstpage :
445
Lastpage :
450
Abstract :
We investigate a spectrum-sharing system with non-severely faded mutual interference links, where both the secondary-to-primary and primary-to-secondary channels have a Line-of-Sight (LoS) component. Based on a Rician model for the LoS channels, we show, analytically and numerically, that LoS interference hinders the achievable secondary user capacity. This is caused by the poor dynamic range of the interference channels fluctuations when a dominant LoS component exists. In order to improve the capacity of such system, we propose the usage of an Electronically Steerable Parasitic Array Radiator (ESPAR) antenna at the secondary terminals. By viewing the orthonormal patterns of an ESPAR antenna as multiple virtual dumb antennas, we randomly vary their weights over time creating artificial channel fluctuations that can perfectly eliminate the undesired impact of LoS interference. Because the proposed scheme uses a single RF chain, it is well suited for compact and low cost mobile terminals.
Keywords :
Rician channels; antenna arrays; radio spectrum management; radiofrequency interference; Rician model; dumb basis patterns; electronically steerable parasitic array radiator antenna; line-of-sight interference scenario; non-severely faded mutual interference links; opportunistic spectrum sharing; primary-to-secondary channels; secondary user capacity; secondary-to-primary channels; virtual dumb antennas; Antenna radiation patterns; Interference channels; Member and Geographic Activities Board committees; Receivers; Rician channels; Vectors;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Computing, Networking and Communications (ICNC), 2015 International Conference on
Conference_Location :
Garden Grove, CA
Type :
conf
DOI :
10.1109/ICCNC.2015.7069385
Filename :
7069385
Link To Document :
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