DocumentCode :
2363502
Title :
Hyperexponential approximation of channel idle time distribution with implication to secondary transmission strategy
Author :
Liu, Yingxi ; Tewfik, Ahmed
Author_Institution :
Dept. of Electr. & Comput. Eng., Univ. of Texas at Austin, Austin, TX, USA
fYear :
2012
fDate :
10-15 June 2012
Firstpage :
1800
Lastpage :
1804
Abstract :
Channel idle time distribution (CITD) based secondary transmission strategies have been studied intensively in the literature. The performance of secondary devices are limited by the presumed CITD. But none of them provides a reasonable characterization of the CITD in reality. In this paper, we carefully examine the feature of the CITD using large amount of channel idle time data collected in various WLAN networks. It is demonstrated that the CITD can be well approximated by hyperexponential densities. Based on the estimated density, we propose a novel multiple-shot transmission strategy which takes advantage of the hyperexponential feature of the CITD. This strategy achieves at least twice the increase for the data we examine in average secondary access time compared to conventional transmission strategies.
Keywords :
approximation theory; exponential distribution; wireless LAN; wireless channels; CITD; WLAN network; channel idle time data collection; channel idle time distribution; density estimation; hyperexponential density approximation; multiple-shot transmission strategy; secondary device performance; secondary transmission strategy; Approximation algorithms; Approximation methods; Cognitive radio; Estimation; Wireless LAN; channel idle time distribution (CITD); cognitive radio; dynamic spectrum access (DSA); multiple exponentials;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Communications (ICC), 2012 IEEE International Conference on
Conference_Location :
Ottawa, ON
ISSN :
1550-3607
Print_ISBN :
978-1-4577-2052-9
Electronic_ISBN :
1550-3607
Type :
conf
DOI :
10.1109/ICC.2012.6363720
Filename :
6363720
Link To Document :
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