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Wireless Communications and Mobile Computing
Volume 2017, Article ID 7189090, 16 pages
https://doi.org/10.1155/2017/7189090
Research Article

On Carrier Sensing Accuracy and Range Scaling Laws in Nakagami Fading Channels

1School of Information, Central University of Finance and Economics, Beijing, China
2College of Information Engineering, Shenzhen University, Shenzhen, China
3School of Software, Beijing University of Technology, Beijing, China

Correspondence should be addressed to Liang Chen; nc.ude.uzs@nehcl

Received 6 April 2017; Revised 8 August 2017; Accepted 24 August 2017; Published 26 November 2017

Academic Editor: Xianfu Lei

Copyright © 2017 Yue Wang et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

We make a detailed study on carrier sensing of 802.11 in Nakagami fading channels. We prove that to maximize sensing accuracy, the optimal channel accessing probability is solely determined by the path-loss SIR (Signal to Interference Ratio). We define -interference range and -carrier sensing range for fading channels and prove that their scaling laws in Nakagami fading channels are similar to those in the static channel. The newly derived theoretical results show a unified property between the static and fading channels. By extensive simulations, we reveal that fading depresses the probability of a dominating transmission state, and therefore it can mitigate severe hidden and exposed terminal problems, but fading harms the average sensing accuracy for an optimally adjusted carrier sensing threshold.