Understanding the real-world performance of carrier sense
Proceedings of the 2005 ACM SIGCOMM workshop on Experimental approaches to wireless network design and analysis
Understanding and mitigating the impact of RF interference on 802.11 networks
Proceedings of the 2007 conference on Applications, technologies, architectures, and protocols for computer communications
Predictable 802.11 packet delivery from wireless channel measurements
Proceedings of the ACM SIGCOMM 2010 conference
Understanding 802.11 performance in heterogeneous environments
Proceedings of the 2nd ACM SIGCOMM workshop on Home networks
Airshark: detecting non-WiFi RF devices using commodity WiFi hardware
Proceedings of the 2011 ACM SIGCOMM conference on Internet measurement conference
Full length article: Empirical time and frequency domain models of spectrum use
Physical Communication
| Hi-index | 0.00 |
In this paper we focus on measuring channel occupancy in the 2.4 GHz ISM band in a way that transmissions from Wireless LAN stations and other spectrum users can be distinguished. Most current 802.11 hardware does not offer methods to capture channel occupancy caused by non-802.11 transmissions accurately. We therefore combine a commodity 802.11 Wireless LAN card with an inexpensive 2.4 GHz RF transceiver IC which we use for spectrum measurements. We build a probabilistic model which allows to calculate the overall channel occupancy and to determine the fractions of 802.11 and non-802.11 activity. Our model covers adjacent channel interference, detects both narrow-band and wide-band interferers, and adapts to different signal strengths. We evaluate our approach in a test bed with controlled interference, estimate the achievable precision, and identify open problems.