Link-level measurements from an 802.11b mesh network
Proceedings of the 2004 conference on Applications, technologies, architectures, and protocols for computer communications
IEEE 802.11 rate adaptation: a practical approach
MSWiM '04 Proceedings of the 7th ACM international symposium on Modeling, analysis and simulation of wireless and mobile systems
Design and Analysis of a Cooperative Medium Access Scheme for Wireless Mesh Networks
BROADNETS '04 Proceedings of the First International Conference on Broadband Networks
Wireless Communications & Mobile Computing - Special Issue: Emerging WLAN Apllications and Technologies
Experimental study of concurrent transmission in wireless sensor networks
Proceedings of the 4th international conference on Embedded networked sensor systems
PPR: partial packet recovery for wireless networks
Proceedings of the 2007 conference on Applications, technologies, architectures, and protocols for computer communications
Efficient channel-aware rate adaptation in dynamic environments
Proceedings of the 6th international conference on Mobile systems, applications, and services
Harnessing exposed terminals in wireless networks
NSDI'08 Proceedings of the 5th USENIX Symposium on Networked Systems Design and Implementation
CNSR '08 Proceedings of the Communication Networks and Services Research Conference
ACES: adaptive clock estimation and synchronization using Kalman filtering
Proceedings of the 14th ACM international conference on Mobile computing and networking
Cross-layer wireless bit rate adaptation
Proceedings of the ACM SIGCOMM 2009 conference on Data communication
Reducing average power in wireless sensor networks through data rate adaptation
ICC'09 Proceedings of the 2009 IEEE international conference on Communications
Murphy loves potatoes: experiences from a pilot sensor network deployment in precision agriculture
IPDPS'06 Proceedings of the 20th international conference on Parallel and distributed processing
AS-MAC: Utilizing the adaptive spreading code length for wireless sensor networks
ACM Transactions on Sensor Networks (TOSN)
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In many Wireless Sensor Network (WSN) applications, the availability of a simple yet accurate estimation of the RF channel quality is vital. However, due to measurement noise and fading effects, it is usually estimated through probe or learning based methods, which result in high energy consumption or high overheads. We propose to make use of information redundancy among indicators provided by the IEEE 802.15.4 system to improve the estimation of the link quality. A Kalman filter based solution is used due to its ability to give an accurate estimate of the un-measurable states of a dynamic system subject to observation noise. In this paper we present an empirical study showing that an improved indicator, termed Effective-SNR, can be produced by combining Signal to Noise Ratio (SNR) and Link Quality Indicator (LQI) with minimal additional overhead. The estimation accuracy is further improved through the use of Kalman filtering techniques. Finally, experimental results demonstrate that the proposed algorithm can be implemented on resource constraints devices typical in WSNs.