Measuring Indoor Mobile Wireless Link Quality

Published

June 14, 2009

Author(s)

Michael R. Souryal

Abstract

This paper investigates methods for link quality measurement of an indoor, time-varying wireless link. Link quality estimates are used for a number of higher-layer functions, including rate adaptation, routing, and topology control. The objective is to rapidly and efficiently estimate the current reliability of an RF link in terms of its packet success probability in the presence of a time-varying channel. We compare various approaches to estimating the current packet success rate (PSR), including packet counting and several methods employing physical layer signal-to-noise ratio (SNR) measurements. Among the SNR-based estimators, we consider those using a simple moving average, an exponential moving average, and a Yule-Walker predictor of the current SNR. The analysis shows that the SNR-based estimators are more efficient than packet counting methods in terms of the number of measurements needed, are more accurate when link quality variability increases, and are more flexible in terms of predicting the PSR for various bit rates and packet sizes. An important requirement, however, of the SNR-based estimators is a priori knowledge of the SNR-PSR relationship, which is environment- and radio-dependent. An efficient methodology for obtaining this mapping is presented.

Proceedings Title

IEEE ICC 2009

Conference Dates

November 30-December 4, 2008

Conference Location

Dresden, LA

Pub Type

Conferences

Download Paper

Local Download

Keywords

Channel estimation, Indoor, Link quality, Packet counting

Citation

Souryal, M. (2009), Measuring Indoor Mobile Wireless Link Quality, IEEE ICC 2009, Dresden, LA, [online], https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=152158 (Accessed April 18, 2024)