Paper Info
Title
Estimation of the velocity of mobile units in microcellular systems using the instantaneous frequency of the received signals
Abstract
1. ABSTRACT Handover processes in micro-cellular systems are more in- volved than in cellular systems. In particular, micro-cellular systems suffer from the so-called corner effect where line- of-sight between the mobile station and the base station is suddenly lost when the mobile rounds a corner. As a result, the received signal drops rapidly below threshold level and the call can be lost. It has been shown that, if an accurate estimation of the velocity of the mobile unit is available, the call can be rescued by applying short temporal window averaging on the received signal. Current methods for es- timating the velocity of mobile units in micro-cellular sys- tems are based on the level crossing rate of the envelope of the received signals. This paper presents a new velocity esti- mator based on the instantaneous frequency of the received signal. The performance of the proposed estimator is shown to be superior to that of the level crossing rate method. The average relative error of the proposed estimator is down to below 8% whereas that of the LCR method reaches 14%.
Year
DOI
Venue
2001
10.1109/ICASSP.2001.941093
ICASSP
Keywords
Field
DocType
mobile station,mobile round,threshold level,instantaneous frequency,proposed estimator,lcr method,base station,mobile unit,microcellular system,new velocity estimator,current method,maximum likelihood estimator,base stations,handover,random processes,relative error,frequency,signal processing,fading,scattering,maximum likelihood estimation
Base station,Mathematical optimization,Telecommunications,Level crossing,Mobile station,Computer science,Algorithm,Instantaneous phase,Below threshold level,Handover,Approximation error,Estimator
Conference
ISBN
Citations 
PageRank 
0-7803-7041-4
1
0.48
References 
Authors
1
3
Name
Order
Citations
PageRank
Ghasem Azemi1524.38
Bouchra Senadji218620.93
B. Boashash31325248.40