Title :
Optimal and suboptimal algorithms for Doppler spread estimation in mobile radio systems
Author :
Krasny, Leonid ; Arslan, Hüseyin ; Koilpillai, David ; Chennakeshu, Sandeep
Author_Institution :
Ericsson Inc., Research Triangle park, NC, USA
Abstract :
Doppler spread estimation in digital mobile radio systems is described. An optimal approach (in the sense of maximum likelihood estimation) for Doppler spread estimation is derived. Suboptimal approaches, with trading off in performance and complexity, are developed from the optimal algorithm. In practical systems, the Doppler spread must be estimated in the presence of frequency offsets between the transmitter and the receiver. Hence, an algorithm that decouples Doppler estimation from automatic frequency compensation (AFC) is also presented. The proposed algorithms rely on channel estimation over the known fields of a TDMA burst. Such algorithms can be applied easily to systems with pilot symbols or a pilot channel
Keywords :
Doppler effect; computational complexity; digital radio; land mobile radio; maximum likelihood estimation; optimisation; time division multiple access; Doppler spread estimation; MLE; TDMA burst; automatic frequency compensation; complexity; digital mobile radio systems; frequency offsets; maximum likelihood estimation; optimal algorithm; performance; pilot channel; pilot symbols; receiver; suboptimal algorithm; transmitter; Autocorrelation; Bandwidth; Channel estimation; Filtering; Filters; Frequency estimation; Land mobile radio; Maximum likelihood estimation; Radio transmitters; Receivers;
Conference_Titel :
Personal, Indoor and Mobile Radio Communications, 2000. PIMRC 2000. The 11th IEEE International Symposium on
Conference_Location :
London
Print_ISBN :
0-7803-6463-5
DOI :
10.1109/PIMRC.2000.881628