Title :
A Rayleigh Doppler frequency estimator derived from maximum likelihood theory
Author :
Hansen, Henrik ; Affes, Sofiene ; Mermelstein, Paul
Author_Institution :
Dept. of Telecommun., Tech. Univ., Lyngby, Denmark
Abstract :
Reliable estimates of Rayleigh Doppler frequency are useful for the optimization of adaptive multiple access wireless receivers. The adaptation parameters of such receivers are sensitive to the amount of Doppler and automatic reconfiguration to the speed of terminal movement can optimize cell capacities in low and high speed situations. We derive a Doppler frequency estimator using the maximum likelihood method and Jakes model (1974) of a Rayleigh fading channel. This estimator requires an FFT and simple post-processing only. Its performance is verified through simulations and found to yield good results
Keywords :
Doppler effect; Rayleigh channels; cellular radio; channel capacity; fast Fourier transforms; frequency estimation; maximum likelihood estimation; multi-access systems; multipath channels; multiuser channels; radio receivers; signal processing; FFT; Jakes model; Rayleigh Doppler frequency estimator; Rayleigh fading channel; adaptation parameters; adaptive multiple access wireless receivers; automatic reconfiguration; cell capacities; high speed; low speed; maximum likelihood method; maximum likelihood theory; mobile channel; mobile receivers; multipath propagation; optimization; performance verification; post-processing; reliable estimates; simulations; terminal movement speed; Additive noise; Business; Fading; Frequency estimation; Maximum likelihood estimation; Oscillators; Performance gain; Rayleigh channels; Transmitters; Wireless sensor networks;
Conference_Titel :
Signal Processing Advances in Wireless Communications, 1999. SPAWC '99. 1999 2nd IEEE Workshop on
Conference_Location :
Annapolis, MD
Print_ISBN :
0-7803-5599-7
DOI :
10.1109/SPAWC.1999.783098
