Title :
Probing techniques and estimation processes for fine-time synchronization of FH systems
Author :
Mason, Loyd J. ; Felstead, E. Barry
Author_Institution :
Commun. Res. Centre, Ottawa, Ont., Canada
fDate :
6/1/1993 12:00:00 AM
Abstract :
Five methods for estimating the time error in a frequency-hopped spread-spectrum (FHSS) system are analyzed and compared. These methods are based upon estimation of the second-order moments of the envelope-detected, match-filtered, received signal. The performance of these estimators is determined as a function of the Gaussian noise level and of the number of samples L used to form the estimate. The estimator mean and standard deviation are approximated by means of the central limit theorem. Solutions compare favorably with simulation results. Results for signal-to-noise ratios of 0, 5, and 10 dB and with L between 1 and 512 show that these estimators are superior to previously known methods
Keywords :
frequency agility; spread spectrum communication; 0 dB; 10 dB; 5 dB; FHSS; Gaussian noise; central limit theorem; envelope-detected; estimation processes; fine-time synchronization; frequency-hopped spread-spectrum; match-filtered; mean; probing techniques; received signal; second-order moments; signal-to-noise ratios; simulation results; standard deviation; time error; Clocks; Delay estimation; Frequency division multiaccess; Frequency shift keying; Frequency synchronization; Matched filters; Phase estimation; Satellites; Signal processing; Transmitters;
Journal_Title :
Communications, IEEE Transactions on
