Patent ID: 6091786
Filing Date: 2000-07-18
Classification: H04L

Abstract:
A method in a communication receiver for estimating a symbol timing and a carrier frequency of a received data signal, the method comprising the steps of:receiving at least one modulated signal;demodulating the at least one modulated signal to recover a timing signal and a data signal comprising a plurality of data symbols;determining a rough symbol timing from the timing signal;forming a timing-carrier search matrix comprising the step ofcomputing from the plurality of data symbols a plurality of signal quality metrics as a function of a plurality of predetermined trial variations of the carrier frequency about a nominal carrier frequency and as a function of a plurality of predetermined trial variations of the symbol timing about the rough symbol timing; andmaking an estimate of the symbol timing and an estimate of the carrier frequency by locating a minimum one of the plurality of signal quality metrics in the timing-carrier search matrix.