Patent ID: 6560298
Filing Date: 2003-05-06
Classification: H03J,H04L

Abstract:
A method of improving automatic frequency control (AFC) in a communication device, the method comprising the steps of:comparing the digital information with a known reference source so as to determine a frequency error; correlating the digital information with a list of predetermined symbol sequences and associated aliases until a correlation is found; selecting the alias error based on which of the predetermined symbol sequences and associated aliases was found in the correlating step; re-mapping the digital data based on the alias error so as to produce a corrected data stream; calculating a composite error including the frequency error and the alias error; and supplying the composite error to an automatic frequency control such that a range of convergence of the AFC is expanded to greater than Â±&pgr;/2m radians per symbol where m is the number of bits per symbol used in the communication device.