Patent ID: 7190747
Filing Date: 2007-03-13
Classification: H04B,H04L

Abstract:
1. A method of compensating for frequency mismatch between a receiver and each transmitter of a multiuser communication system having a plurality of users, the method comprising: calculating a phase error profile for a user, the phase error profile having at least one sloping section and at least one transition region associated with symbol drift and offset; calculating an estimate of the location of each transition region in the phase error profile; identifying transition region data that is above a predetermined threshold; eliminating the identified transition region data above the predetermined threshold from subsequent processing; calculating estimates of the symbol drifts and offsets associated with each sloping section; computing estimated symbol drift and offset aggregate results from the estimates of the symbol drifts and offsets; and compensating for frequency mismatch associated with the user based on the estimated symbol drift and offset aggregate results.