Patent ID: 6831941
Filing Date: 2004-12-14
Classification: H04B,H04L

Abstract:
A method for reducing transmission errors in a CDMA communication system having at least two communication units, comprising:receiving at a first communication unit a CDMA communication signal sent from a second communication unit; analyzing said received signal for phase errors and carrier offset correction, the analyzing for phase errors includes despreading the CDMA communication signal to produce a channel signal, converting the produced channel signal to hard symbols and taking a complex conjugate of the hard symbols to produce a phase correction signal, and the analyzing for carrier offset correction includes despreading the CDMA communication signal to produce a pilot signal and processing the produced pilot signal with a phase lock loop to produce a carrier offset correction signal; correcting said received signal with the phase correction signal and the carrier offset correction signal; and using the phase correction signal and the carrier offset correction signal to pre-rotate a signal by mixing the phase correction signal with an in-phase and quadrature version of a transmission signal prior to modulation to radio frequency and pre-offset a carrier using the carrier offset prior to transmission from said first communication unit to said second communication unit.