METHOD AND APPARATUS FOR CARRIER PHASE TRACKING

摘要

A method and telecommunication system for tracking the carrier phase of a received signal (2, 4) includes the addition of a pilot signal (7) to the da ta component of the signal prior to modulation and transmission (100). The pilo t signal (230) is to have a frequency equal to the inverse of twice a data symbol interval with zero crossings positioned at the midpoint of each symbo l interval to avoid interference with the data. The received signal (230) is demodulated to produce a complex data signal from which the pilot signal is detected to provide an estimate of the phase error in the complex data signa l (230). The elimination of the phase error from the complex data signal is accomplished through a corrective phase shift (240) that is equal and opposi te to the estimated phase error.