Patent ID: 7212509
Filing Date: 2007-05-01
Classification: H03D,H03J,H04L

Abstract:
1. A method of correcting a frequency offset in a receiver of a base station of a data transmission system in which the base station sends data in time multiplex to several subscriber stations, and in which data transfer occurs from the subscriber stations to the base station in time multiplex with multiple access, comprising the steps of: a) setting, in each subscriber station, a reference frequency of a demodulator so that an output signal of a demodulator has no carrier frequency portion; b) for each subscriber station and for the base station, stipulating converter reference frequencies; c) for each subscriber station, calculating a calculated reference frequency for a modulator in the subscriber station from the reference frequency set for the demodulator in the subscriber station and from the stipulated converter reference frequencies under a condition that a carrier frequency, representing the frequency offset occurring in an output signal of the modulator in the base station, is set to zero; and d) setting an actual reference frequency for each modulator of each subscriber station to the calculated reference frequency for that modulator.