APPARATUS AND METHOD FOR ESTIMATING UPLINK FREQUENCY OFFSET IN WIRELESS COMMUNICATION SYSTEM

摘要

A method and an apparatus for estimating an uplink frequency offset in a wireless communication system are provided to prevent resource waste by using a random access channel for estimating the uplink frequency offset. A base station of a wireless communication system uses a random access channel having two sequences. A channel receiver(404) extracts samples corresponding to the two sequences from a received random access channel signal. A correlator correlates predetermined former and following samples with a predetermined sequence to calculate first and second correlation values. A frequency offset estimator(422) divides the second correlation value by the first correlation value to estimate a frequency offset. The correlator includes a code generator, a conjugate generator(416) and first and second multipliers(408,412). The conjugate generator outputs complex conjugates of the sequences from the code generator. The first and second multipliers generate the first and second correlation values.