PREAMBLE SEARCHING APPARATUS AND METHOD

摘要

An apparatus and method for searching for preambles in a base station of a mobile telecommunications system employing a CDMA system. The method comprises the steps of inputting oversampled samples of each chip associated with a first antenna from an access slot boundary and storing the inputted samples in a first buffer, inputting oversampled samples of each chip associated with a second antenna after the lapse of a predetermined delay from the access slot boundary and storing the inputted samples in a second buffer, reading samples in a period of a plurality of chips from the first and second buffers and correlating the read samples with scramble codes to generate signatures corresponding respectively to a plurality of hypotheses, calculating an accumulated energy value of each of the signatures, and sorting the signatures by identical ones and selecting one with a maximum accumulated energy value from among the sorted signatures.