Patent ID: 6363130
Filing Date: 2002-03-26
Classification: H04L

Abstract:
A method of detecting an access burst in a TDMA communications system using differential modulation, the access burst including at least one predetermined sequence of NT consecutive identical symbols in a predetermined position in the burst, where NT is an integer greater than an integer L representing a number of symbol periods over which the system has channel dispersion, comprising sampling a received signal and detecting the predetermined sequence in the received signal by the steps of, for each of NT-L current symbol periods ending the predetermined sequence:predicting at least one sample of the received signal in the current symbol period from at least one sample of the received signal in the preceding symbol period assuming identity of symbols represented by the received signal in the current and preceding symbol periods; producing a squared distance between at least one sample of the received signal in the current symbol period and the predicted at least one sample; and comparing the squared distance with a threshold to determine said identity if the threshold is not exceeded.