Pilot signal acquirement in code division multiple access radio telephone system, by comparing correlation energy with threshold energy until PN sequence timing which produces suitable correlation energy is found

摘要

A pseudo random noise (PN) offset for a PN sequence is selected from samples of received signal. A portion of samples is correlated with portion of PN sequence to produce correlation energy. Then, a new PN offset is chosen. Correlation energy is compared with threshold energy until PN sequence timing which produces correlation energy equivalent to threshold energy, is found. Independent claims are also included for the following: (a) method of activating radio telephone; (b) apparatus for acquiring pseudo random (PN) sequence timing; (c) CDMA cellular telephone system; (d) method of activating code division multiple access (CDMA) cellular telephone; (e) receiver circuit