Patent ID: 6188679
Filing Date: 2001-02-13
Classification: H04B

Abstract:
A CDMA chip synchronization circuit, which is provided for a receiver of a mobile communications system employing a code division multiple access (CDMA) method, said circuit adapted to receive an input signal, said circuit comprising:a search unit which detects a receiving timing based on a plurality of multipath components contained in said input signal;a plurality of receivers, a first receiver spreading said input signal based upon said receiving timing, each other receiver spreading said input signal based on a respective alternate receiving timing, each of said respective alternative receiving timings being a deviation from said receiving timing by prescribed intervals of time shorter than a 1-chip period, said receivers each producing a respective output as a result of said spreading;a memory which stores said outputs of said correlators; anda selector which periodically selects one of said outputs of said receivers that has a best receiving quality.