Patent ID: 7443942
Filing Date: 2008-10-28
Classification: H04B

Abstract:
1. A receiver of CDMA communications scheme, comprising: a matched filter which operates at a frequency of one-over-n (“n” is an integer) times a sampling frequency of a received signal and detects a path timing; and a finger section for despreading the received signal, wherein the finger section comprises a DLL which operates at the sampling frequency of the received signal and computes a difference value representing an offset between the received signal and a demodulation timing specified by the path timing detected by the matched filter; a timing adjustment section which outputs a timing signal of predetermined cycle while the path timing detected by the matched filter is taken as a reference, the timing adjustment section compensating for a phase of the timing signal on the basis of the difference value computed by the DLL; and a despread section which performs despreading operation at a demodulation timing specified by the timing signal output from the timing adjustment section, wherein the timing adjustment section causes the phase of the timing signal to advance when the magnitude of the difference value computed by the DLL exceeds a predetermined threshold value and when the difference value represents that the demodulation timing lags behind the received signal; and causes the phase of the timing signal to delay when the magnitude of the difference value computed by the DLL exceeds the predetermined threshold value and when the difference value represents that the demodulation timing is advanced in relation to the received signal.