Patent ID: 6067314
Filing Date: 2000-05-23
Classification: H04B

Abstract:
A direct spread spectrum signal receiving apparatus for obtaining desired data by receiving a direct spread spectrum signal, converting the direct spread spectrum signal into a baseband signal, and multiplying the baseband signal by a code which is equal to a spread spectrum code signal used in spread processing on a transmission side, said apparatus comprising:correlation value detection means for detecting a correlation value between the received directed spread spectrum signal and each of a plurality of spread spectrum code signals of different frequencies;synchronism information detection means for monitoring a plurality of correlation values, detected by said correlation value detection means, for each of a plurality of samples of the spread spectrum code signals, and detecting a phase and a frequency of one of the samples having a largest correlation value;frequency correction means for detecting a frequency deviation caused in the received direct spread spectrum signal based on the frequency detected by said synchronism information detection means, and correcting a frequency of the baseband signal based on the detected frequency deviation; anddespread means for performing despread processing by detecting a phase difference between the received direct spread spectrum signal and the spread spectrum code signal based on the phase of the sample detected by said synchronism information detection means, making a phase of the baseband signal the frequency of which is corrected by said frequency correction means and a phase of the spread spectrum code signal coincident with each other, based on the phase of the sample detected by said synchronism information detection means, and multiplying the frequency corrected baseband signal and the spread spectrum code signal.