Patent ID: 6788669
Filing Date: 2004-09-07
Classification: H04B,H04W

Abstract:
A CDMA demodulating apparatus for demodulating a CDMA burst signal sent by random access and containing communication control data, said apparatus comprising:timing detection means which detects de-spreading timing of said CDMA burst signal bas ed o n a correlation value between said CDMA burst signal and a reference code; delay means which delays said CDMA burst signal for at least a timing detection time configured to allow a detection of the de-spreading time by said timing detection means; first de-spreading means which, at the de-spreading timing detected by said timing detection means, de-spreads a second-half portion of a CDMA burst signal not delayed by said delay means which begins after a lapse of said timing detection time, thereby generating a second-half demodulated signal; second de-spreading means which, in parallel with the de-spreading by said first de-spreading means and at the de-spreading timing detected by said timing detection means, de-spreads a first-half portion of said CDMA burst signal delayed by said delay means which extends from the beginning of said CDMA burst signal to the beginning of said second-half portion, thereby generating a first-half demodulated signal; and reconstructing means which selects s aid first-half demodulated signal generated by said second de-spreading means and, upon completion of said selection, selects said second-half demodulated signal in succession to said first-half demodulated signal, thereby obtaining a demodulated signal corresponding to said CDMA burst signal in its entirety.