| 摘要 |
In a CDMA mobile communication system, upon occurrence of a call-connecting request, a mobile station sends a CDMA burst signal to a base station by random access. The base station detects de-spreading timing based on a correlation value between the CDMA burst signal and a reference code. Further, the base station delays the CDMA burst signal for a delay time equal to the time necessary for the detection of the timing. Upon detection of the de-spreading timing, the base station de-spreads the second-half portion of the CDMA burst signal from the midpoint to the end thereof, and at the same time, de-spreads the first-half portion of the delayed CDMA burst signal. By this, the demodulation time can be shorted as compared with that in the case of de-spreading the CDMA burst signal from its beginning to its end.
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