초록 ▼

With a CDMA mobile communication system of the present invention, the phase difference sensing circuit of the base station senses the phase difference with respect to a reference phase from the cross-correlation value of the up-link channel signals coming from mobile stations and sends timing contro

With a CDMA mobile communication system of the present invention, the phase difference sensing circuit of the base station senses the phase difference with respect to a reference phase from the cross-correlation value of the up-link channel signals coming from mobile stations and sends timing control information for compensating the phase difference closer to zero to the mobile stations. Then, in each of the mobile stations, the transmission timing control circuit variably sets the amount of delay in the delay circuit of the modulation circuit according to the timing control information sent from the base station. This enables the transmission timing of the transmission signal of each of the mobile stations to undergo delay control, maintaining the orthogonality between the individual up-link channel signals at the base station.

대표청구항 ▼

[ I claim:] [1.] A CDMA communication system comprising:a base station that transmits a down-link channel signal to a specific radio area; anda plurality of mobile stations that receive the down-link channel signal transmitted from the base station and subject up-link channel signals to spectrum spr

[ I claim:] [1.] A CDMA communication system comprising:a base station that transmits a down-link channel signal to a specific radio area; anda plurality of mobile stations that receive the down-link channel signal transmitted from the base station and subject up-link channel signals to spectrum spread using orthogonal codes and then transmit the resulting signals to the base station, whereinsaid base station comprises:sensing means for sensing a phase difference between a reception phase of the orthogonal code of the up-link channel signal received by said base station and a reference phase generated by said base station, wherein when each of the up-link channel signals coming from the mobile stations has a plurality of paths, said sensing means selects the path where the reception level is the largest from the plurality of paths for each up-link channel signal and then senses the phase difference between the reception phase of the selected paths and the reference phase; andnotifying means for creating timing control information for bringing the phase difference sensed by the sensing means closer to zero and notifying the timing control information to the relevant mobile station; andeach of said plurality of mobile stations comprises:control information reception means for receiving the timing control information notified by said base station; andtransmission timing control means for controlling the transmission timing of an up-link channel signal transmitted to said base station according to the timing control information received by said control information reception means.