Multicarrier CDMA base station system and multi-code wave forming method therof

In a multi-code wave form generation method for a multicarrier mobile communication system including a base station provided with a base station control apparatus, a pilot signal modulation apparatus, a paging signal modulation apparatus, and a plurality of traffic signal modulation apparatuses and a mobile station provided with a mobile station control apparatus, a pilot signal receiving apparatus and an information receiving apparatus, an improved method, comprising the steps of:

• a first step for randomly generating phase values for phase transition of carriers from the base station control apparatus when a call set-up is requested;
• a second step for including the random phase values generated by the base station control apparatus into a paging information, transmitting the spread spectrum modulated paging signal to the mobile station and, at the same time, transiting the carrier phases of the spread spectrum modulated traffic signal by the phase value;
• a third step for converting the signal combining the spread spectrum modulated pilot signal, a paging signal and a traffic signal into a radio frequency;
• a fourth step for detecting the information of a code phase and carrier phases of the receiving signal from the transmitted pilot signal;
• a fifth step for demodulating a received paging signal using a code phase detected from the pilot signal and the predetermined phase information of each carrier and obtaining a phase information of each carrier of the traffic signal contained in the paging infromation;
• and
• a sixth step for demodulating a received traffic signal using a code phase of the obtained received pilot signal and a phase information of the carrier of the obtained from the paging information.

In a multicarrier mobile communication system having a base station and mobile station for transmitting the same data through a plurality of carriers and demodulating it, said base station comprising:

• a base station control means connected with an exchanger for generating random phase values as many as the number of carriers when a call set-up is requested and outputting a paging information containing the phase values;
• a pilot signal modulation means for generating, as many as the number of carriers, a spread spectrum modulated I-phase pilot signal and Q-phase pilot signal in accordance with a control of the base station control means;
• a paging signal modulation means for generating, as many as the number of carriers, a spread spectrum modulated I-phase paging signal and Q-phase paging signal having predetermined carrier phase differences compared to the pilot signal;
• a plurality of traffic signal modulation means for generating, as many as the number of carriers, spread spectrum modulated I-phase traffic signal and Q-phase traffic signal having carrier phase differences between the carriers as much as the phase transition values inputted from the base station control means compared to the pilot signal;
• a plurality of combining means for combining the I-phase signal and Q-phase signal, respectively, inputted from the modulation apparatus corresponding to each carrier;
• and
• a radio frequency transmission means for modulating the signals into a radio frequency using the I-phase signal and Q-phase signal inputted from the combining means corresponding to each carrier and transmitting the same, and said mobile station comprising:
• a pilot signal receiving means for detecting an information for a code phase of a received signal and a plurality of carrier phases;
• an information receiving means for demodulating the paging signal using the code phase of the received pilot signal and the carrier phase information, and demodulating a traffic signal using a carrier phase information of a traffic signal from the paging signal;
• and
• a mobile station control means for controlling the pilot signal receiving means and the information receiving means, computing plurality of carrier phases of the paging signal using a plurality of carrier phases of the received signal inputted from the pilot signal receiving means and outputting the same to the information receiving means, computing a plurality of carrier phase information of the traffic signal from the paging information demodulated by the information receiving means and outputting the same to the information receiving means.