Spread spectrum communication apparatus and telephone exchange system

A spread spectrum communication apparatus comprising:

• reception means for receiving a reception signal;
• generation means for generating a plurality of different despread codes in parallel;
• demodulation means for demodulating the reception signal using the plurality of despread codes generated by said generation means, respectively;
• and
• conversion means for converting the reception signal demodulated by said demodulation means into parallel bits.

A spread spectrum transmission apparatus comprising:

• generation means for generating a plurality of spread codes;
• demultiplexing means for demultiplexing transmission information, generated by multiplexing data from a plurality of channels, to data from each of the plurality of channels;
• spread means for spreading the data from each of the plurality of channels demultiplexed by said demultiplexing means on the basis of the plurality of spread codes generated by said generation means;
• and
• transmission means for transmitting the data from the plurality of channels spread by said spread means.

A spread spectrum reception apparatus comprising:

• reception means for receiving a reception signal;
• generation means for generating a plurality of despread codes;
• a plurality of despread means for despreading the reception signal on the basis of the plurality of despread codes generated by said generation means, respectively;
• supply means for supplying the reception signal to said plurality of despread means;
• and
• conversion means for converting a plurality of outputs of the plurality of despread means into parallel data.

A spread spectrum communication apparatus comprising:

• first generation means for generating a first spread code;
• a plurality of delay means for delaying the first spread code to generate a plurality of spread codes having different phases;
• modulation means for modulating transmission information signals of a plurality of parallel channels using the plurality of spread codes generated by said plurality of delay;
• accumulation means for accumulating the signals of the channels modulated by said modulation means;
• second generation means for generating a second spread code;
• multiplication means for multiplying a signal accumulated by said accumulation means with the second spread code generated by said second generation means;
• and
• transmission means for transmitting the signal multiplied by said multiplication means.

A spread spectrum communication apparatus comprising:

• first generation means for generating a first inverse spread code;
• second generation means for generating a second inverse spread code;
• correlation means for checking a correlation between the second inverse spread code and a reception signal;
• third generation means for delaying the first inverse spread code according to the correlation between the second inverse spread code and the reception signal to generate a plurality of inverse spread codes having different phases;
• and
• modulation means for parallelly modulating the reception signal using the plurality of inverse spread codes generated by said third generation means.

A telephone exchange system having an extension connected by radio, comprising:

• reception means for receiving a signal from a terminal;
• demodulation means for despreading the signal received by said reception means to demodulate the signal into a speech signal;
• exchange means for exchanging the speech signal demodulated by said demodulation means;
• transmission means for transmitting the speech signal exchanged by said exchange means to a communication partner;
• and
• control means for controlling said exchange means on the basis of the signal received by said reception means.

A telephone exchange system having an extension connected by radio, comprising:

• receiving means for receiving a speech signal from a communication partner;
• exchange means for exchanging the speech signal received by said receiving means;
• spread means for spreading the speech signal exchanged by said exchange means;
• and
• transmission means for transmitting the signal spread by said means to a terminal.

A telephone exchange system having an extension connected by radio, comprising:

• reception means for receiving a signal;
• demodulation means for despreading the signal received by said reception means to demodulate the signal into a speech signal;
• exchange means for exchanging the speech signal;
• control means for controlling said exchange means on the basis of the signal received by said reception means;
• spread means for spreading the speech signal exchanged by said exchange means;
• and
• transmission means for transmitting the signal spread by said spread means.

A telephone exchange system connected to a plurality of mobile terminals by radio, comprising:

• selection means for selecting one of a plurality of spread codes;
• information means for informing the spread code selected by said selection means to one of the plurality of mobile terminals by radio;
• demodulation means for despreading the signal from the mobile terminal informed by said information means in accordance with the spread code selected by selection means to demodulate the signal into a speech signal;
• and
• transmission means for transmitting the speech signal to a communication partner.

A telephone exchange system connected to a plurality of mobile terminals by radio, comprising:

• selection means for selecting one of a plurality of spread codes;
• receiving means for receiving a speech signal from a communication partner:
• exchange means for exchanging the speech signal received by said receiving means;
• modulation means for modulating the speech signal exchanged by said exchange means in accordance with the spread code selected by said selection means;
• and
• transmission means for transmitting the signal modulated by said modulation means.

A spread spectrum communication apparatus comprising:

• storage means for storing a plurality of sets of spread codes;
• selection means for selecting one set of the plurality of sets of spread codes stored in said storage means;
• and
• communication means for performing a communication on the basis of the set of spread codes selected by said selection means.

A spread spectrum transmission apparatus comprising:

• generation means for generating a plurality of different spread codes in parallel corresponding to parallel bits of transmission information;
• a plurality of modulation means for modulating parallel bits of transmission information using spread codes generated by said generation means;
• transmission means for transmitting output of said plurality of modulation means;
• wherein each of said plurality of modulation means modulates each bit of the parallel bits of transmission information using each of the plurality of spread codes.

A spread spectrum communication apparatus comprising:

• reception means for receiving a reception signal;
• generation means for generating a plurality of different despread codes in parallel;
• demodulation means for demodulating the reception signal using the plurality of despread codes generated by said generation means, to output a plurality of demodulated signals corresponding to the plurality of despread codes;
• multiplexing means for multiplexing the plurality of demodulated signals demodulated by said demodulation means to output a multiplexed signal;
• and
• transmission means for transmitting the multiplexed signal multiplexed by said multiplexing means via a digital signal line.