Communications method, communication apparatus, reception method, and reception apparatus

A multiple access receiving method using a multicarrier signal including a plurality of subcarriers of a predetermined number allocated with a predetermined frequency separation, comprising the steps of:

• multiplying a multicarrier signal transmitted from a transmitter with a time waveform output from inverse windowing data generating means and performing a windowing operation, wherein said time waveform has a length shorter than a time waveform generated in said transmitter;
• converting an output signal obtained in said step of multiplying said multicarrier signal into information including each of said plurality of subcarriers;
• multiplying a plurality of output signals obtained in said converting step by inverse random phase shift data and generating a plurality of codes;
• and
• coding processing a plurality of individual signals generated in said step of multiplying said plurality of output signals, wherein said coding processing calculates control data to be transmitted to said transmitter so that said transmitter controls a transmission output.

A multiple access transmitting apparatus using a multicarrier signal including a plurality of subcarriers of a predetermined number allocated with a predetermined frequency separation, comprising:

• coding processing means for processing a plurality of individual signals generated from a plurality of signal sources, respectively;
• first multiplier means for multiplying a plurality of output signals generated from said coding processing means by random phase shift data;
• converting means for converting an output signal from said first multiplying means into a multicarrier signal;
• second multiplier means for multiplying said multicarrier signal output from said converting means with a time waveform output from window data generating means and performing a windowing operation;
• and
• adder means for adding control data to said multicarrier signal according to a received signal for controlling a transmission of said multicarrier signal.

A multiple access receiving apparatus using a multicarrier signal including a plurality of subcarriers of a predetermined number allocated with a predetermined frequency separation, comprising:

• first multiplier means for multiplying a multicarrier signal transmitted from a transmitter with a time waveform output from inverse windowing data generating means and performing a windowing operation, wherein said time waveform has a length shorter than a time waveform generated in said transmitter;
• converting means for converting a signal output from said first multiplier means into an information signal including each of said plurality of subcarriers;
• second multiplier means for multiplying a plurality of output signals from said converting means by inverse random phase shift data and for generating a plurality of codes;
• and
• coding processing means for processing a plurality of individual signals generated from said second multiplier means, wherein said coding processing means calculates control data to be transmitted to said transmitter so that said transmitter controls a transmission output.