Transmission apparatus, reception apparatus, and relay apparatus

A reception apparatus included in a communication system together with a transmission apparatus and configured to receive, from the transmission apparatus, a multiplexed signal obtained by multiplexing data of M (M is a natural number equal to or larger than 2) channels, the reception apparatus comprising:

• a synchronizing unit configured to remove designated timing offset values from the multiplexed signal;
• a separating unit configured to separate the multiplexed signal, from which the timing offset values are removed, into M data for the respective channels;
• and
• a control unit configured to calculate the timing offset values based on a known value based on a number of channels in the communication system and output the timing offset values to the synchronizing unit.

A transmission apparatus included in a communication system together with a reception apparatus and configured to multiplex data from M (M is a natural number equal to or larger than 2) channels and transmit the data to the reception apparatus, the transmission apparatus comprising:

• M parallel converting units configured to respectively receive inputs of the data from the different channels and convert the input data from serial data into parallel data;
• M Fourier transform units configured to respectively receive inputs of the data from the different parallel converting units and apply Fourier transform processing to the input data;
• M phase rotating units configured to respectively receive inputs of the data from the different Fourier transform units and add phase rotation amounts based on a number of channels to the input data;
• a multiplexing unit configured to multiplex the M data to which the phase rotation amounts are added and output a multiplexed signal;
• an inverse Fourier transform unit configured to apply inverse Fourier transform processing to the multiplexed signal;
• a serial converting unit configured to convert a signal subjected to the inverse Fourier transform processing from parallel data into serial data;
• and
• a phase-rotation calculating unit configured to calculate, based on a known value based on a number of channels in the communication system, different phase rotation amounts for the respective M phase rotating units and output the calculated phase rotation amounts to the respective phase rotating units.

A transmission apparatus included in a communication system together with a reception apparatus and configured to multiplex data from M (M is a natural number equal to or larger than 2) channels and transmit the data to the reception apparatus, the transmission apparatus comprising:

• M parallel converting units configured to respectively receive inputs of the data from the different channels and convert the input data from serial data into parallel data;
• M Fourier transform units configured to respectively receive inputs of the data from the different parallel converting units and apply Fourier transform processing to the input data;
• M phase rotating units configured to respectively receive inputs of the data from the different Fourier transform units and add phase rotation amounts based on a number of channels to the input data;
• M inverse Fourier transform units configured to respectively receive inputs of the data from the different phase rotating units and apply inverse Fourier transform processing to the input data;
• a multiplexing unit configured to multiplex the M data subjected to the inverse Fourier transform and output a multiplexed signal;
• a serial converting unit configured to convert the multiplexed signal from parallel data into serial data;
• and
• a phase-rotation calculating unit configured to calculate, based on a known value based on a number of channels in the communication system, different phase rotation amounts for the respective M phase rotating units and output the calculated phase rotation amounts to the respective phase rotating units.

A reception apparatus included in a communication system together with a transmission apparatus and configured to receive, from the transmission apparatus, a multiplexed signal obtained by multiplexing data of M (M is a natural number equal to or larger than 2) channels, the reception apparatus comprising:

• a separating unit configured to separate the multiplexed signal into M data for the respective channels;
• M phase reverse rotating units configured to respectively receive inputs of the different separated data and remove designated phase rotation amounts;
• and
• a control unit configured to calculate the phase rotation amounts based on a known value based on a number of channels in the communication system and output the calculated phase rotation amounts to the respective phase reverse rotating units.

A relay apparatus configured to relay a multiplexed signal obtained by multiplexing data of M (M is a natural number equal to or larger than 2) channels in a communication system in which a transmission apparatus transmits the multiplexed signal and a reception apparatus receives the multiplexed signal, the relay apparatus comprising:

• a synchronizing unit configured to remove timing offset values based on a number of channels from the multiplexed signal;
• a separating unit configured to separate the multiplexed signal, from which the timing offset values are removed, into M data for the respective channels;
• M timing offset units configured to respectively receive inputs of the different separated data and insert the designated timing offset values in the input data;
• a multiplexing unit configured to multiplex the M data subjected to the timing offset and output the multiplexed signal;
• and
• a timing-offset calculating unit configured to calculate, based on a known value based on a number of channels in the communication system, different timing offset values for the respective M timing offset units, output the calculated timing offset values to the respective timing offset units, and further output the timing offset values to the synchronizing unit.

A relay apparatus configured to relay a multiplexed signal obtained by multiplexing data of M (M is a natural number equal to or larger than 2) channels in a communication system in which a transmission apparatus transmits the multiplexed signal and a reception apparatus receives the multiplexed signal, the relay apparatus comprising:

• a separating unit configured to separate the multiplexed signal into M data for the respective channels;
• M phase reverse rotating units configured to respectively receive inputs of the different separated data and remove phase rotation amounts based on a number of channels;
• M parallel converting units configured to respectively receive inputs of the data from the different phase reverse rotating units and convert the input data from serial data into parallel data;
• M Fourier transform units configured to respectively receive inputs of the data from the different parallel converting units and apply Fourier transform processing to the input data;
• M phase rotating units configured to respectively receive inputs of the data from the different Fourier transform units and add phase rotation amounts based on a number of channels to the input data;
• a multiplexing unit configured to multiplex the M data to which the phase rotation amounts are added and output the multiplexed signal;
• an inverse Fourier transform unit configured to apply inverse Fourier transform processing to the multiplexed signal;
• a serial converting unit configured to convert a signal subjected to the inverse Fourier transform processing parallel data into serial data;
• and
• a phase-rotation calculating unit configured to calculate, based on a known value based on a number of channels in the communication system, different phase rotation amounts for the respective M phase rotating units and output the calculated phase rotation amounts to the respective phase rotating units, and further output the calculated phase rotation amounts to the respective phase reverse rotating units.