Transmission device, reception device, wireless communication system, transmission control method, reception control method, and processor

A reception device configured to receive a plurality of signals addressed to a plurality of reception devices which are spatially multiplexed, the reception device comprising:

• a transmission mode determining unit configured to determine whether a signal received is a first signal addressed to a first reception device of the plurality of reception devices or a second signal addressed to a second reception device of the plurality of reception devices, the first signal having been subjected to a power suppression process of suppressing a power of a transmission signal from which an interference is cancelled, and the second signal being not subjected to the power suppression process;
• and
• an adaptive demodulator configured to demodulate the signal received based on a result of determination performed by the transmission mode determining unit,
• wherein the transmission mode determining unit is configured to obtain transmission mode information included in the signal received, the transmission mode information specifying the first reception device or the second reception device, and
• the transmission mode determining unit is configured to determine, based on the obtained transmission mode information, whether the signal received is the first or second signal.

A wireless communication system comprising:

• a transmission device configured to spatially multiplex and transmit a plurality of signals addressed to a plurality of reception devices;
• and
• a reception device configured to receive the plurality of signals transmitted from the transmission device,
• wherein the transmission device comprises:
• a multiplexed signal generator configured to determine whether to set each one of the plurality of reception devices to be a first reception device or a second reception device, a power suppression process of suppressing a power of a transmission signal from which an interference is cancelled being performed for the first reception device, the power suppression process being not performed for the second reception device, the multiplexed signal generator being configured to generate a multiplexed signal by multiplexing signals addressed to the plurality of reception devices, a first signal of the signals which is addressed to the first reception device having been subjected to the power suppression process, and a second signal of the signals which is addressed to the second reception device being not subjected to the power suppression process, and
• the multiplexed signal generator comprises:
• a modulo switch determining unit configured to determine whether to set each one of the plurality of reception devices to be the first reception device or the second reception device, and to generate and output first transmission mode information that specifies the first reception device and second transmission mode information that specifies the second reception device;
• and
• an adaptive modulo unit configured to generate the first and second signals based on the first and second transmission mode informations received from the modulo switch determining unit, and
• wherein the reception device comprises:
• a transmission mode determining unit configured to determine whether the signal received is the first or second signal;
• and
• an adaptive demodulator configured to demodulate the signal based on a result of determination performed by the transmission mode determining unit, and
• the transmission mode determining unit is configured to obtain transmission mode information included in the signal received, the transmission mode information specifying the first reception device or the second reception device, and
• the transmission mode determining unit is configured to determine, based on the obtained transmission mode information, whether the signal received is the first or second signal.

A transmission control method for a transmission device configured to spatially multiplex and transmit a plurality of signals addressed to a plurality of reception devices, the transmission control method comprising:

• determining whether to set each one of the plurality of reception devices to be a first reception device or a second reception device, a power suppression process of suppressing a power of a transmission signal from which an interference is cancelled being performed for the first reception device, the power suppression process being not performed for the second reception device;
• and
• generating a multiplexed signal by multiplexing signals addressed to the plurality of reception devices, a first signal of the signals which is addressed to the first reception device having been subjected to the power suppression process, and a second signal of the signals which is addressed to the second reception device being not subjected to the power suppression process,
• wherein generating the multiplexed signal comprises:
• determining whether to set each one of the plurality of reception devices to be the first reception device or the second reception device;
• generating first transmission mode information that specifies the first reception device and second transmission mode information that specifies the second reception device;
• and
• generating the first and second signals based on the first and second transmission mode informations generated.

A reception control method for a reception device configured to receive a plurality of signals addressed to a plurality of reception devices which are spatially multiplexed, the reception control method comprising:

• determining whether a signal received is a first signal addressed to a first reception device of the plurality of reception devices or a second signal addressed to a second reception device of the plurality of reception devices, the first signal having been subjected to a power suppression process of suppressing a power of a transmission signal from which an interference is cancelled, and the second signal being not subjected to the power suppression process;
• and
• demodulating the signal received based on a result of determination performed by the transmission mode determining unit,
• wherein determining whether the signal received is the first signal or the second signal comprises:
• obtaining transmission mode information included in the signal received, the transmission mode information specifying the first reception device or the second reception device, and
• determining, based on the obtained transmission mode information, whether the signal received is the first or second signal.

A processor to be used for a transmission device including a plurality of transmission antennas and configured to spatially multiplex and transmit a plurality of signals addressed to a plurality of reception devices, the processor comprising:

• a multiplexed signal generator configured to determine whether to set each one of the plurality of reception devices to be a first reception device or a second reception device, a power suppression process of suppressing a power of a transmission signal from which an interference is cancelled being performed for the first reception device, the power suppression process being not performed for the second reception device, the multiplexed signal generator being configured to generate a multiplexed signal by multiplexing signals addressed to the plurality of reception devices, a first signal of the signals which is addressed to the first reception device having been subjected to the power suppression process, and a second signal of the signals which is addressed to the second reception device being not subjected to the power suppression process,
• wherein the multiplexed signal generator comprises:
• a modulo switch determining unit configured to determine whether to set each one of the plurality of reception devices to be the first reception device or the second reception device, and to generate and output first transmission mode information that specifies the first reception device and second transmission mode information that specifies the second reception device;
• and
• an adaptive modulo unit configured to generate the first and second signals based on the first and second transmission mode informations received from the modulo switch determining unit.

A processor to be used for a reception device configured to receive a plurality of signals addressed to a plurality of reception devices which are spatially multiplexed, the reception device comprising:

• a transmission mode determining unit configured to determine whether a signal received is a first signal addressed to a first reception device of the plurality of reception devices or a second signal addressed to a second reception device of the plurality of reception devices, the first signal having been subjected to a power suppression process of suppressing a power of a transmission signal from which an interference is cancelled, and the second signal being not subjected to the power suppression process;
• and
• an adaptive demodulator configured to demodulate the signal received based on a result of determination performed by the transmission mode determining unit,
• wherein the transmission mode determining unit is configured to obtain transmission mode information included in the signal received, the transmission mode information specifying the first reception device or the second reception device, and
• the transmission mode determining unit is configured to determine, based on the obtained transmission mode information, whether the signal received is the first or second signal.