Transmitting apparatus, receiving apparatus, transmitting method, and receiving method

A transmission method comprising:

• generating, based on data, a first signal to be transmitted according to single carrier block transmission;
• generating, based a known signal, a second signal to be transmitted according to orthogonal frequency division multiplex transmission;
• controlling generation of the second signal such that, in a first transmission period, the known signal is a reference signal used for demodulating the first signal in the second transmission period and is arranged in discontinuous frequency bands assigned by a receiving apparatus for transmitting the known signal from a transmitting apparatus among frequency bands available in the orthogonal frequency division multiplex transmission;
• selecting and outputting the second signal in the first transmission period and the first signal in a second transmission period notified by the receiving apparatus;
• and
• transmitting the first signal and the second signal.

A receiving apparatus comprising:

• a scheduler configured to assign discontinuous frequency bands and transmission times within a predetermined period to at least one transmitting apparatus,
• wherein the scheduler sets, in the predetermined period, a first transmission period for orthogonal frequency division multiplex transmission and a second transmission period for single carrier block transmission,
• wherein the scheduler assigns the first transmission period for transmitting a known signal that is a reference signal used for demodulating the first signal in the second transmission period and is from the at least one transmitting apparatus, discontinuous frequency bands used for transmitting the known signal being arranged so as not to be overlapped among at least one transmitting apparatus, and
• wherein the scheduler assigns the second transmission period fhr transmitting data from the at least one transmitting apparatus;
• a transmitter configured to transmit, to the at least one transmitting apparatus, assignments by the scheduler;
• and
• a receiver configured to receive the known signal and the data from the at least one transmitting apparatus.