CLAIMS
1. A transmitting apparatus comprising:
a first signal generating unit to generate, on the basis of data, a first signal transmitted by single carrier block transmission;
a second signal generating unit to generate, on the basis of a known signal, a second signal transmitted by orthogonal frequency division multiplex transmission;
a switching operator to receive inputs of the first signal and the second signal, to select and output the second signal in a first transmission period, and to select and output the first signal in a second transmission period;
an antenna to transmit the signal output from the switching operator; and
a control unit to control the second signal generating unit such that, in the first transmission period, the known signal is arranged in a frequency band allocated for transmission of the known signal from the transmitting apparatus among frequency bands usable in the orthogonal frequency division multiplex transmission.
2. The transmitting apparatus according to claim 1,
wherein
the first signal generating unit includes:
a data generating unit to generate data; a time-frequency converting unit to convert the data into a frequency domain signal and output the frequency domain signal;
a first frequency-time converting unit to convert the frequency domain signal into a time domain signal and output the time domain signal; and
a first CP adding unit to add a Cyclic Prefix to the

signal output from the first frequency-time converting unit and output the signal to the switching operator as the first signal, and
the second signal generating unit includes:
a known-signal generating unit to generate the known signal;
an on-frequency arranging unit to arrange the known signal in a frequency band allocated for transmission of the known signal from the transmitting apparatus;
a second frequency-time converting unit to convert the signal output from the on-frequency arranging unit into the time domain signal; and
a second CP adding unit to add the Cyclic Prefix to the signal output from the second frequency-time converting unit and output the signal to the switching operator as the second signal.
3. The transmitting apparatus according to claim 2, wherein
when K is an integer equal to or larger than one, the transmitting apparatus includes K pieces of the antenna,
when M is an integer equal to or larger than one,
the first signal generating unit includes:
M pieces of each of the data generating unit and the time-frequency converting unit;
a first precoding unit to carry out first precoding processing for converting M pieces of the frequency domain signal output from the M time-frequency converting units into K signals corresponding to the K antennas, respectively; and
K pieces of the first frequency-time converting units and K pieces of the first CP adding unit,
the first frequency-time converting unit converts the

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signal after the first precoding processing into the time domain signal,
the second signal generating unit includes:
M pieces of the known-signal generating unit;
a second precoding unit to carry out second precoding processing for converting M pieces of the frequency domain signal output from the M known-signal generating unit into K signals corresponding to the K antennas, respectively; and
K pieces of the on-frequency arranging unit, K pieces of the second frequency-time converting unit, and K pieces of the second CP adding unit, and
the on-frequency arranging unit arranges the signal after the second precoding processing in a frequency band allocated for transmission of the known signal from the transmitting apparatus.
4. The transmitting apparatus according to claim 1, 2, or
3, wherein
the second transmission period is a period allocated for transmission of the data from the transmitting apparatus by an apparatus that performs resource allocation on one or more transmitting apparatuses including the transmitting apparatus such that transmission times from the one or more transmitting apparatuses do not overlap in a third transmission period, which is a period excluding the first transmission period in a fixed period.
5. The transmitting apparatus according to any one of
claims 1 to 4, wherein
the second signal generating unit further generates the second signal on the basis of a control signal, and
the control unit controls the second signal generating

unit such that, in the first transmission period, the control signal is arranged in a frequency band allocated for transmission of the control signal from the transmitting apparatus among frequency bands usable in the orthogonal frequency division multiplex transmission.
6. A receiving apparatus comprising: a scheduler to
carry out allocation processing for allocating frequency bands and transmission times in a fixed period to one or more transmitting apparatuses,
in the allocation processing, provide, in the fixed period, an orthogonal frequency division multiplex transmission period, which is a period in which orthogonal frequency division multiplex transmission is performed, and a period in which single carrier block transmission is performed,
allocate the orthogonal frequency division multiplex transmission period to a transmission time for transmission of a known signal from the one or more transmitting apparatuses,
allocate a frequency band for transmission of the known signal in the orthogonal frequency division multiplex transmission period to each of the one or more transmitting apparatuses such that frequency bands do not overlap among the one or more transmitting apparatuses, and
allocate a transmission time and a frequency band of the period in which the single carrier block transmission is performed to each of the one or more transmitting apparatuses for transmission of data;
a transmitting unit to transmit an allocation result by the allocation processing to the one or more transmitting apparatuses; and

a receiving unit to receive the data and the known signal transmitted from the one or more transmitting apparatuses.
7. The receiving apparatus according to claim 6, further
comprising:
a plurality of antennas capable of generating beams that irradiate in one or more irradiation directions; and
a beam control unit to switch the beams at intervals, each being of the fixed time, wherein
each of the one or more irradiating directions are directions corresponding to each of the one or more transmitting apparatuses, respectively.
8. The receiving apparatus according to claim 7, wherein
the antenna is capable of simultaneously generating a
first beam and a second beam, and
when a distance between a first transmitting apparatus set as an irradiating direction of the first beam and a second transmitting apparatus set as an irradiating direction of the second beam is equal to or smaller than a threshold, the scheduler allocates transmission times and frequency bands to the first transmitting apparatus and the second transmitting apparatus such that at least one of the transmission times and the frequency bands are different between the first transmitting apparatus and the second transmitting apparatus.
9. A transmitting method comprising:
a first step for generating, on the basis of data, a first signal transmitted by single carrier block transmission;
a second step for generating, on the basis of a known

signal, a second signal transmitted by orthogonal frequency division multiplex transmission;
a third step for controlling the second step such that, in the first transmission period, the known signal is arranged in a frequency band allocated for transmission of the known signal among frequency bands usable in the orthogonal frequency division multiplex transmission;
a fourth step for selecting, out of the first signal and the second signal, the second signal in the first transmission period and selecting the first signal in a second transmission period; and
a fifth step for transmitting the signal selected in the third step.
10. A receiving method comprising: a first step for
carrying out allocation processing for allocating a frequency band and a transmission time in a fixed period to one or more transmitting apparatuses,
in the allocation processing, providing, in the fixed period, an orthogonal frequency division multiplex transmission period, which is a period in which orthogonal frequency division multiplex transmission is performed, and a period in which single carrier block transmission is performed,
allocating the orthogonal frequency division multiplex transmission period to a transmission time for transmission of a known signal from the one or more transmitting apparatuses,
allocating a frequency band for transmission of the known signal in the orthogonal frequency division multiplex transmission period to each of the one or more transmitting apparatuses such that frequency bands do not

overlap among the one or more transmitting apparatuses, and
allocating a transmission time and a frequency band of the period in which the single carrier block transmission is performed to each of the one or more transmitting apparatuses for transmission of data;
a second step for transmitting an allocation result of the allocation processing to the one or more transmitting apparatuses; and
a third step for receiving the data and the known signal transmitted from the one or more transmitting apparatuses.