1. A transmitting apparatus that allocates, to one
terminal, at least one of a plurality of transmission
layers and allocates at least one resource block that is a
minimum allocation unit of a communication resource in each
transmission layer, to transmit a signal to the terminal,
the transmitting apparatus comprising:
processing units each associated with one transmission layer of the plurality of transmission layers, the processing units being equal in number to the transmission layers,
each of the processing units comprising:
a reference signal generation unit to generate a reference signal to be used by the terminal in demodulation processing on a received signal; and
an information processing unit to determine an arrangement of the resource block in which to transmit the reference signal to the terminal, on a basis of at least one of a state of a channel between the transmitting apparatus and the terminal or information on the resource block to be used in transmission of the reference signal in an adjacent cell.
2. The transmitting apparatus according to claim 1,
wherein
the information processing unit selects an arrangement of the resource block to be used in transmission of the reference signal from among a plurality of predetermined arrangements.
3. The transmitting apparatus according to claim 2,
wherein
the plurality of predetermined arrangements include a

plurality of arrangements different in density of the resource block in a scheduling unit that is a unit in which to allocate the resource block.
4. The transmitting apparatus according to claim 3,
wherein
the plurality of arrangements different in density of the resource block are different in density in a frequency axis direction in the scheduling unit.
5. The transmitting apparatus according to claim 3, wherein the plurality of arrangements different in density of the resource block are different in density in a time axis direction in the scheduling unit.
6. The transmitting apparatus according to any one of claims 2 to 5, wherein
the plurality of predetermined arrangements include a plurality of arrangements that are equal in density of the resource block in a scheduling unit that is a unit in which to allocate the resource block and that does not coincide in position of the resource blocks in the scheduling unit.
7. The transmitting apparatus according to any one of
claims 1 to 6, wherein
the arrangement of the resource block in which to transmit the reference signal varies from terminal to terminal with which the transmitting apparatus communicates.
8. The transmitting apparatus according to any one of
claims 1 to 7, wherein
the arrangement of the resource block in which to transmit the reference signal is notified to the terminal

using information indicating a reference arrangement and offset information indicating an offset from the reference arrangement.
9. The transmitting apparatus according to any one of
claims 1 to 7, wherein
the arrangement of the resource block in which to transmit the reference signal is set on a basis of an identifier of a cell.
10. The transmitting apparatus according to any one of
claims 1 to 7, wherein
the arrangement of the resource block in which to transmit the reference signal is set on a basis of an identifier of a multicast communication.
11. A receiving apparatus that receives a signal
transmitted by the transmitting apparatus according to any
one of claims 1 to 10, wherein
the receiving apparatus identifies a resource block in which the transmitting apparatus transmits the reference signal and demodulates a data signal using the reference signal contained in the identified resource block.