Patent ID: 11895044
Assignee: MITSUBISHI ELECTRIC CORPORATION
Field: Digital communication (Electrical engineering)
Classification: CPC H | IPC H

Claim 0:
1. A transmission device comprising:
processing circuitry; and
a memory storing instructions causing the processing circuitry
to allocate one or more layers per terminal for transmission to a plurality of the terminals, and configure positions in a frequency domain and a time domain of reference signals of each of the layers on the basis of information on spatial correlation among the plurality of the terminals, and information indicating condition of each of channel between the transmission device and each of the plurality of the terminals;
to arrange the reference signals of each of the layers in the frequency domain and the time domain on the basis of the positions in the frequency domain and the time domain configured; and
to perform space-division multiplexing on signals of one or more layers arranged, and transmit the multiplexed signals, wherein
a schedule unit, which is a unit for allocation of resources in the frequency domain and the time domain, is constituted by a matrix of twelve subcarriers from zeroth to eleventh subcarriers and fourteen symbols from zeroth to thirteenth symbols,
with respect to a first plurality of layers, the reference signals that are arranged to second and third symbols of each of zeroth and first subcarriers and to the second and the third symbols of each of sixth and seventh subcarriers, are multiplied by orthogonal codes that are orthogonal to one another among the first plurality of layers, and
with respect to a second plurality of layers which is different from the first plurality of layers, the reference signals that are arranged to the second and the third symbols of each of second and third subcarriers and to the second and the third symbols of each of eighth and ninth subcarriers, are multiplied by orthogonal codes that are orthogonal to one another among the second plurality of layers.