Patent ID: 8897122

Claim:
A transmission device, including a plurality of antennas, for transmitting signals in a same channel at the same time point to a plurality of reception devices, comprising: a DRS generator configured to generate DRSs (dedicated reference signals) for the respective reception devices; a nonlinear spatial multiplexer configured to generate a nonorthogonal DRS by use of a first group of DRSs including at least one of the DRSs; a transmitter configured to transmit a signal containing at least the nonorthogonal DRS; an orthogonal multiplexer configured to generate an orthogonal DRS using a second group of DRSs including at least one of the DRSs, wherein the transmitter is configured to transmit a signal containing at least one of the nonorthogoal DRSs and at least one of the orthogonal DRSs; a data signal generator configured to generate data signals for the reception devices, wherein the nonlinear spatial multiplexer is configured to perform nonlinear spatial multiplexing on the data signals, and the transmitter is configured to transmit the data signals after the nonlinear spatial multiplexing to the plurality of reception devices; and a linear filter calculator configured to calculate a linear filter and interference coefficient information according to channel state information, wherein the nonlinear spatial multiplexer comprises: an interference calculator configured to calculate interference that each of the reception devices undergoes by use of the data signal or some of the DRSs of the first group, an interference subtractor configured to subtract the interference from each of the data signals for each of the reception devices or from the DRSs of the first group, and a Modulo operation part configured to carry out a Modulo operation on at least one of the data signals after the subtraction of the interference by the interference subtractor or at least one of the DRSs of the first group after the subtraction of the interference by the interference subtractor.