Method and apparatus for spatial modulation

A transmitting side device for sending additional information by using a transmission pattern in a wireless communication system, the device comprising:

• a RF unit connected to multiple antennas, and configured to transmit reference signals (RSs) via the multiple antennas with a specific RS transmission pattern, selected from among multiple RS transmission patterns, to a receiving side device;
• a memory storing the multiple RS transmission patterns;
• and
• a processor connected to the RF unit and the memory, and configured to control the RF unit to communicate data with the receiving side device based on the additional information,
• wherein the RSs are used by the receiving side device for one or more of channel estimation and data demodulation, and
• wherein the specific RS transmission pattern is used by the receiving side device for acquiring the additional information,

A method of sending additional information by using a transmission pattern in a wireless communication system, the method comprising:

• transmitting reference signals (RSs) via multiple antennas with a specific RS transmission pattern, selected from among multiple RS transmission patterns, to a receiving side device,
• wherein the RSs are used by the receiving side device for one or more of channel estimation and data demodulation, and
• wherein the specific RS transmission pattern is used by the receiving side device for acquiring the additional information,
• communicating data with the receiving side device based on the additional information.