Methods of nonlinearity estimation, reporting, and compensation

A method performed by a receiver in a second device for identifying a nonlinearity profile of distortion of transmissions in a communications network by a transmitter in a first device, the method comprising:

• receiving an amplitude tracking reference signal (ATRS) from the first device, wherein the ATRS comprises information indicating a nonlinearity profile of distortions of transmissions by the transmitter;
• and
• identifying the nonlinearity profile of distortion of transmissions by the transmitter based on the ATRS.

A first device comprising a transmitter adapted to:

• generate an amplitude tracking reference signal (ATRS), wherein the ATRS comprises information indicating a nonlinearity profile of distortions of transmissions by the transmitter;
• and
• transmit the generated ATRS towards a second device.

A second device comprising a receiver adapted to:

• receive an amplitude tracking reference signal (ATRS) from a first device in a communications network, wherein the ATRS comprises information indicating a nonlinearity profile of distortions of transmissions by a transmitter of the first device;
• and
• identify the nonlinearity profile of distortion of transmissions by the transmitter based on the ATRS.