Allocation-Based Distortion Function Selection

A radio transmitter circuit for transmitting signals within an uplink or sidelink frequency band of a cellular communications system, the radio transmitter circuit comprising:

• a signal-generation circuit configured to generate a transmission signal to be transmitted;
• and
• a radio front-end circuit, connected to the signal-generation circuit at an input of the radio front-end circuit, for receiving the transmission signal, and configured to be connected to an antenna at an output of the radio front-end circuit and to transmit the transmission signal to a remote node via said antenna;
• wherein the signal-generation circuit is configured to
• select a distortion function based on a location of an allocated radio frequency resource, within said uplink or sidelink frequency band, for the transmission signal,
• generate an intermediate transmission signal, based on information to be transmitted in the transmission signal, and
• generate the transmission signal by applying the distortion function to the intermediate transmission signal.

A method of operating a radio transmitter circuit for transmitting signals within an uplink or sidelink frequency band of a cellular communications system, the method comprising:

• selecting a distortion function based on a location of an allocated radio frequency resource, within said uplink or sidelink frequency band, for a transmission signal to be transmitted;
• generating an intermediate transmission signal, based on information to be transmitted in the transmission signal;
• generating the transmission signal by applying the distortion function to the intermediate transmission signal;
• and
• transmitting the transmission signal to a remote node via an antenna.