Digital pre-distortion for multi-antenna systems

A power amplifier network comprising:

• a first path comprising a first power amplifier;
• a second path comprising a second power amplifier;
• a common input path to both the first path and the second path, wherein the common input path comprises a common pre-distortion processing circuit;
• a first power control network for controlling a first signal applied to the first power amplifier;
• and
• a second power control network for controlling a second signal applied to the second power amplifier, wherein:
• the first power control network is different from the second power control network;
• the first power control network is configured to receive a control signal representative of an input power to the first power amplifier;
• the second power control network is configured to receive a control signal representative of an input power to the second power amplifier, wherein the input power to the second power amplifier is different from the input power to the first power amplifier;
• and
• the first power control network is configured to control an operating point of the first power amplifier and the second power control network is configured to control an operating point of the second power amplifier.