Method and tuner controller for closed-loop antenna tuning based on calibration data and relative transducer gain maximization

A tuner controller for performing closed-loop antenna tuning, the tuner controller comprising:

• a processor;
• and
• a memory coupled to the processor and storing calibration data;
• wherein the processor is configured to:
• initialize a tuner codeword with an initial codeword;
• set a tuner based on the tuner codeword;
• acquire a forward signal and a reverse signal associated with a radio frequency front-end;
• calculate a feedback-receiver reflection value based on the forward signal and the reverse signal;
• estimate an antenna reflection value by applying the feedback-receiver reflection value and the calibration data to an estimation function, wherein the calibration data comprises S-parameters of the radio frequency front-end and S-parameters of the tuner corresponding to tuner codewords;
• sweep a plurality of candidate codewords to evaluate a relative transducer gain for each of the plurality of candidate codewords based on the estimated antenna reflection value and the calibration data;
• select a best codeword from the plurality of candidate codewords by maximizing the relative transducer gain;
• and
• update the tuner codeword based on the best codeword.