Self-calibration for implicit beamforming

A method, comprising:

• at a user equipment (UE) equipped with a first radio and a second radio, wherein the first radio is configured to perform implicit beamforming:
• selecting a calibration frequency;
• and
• performing a calibration procedure for the first radio based on, at least, the calibration frequency, the calibration procedure comprising the first radio transmitting and receiving signals and the second radio transmitting and receiving signals during the calibration procedure,
• wherein the first radio is communicatively coupled to at least two antennas, and the calibration procedure comprises:
• transmitting, by the second radio, a tone signal over the calibration frequency;
• receiving, at a first antenna of the first radio, the tone signal;
• receiving, at a second antenna of the first radio, the tone signal;
• and
• determining a relative phase of the tone signal based on, at least, the tone signal;
• received at the first antenna and at the second antenna.

One or more processors configured to perform operations comprising:

• receiving, from a first receive chain of a first radio in a device, a tone signal at a calibration frequency, wherein the tone signal was transmitted by a second radio in the device;
• receiving, from a second receive chain of the first radio, the tone signal at the calibration frequency;
• and
• determining a relative phase of the tone signal based on, at least, the tone signal received from the first receive chain and the second receive chain.