System and Method for Reducing In-Band Interference for a Shared Antenna

A method for suppressing interference, comprising:

• obtaining first samples of first signals transmitted by a first transmitter of a first communication device, the first signals comprising a frequency within a first frequency band, the first signals being obtained from a transmit signal path between the transmitter and an antenna;
• generating a first interference compensation signal in response to adjusting at least one of amplitude, phase, and delay of the first samples based on an in-phase variable and a quadrature parameter;
• applying the first interference compensation signal to a receive signal path of a first receiver of a second communication device, the first receiver operable to receive signals comprising a frequency within a second frequency band via the antenna, the second frequency band being adjacent or overlapping the first frequency band;
• and
• in response to the first interference compensation signal being applied to the receive signal path of the first receiver, suppressing interference imposed on the first receiver by the signals transmitted by the first transmitter.

A communication system, comprising:

• a first communication device comprising:
• a first transmitter for transmitting signals comprising a frequency within a first frequency band via a first antenna;
• a second transmitter for transmitting signals comprising a frequency within the first frequency band via a second antenna;
• a second communication device comprising a first receiver for receiving signals comprising a frequency within a second frequency band via the first antenna, the second frequency band being adjacent or overlapping the first frequency band;
• a first input for obtaining first samples of the signals transmitted by the first transmitter;
• a first output for coupling a first interference compensation signal to a receive path of the first receiver;
• a first interference compensation device, disposed between the first input and the first output, that adjusts at least one of amplitude, phase, and delay of the first samples to generate the first interference compensation signal based on an in-phase setting and a quadrature setting, the first interference compensation signal operable to suppress interference imposed on the first receiver by the signals transmitted by the first transmitter in response to being coupled to the receive path of the first receiver;
• and
• a controller for executing one or more algorithms using a feedback value received from the first receiver to determine the in-phase setting and the quadrature setting.

An isolation device for improving isolation between a first communication module and a second communication module that share an antenna, comprising:

• a first input for obtaining first samples of first signals generated by the first communication module for transmission by the antenna;
• a first output for coupling a first interference compensation signal to a receive path of the second communication module that receives second signals via the antenna;
• and
• a first interference compensation circuit, disposed between the first input and the first output, that adjusts at least one of amplitude, phase, and delay of the first samples based on an in-phase parameter and a quadrature parameter to generate the first interference compensation signal, the first interference compensation signal operable to suppress interference imposed on the second communication module by the signals transmitted by the first communication module in response to being coupled to the receive path of the second communication module.

A method for improving isolation between a first communication module and a second communication module that share an antenna, comprising:

• obtaining a first portion of a first signal generated by the first communication module for transmission by the antenna;
• and
• generating a first interference compensation signal by adjusting at least one of amplitude, phase, and delay of the first portion based on a first in-phase parameter and a first quadrature parameter;
• and
• sending the first interference compensation signal towards a receive path of the second communication module,
• wherein the first interference compensation signal is operable to suppress interference imposed on the second communication module by signals transmitted by the first communication module in response to being coupled to the receive path of the second communication module.