Adaptive non-linear interference cancellation for intermodulation distortion

摘要

A wireless communication device including two or more aggressor transmitters and a victim receiver that is adversely affected by intermodulation distortion (IMD) components associated with the signals transmitted by the two or more aggressor transmitters. Because the aggressor transmitters and the victim receiver are located on the same device, the transmit waveforms that contribute to the IMD components are known and available. More specifically, digital baseband samples used by the aggressor transmitters to generate the transmit waveforms are available. These digital baseband samples are used to reconstruct the IMD component on the wireless device. This reconstructed (estimated) IMD component is provided to the victim receiver, and is subtracted from a signal received by the victim receiver, thereby effectively removing the IMD component present in this received signal. An adaptive filter using a Volterra series can be used to estimate the IMD component in response to the transmitter digital baseband samples.

主权项

1. A method comprising:
transmitting a first wireless signal from a first wireless transmitter of a wireless device based at least in part on a first set of digital signals; transmitting a second wireless signal from a second wireless transmitter of the wireless device based at least in part on a second set of digital signals; estimating an intermodulation distortion (IMD) component of a signal received at a first receiver of the wireless device caused by the transmissions of the first wireless signal and the second wireless signal; subtracting the estimated IMD component of the signal received at the first receiver from the signal received at the first receiver; transmitting a third wireless signal based at least in part on a third set of digital signals; estimating an IMD component of a signal received at a second receiver of the wireless device caused by the transmissions of the first wireless signal and the third wireless signal; and subtracting the estimated IMD component of the signal received at the second receiver from the signal received at the second receiver.