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 in response to a first set of digital signals; transmitting a second wireless signal in response to a second set of digital signals, wherein the first wireless signal and the second wireless signal generate an intermodulation distortion (IMD) component to a receiver, whereby a received signal of the receiver includes the IMD component; generating an estimated IMD component in response to the first and second sets of digital signals; and subtracting the estimated IMD component from the received signal.