Methods for cancellation of radio interference in wireless communication systems
AssigneeThe Regents of the University of California
InventorsYingbo Hua, Ping Liang
Life of this patent
Estimating the term…
Abstract
A full duplex radio includes self-interference cancellation circuitry for reducing self-interference. The self-interference cancellation circuitry may receive analog radio frequency signals that are to be transmitted by an antenna, and downconvert and digitize the signals to provide a digital baseband signal for processing, for example by an adaptive filter. The filtered signal may be Cconverted to an analog signal and applied in an analog portion of a receive chain of a receiver of the full duplex radio. Preferably the analog signal is applied in the receive chain after low noise amplification of received signals of interest.
Claims18
A method of cancelling self-interference in a full duplex radio, comprising:
- converting a radio frequency (RF) analog output signal of a transmission chain of the radio to a digital baseband signal;
- digitally filtering the digital baseband signal using a digital adaptive filter;
- converting the digitally filtered signal to an analog signal;
- combining the analog signal with a received signal from another radio in an analog portion of a receive chain of the radio.
A full duplex radio, comprising:
- a transmit chain including a digital-to-analog converter (DAC), a radio frequency (RF) mixer, and a power amplifier;
- a receive chain including a low noise amplifier (LNA), an RF mixer, and an analog-to-digital converter (ADC);
- and
- self-interference cancellation circuitry including a digital adaptive filter coupled between an output of the power amplifier of the transmit chain and the receive chain.
Dependencies are inferred from the claim text.