Methods for cancellation of radio interference in wireless communication systems
First Claim
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1. 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.
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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 converted 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.
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Citations
15 Claims
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1. A method of cancelling self-interference in a full duplex radio, comprising:
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A full duplex radio, comprising:
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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; wherein the self-interference cancellation circuitry is coupled to a baseband portion of the receive chain.
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10. A full duplex radio, comprising:
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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; wherein the self-interference cancellation circuitry including the digital adaptive filter comprises a transversal filter.
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11. A full duplex radio, comprising:
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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; wherein the self-interference cancellation circuitry further comprises preprocessing circuitry for downconverting and digitizing the output of the power amplifier and postprocessing circuitry for converting an output of the digital adaptive filter to an analog signal. - View Dependent Claims (12, 13, 14)
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15. A full duplex radio, comprising:
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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; wherein the transmit chain includes a waveform prefilter.
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Specification