METHODS FOR CANCELLATION OF RADIO INTERFERENCE IN WIRELESS COMMUNICATION SYSTEMS
First Claim
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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Accused Products
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.
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Citations
18 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. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16, 17, 18)
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Specification