Interference cancellation for full-duplex communications
First Claim
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1. A communications apparatus used in a wireless full duplex system, the communications apparatus comprising:
- a receiver chain connected to a receive antenna, the receiver chain comprising;
a first baseband amplifier to amplify a receive signal in a receive path; and
a first automatic gain controller to control the first baseband amplifier; and
an interference cancelling chain,wherein one or more cancellation signals generated by the interference cancelling chain are fed back to the receiver chain prior to the first baseband amplifier which uses the first automatic gain controller; and
a transmitter chain connected to a transmit antenna,wherein the interference cancelling chain is controlled by a digital cancellation algorithm according to an input of the transmitter chain and an output of the receiver chain; and
wherein the digital cancellation algorithm adjusts a fast Fourier transform (FFT) resolution to find a position of a time domain tap delay needed for said one or more cancellation signals.
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Abstract
A communications apparatus used in a wireless full duplex system is disclosed. The communications apparatus includes a receiver chain connected to an antenna and an interference cancelling chain. One or more cancellation signals generated by the interference cancelling chain are fed back to the receiver chain prior to the first baseband amplifier which uses the first automatic gain control and the second automatic gain controller. Other methods and systems also are disclosed.
75 Citations
17 Claims
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1. A communications apparatus used in a wireless full duplex system, the communications apparatus comprising:
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a receiver chain connected to a receive antenna, the receiver chain comprising; a first baseband amplifier to amplify a receive signal in a receive path; and a first automatic gain controller to control the first baseband amplifier; and an interference cancelling chain, wherein one or more cancellation signals generated by the interference cancelling chain are fed back to the receiver chain prior to the first baseband amplifier which uses the first automatic gain controller; and a transmitter chain connected to a transmit antenna, wherein the interference cancelling chain is controlled by a digital cancellation algorithm according to an input of the transmitter chain and an output of the receiver chain; and wherein the digital cancellation algorithm adjusts a fast Fourier transform (FFT) resolution to find a position of a time domain tap delay needed for said one or more cancellation signals. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method implemented in a communications apparatus used in a wireless full duplex system, the method comprising:
in a receiver chain connected to a receive antenna, amplifying, with a first baseband amplifier, a receive signal in a receive path; and controlling, with a first automatic gain controller, the first baseband amplifier, wherein one or more cancellation signals generated by an interference cancelling chain are fed back to the receiver chain prior to the first baseband amplifier which uses the first automatic gain controller; controlling, with a received signal strength indicator (RSSI), the first automatic gain controller in the receiver chain and the second automatic gain controller in the receiver chain, wherein the interference cancelling chain further comprises; a third automatic gain controller to control the third baseband amplifier; a fourth automatic gain controller to control the fourth baseband amplifier, and wherein the RSSI controls the third automatic gain controller in the cancellation chain and the fourth automatic gain controller in the cancellation chain. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17)
Specification