Interference cancellation apparatus and method
First Claim
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1. An interference cancellation apparatus, comprising:
- a main receive antenna, configured to receive a radio frequency signal, and transmit the received radio frequency signal to a first-type interference canceller;
a divider, configured to acquire a radio frequency reference signal generated according to a transmit signal, and transmit the radio frequency reference signal to the first-type interference canceller and a second-type interference reconstructor;
the first-type interference canceller, configured to receive the radio frequency reference signal transmitted by the divider and the received radio frequency signal transmitted by the main receive antenna, and cancel a first-type self-interference component in the received radio frequency signal according to the radio frequency reference signal to acquire a first processed signal, wherein the first-type self-interference component comprises a main-path self-interference component;
a local-frequency signal generator, configured to acquire a self-interference channel parameter acquired by the second-type interference reconstructor, and generate a first local-frequency signal and a second local-frequency signal according to the self-interference channel parameter;
a down converter, configured to receive the first local-frequency signal generated by the local-frequency signal generator and the first processed signal acquired by the first-type interference canceller, and perform frequency mixing processing on the first local-frequency signal and the first processed signal to acquire a second processed signal;
a filter, configured to receive the second processed signal, and perform filtering processing on the second processed signal to acquire a third processed signal;
the second-type interference reconstructor, configured to acquire the second local-frequency signal generated by the local-frequency signal generator and the radio frequency reference signal acquired by the divider, and reconstruct the self-interference signal according to the self-interference channel parameter, the radio frequency reference signal, and the second local-frequency signal;
a coupler, configured to receive the third processed signal acquired by the filter and the reconstructed self-interference signal transmitted by the second-type interference reconstructor, and cancel a second-type self-interference signal in the third processed signal according to the reconstructed self-interference signal to generate a fourth processed signal; and
a digital down-conversion unit, configured to receive the fourth processed signal, convert the fourth processed signal into a digital signal, and perform digital down-conversion processing on the digital signal to acquire a fifth processed signal;
whereinthe second-type interference reconstructor is further configured to acquire a digital baseband reference signal, receive the fifth processed signal transmitted by the digital down-conversion unit, and perform self-interference channel estimation according to the fifth processed signal and the digital baseband reference signal to acquire the self-interference channel parameter.
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Abstract
Embodiments of the present invention relate to the field of communications technologies, and provide an interference cancellation apparatus and method, which can avoid being limited by a dynamic range of an ADC/DAC and can cancel a second-type self-interference component effectively. The interference cancellation apparatus includes a main receive antenna, a divider, a first-type interference canceller, a down converter, a filter, a coupler, a digital down-conversion unit, a second-type interference reconstructor, and a local-frequency signal generator. The present invention is used for interference cancellation.
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Citations
20 Claims
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1. An interference cancellation apparatus, comprising:
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a main receive antenna, configured to receive a radio frequency signal, and transmit the received radio frequency signal to a first-type interference canceller; a divider, configured to acquire a radio frequency reference signal generated according to a transmit signal, and transmit the radio frequency reference signal to the first-type interference canceller and a second-type interference reconstructor; the first-type interference canceller, configured to receive the radio frequency reference signal transmitted by the divider and the received radio frequency signal transmitted by the main receive antenna, and cancel a first-type self-interference component in the received radio frequency signal according to the radio frequency reference signal to acquire a first processed signal, wherein the first-type self-interference component comprises a main-path self-interference component; a local-frequency signal generator, configured to acquire a self-interference channel parameter acquired by the second-type interference reconstructor, and generate a first local-frequency signal and a second local-frequency signal according to the self-interference channel parameter; a down converter, configured to receive the first local-frequency signal generated by the local-frequency signal generator and the first processed signal acquired by the first-type interference canceller, and perform frequency mixing processing on the first local-frequency signal and the first processed signal to acquire a second processed signal; a filter, configured to receive the second processed signal, and perform filtering processing on the second processed signal to acquire a third processed signal; the second-type interference reconstructor, configured to acquire the second local-frequency signal generated by the local-frequency signal generator and the radio frequency reference signal acquired by the divider, and reconstruct the self-interference signal according to the self-interference channel parameter, the radio frequency reference signal, and the second local-frequency signal; a coupler, configured to receive the third processed signal acquired by the filter and the reconstructed self-interference signal transmitted by the second-type interference reconstructor, and cancel a second-type self-interference signal in the third processed signal according to the reconstructed self-interference signal to generate a fourth processed signal; and a digital down-conversion unit, configured to receive the fourth processed signal, convert the fourth processed signal into a digital signal, and perform digital down-conversion processing on the digital signal to acquire a fifth processed signal;
whereinthe second-type interference reconstructor is further configured to acquire a digital baseband reference signal, receive the fifth processed signal transmitted by the digital down-conversion unit, and perform self-interference channel estimation according to the fifth processed signal and the digital baseband reference signal to acquire the self-interference channel parameter. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. An interference cancellation method, comprising:
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acquiring a radio frequency reference signal generated according to a transmit signal; receiving a radio frequency signal by using a main receive antenna; canceling a first-type self-interference component in the received radio frequency signal according to the radio frequency reference signal, to generate a first processed signal, wherein the first-type self-interference component comprises a main-path self-interference component; generating a first local-frequency signal and a second local-frequency signal according to a self-interference channel parameter; performing frequency mixing processing on the first local-frequency signal and the first processed signal to acquire a second processed signal; performing filtering processing on the second processed signal to acquire a third processed signal; acquiring a reconstructed self-interference signal according to the self-interference channel parameter, the radio frequency reference signal, and the second local-frequency signal; canceling a second-type self-interference signal in the third processed signal according to the reconstructed self-interference signal to generate a fourth processed signal; converting the fourth processed signal into a digital signal, and performing digital down-conversion processing on the digital signal to acquire a fifth processed signal; and performing self-interference channel estimation according to the fifth processed signal and a digital baseband reference signal to acquire the self-interference channel parameter. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20)
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Specification