INTERFERENCE CANCELLATION APPARATUS AND METHOD
First Claim
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1. An interference cancellation apparatus, comprising:
- a main receive antenna (110), configured to receive a radio frequency signal, and transmit the received radio frequency signal to a first-type interference canceller (130);
a divider (120), 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 (130) and a second-type interference reconstructor (180);
the first-type interference canceller (130), configured to receive the radio frequency reference signal transmitted by the divider (120) and the received radio frequency signal transmitted by the main receive antenna (110), 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 (190), configured to acquire a self-interference channel parameter acquired by the second-type interference reconstructor (180), and generate a first local-frequency signal and a second local-frequency signal according to the self-interference channel parameter;
a down converter (140), configured to receive the first local-frequency signal generated by the local-frequency signal generator (190) and the first processed signal acquired by the first-type interference canceller (130), and perform frequency mixing processing on the first local-frequency signal and the first processed signal to acquire a second processed signal;
a filter (150), 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 (180), configured to acquire the second local-frequency signal generated by the local-frequency signal generator (190) and the radio frequency reference signal acquired by the divider (120), 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 (160), configured to receive the third processed signal acquired by the filter (150) and the reconstructed self-interference signal transmitted by the second-type interference reconstructor (180), 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 (170), 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 (180) is further configured to acquire a digital baseband reference signal, receive the fifth processed signal transmitted by the digital down-conversion unit (170), 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.
42 Citations
20 Claims
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1. An interference cancellation apparatus, comprising:
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a main receive antenna (110), configured to receive a radio frequency signal, and transmit the received radio frequency signal to a first-type interference canceller (130); a divider (120), 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 (130) and a second-type interference reconstructor (180); the first-type interference canceller (130), configured to receive the radio frequency reference signal transmitted by the divider (120) and the received radio frequency signal transmitted by the main receive antenna (110), 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 (190), configured to acquire a self-interference channel parameter acquired by the second-type interference reconstructor (180), and generate a first local-frequency signal and a second local-frequency signal according to the self-interference channel parameter; a down converter (140), configured to receive the first local-frequency signal generated by the local-frequency signal generator (190) and the first processed signal acquired by the first-type interference canceller (130), and perform frequency mixing processing on the first local-frequency signal and the first processed signal to acquire a second processed signal; a filter (150), 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 (180), configured to acquire the second local-frequency signal generated by the local-frequency signal generator (190) and the radio frequency reference signal acquired by the divider (120), 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 (160), configured to receive the third processed signal acquired by the filter (150) and the reconstructed self-interference signal transmitted by the second-type interference reconstructor (180), 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 (170), 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 (180) is further configured to acquire a digital baseband reference signal, receive the fifth processed signal transmitted by the digital down-conversion unit (170), 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 the 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