Methods and apparatuses for interference cancellation
First Claim
1. An apparatus, comprising:
- a main receive antenna, configured to receive a radio frequency receive signal, and transmit the radio frequency receive signal to a main-path self-interference canceller;
a divider, configured to obtain a radio frequency reference signal generated according to a transmit signal, and transmit the radio frequency reference signal to the main-path self-interference canceller and a near-field reflected self-interference canceller;
the main-path self-interference canceller, configured to receive the radio frequency reference signal transmitted by the divider and the radio frequency receive signal transmitted by the main receive antenna, and perform interference cancellation on the radio frequency receive signal according to the radio frequency reference signal to obtain a first processed signal; and
the near-field reflected self-interference canceller, configured to receive the radio frequency reference signal transmitted by the divider and the first processed signal obtained by the main-path self-interference canceller, perform near-field reflected self-interference channel estimation according to a digital baseband reference signal corresponding to the radio frequency reference signal and according to a first digital signal obtained by sampling the first processed signal to obtain a near-field reflected self-interference component parameter, perform near-field reflected self-interference signal reconstruction according to the near-field reflected self-interference component parameter and the radio frequency reference signal to generate a near-field reflected self-interference signal, and perform interference cancellation processing on the first processed signal according to the near-field reflected self-interference signal to obtain a second processed signal;
wherein the near-field reflected self-interference canceller comprises;
a first analog-to-digital converter, configured to receive the first processed signal obtained by the main-path self-interference canceller, perform digital sampling on the first processed signal to obtain the first digital signal, and transmit the first digital signal to a near-field reflected self-interference channel estimation circuit;
the near-field reflected self-interference channel estimation circuit, configured to receive the first digital signal transmitted by the first analog-to-digital converter, obtain the digital baseband reference signal corresponding to the radio frequency reference signal, perform near-field reflected self-interference channel estimation according to the first digital signal and the digital baseband reference signal to obtain the near-field reflected self-interference component parameter, and transmit the near-field reflected self-interference component parameter to a near-field reflected self-interference signal reconstruction circuit; and
the near-field reflected self-interference signal reconstruction circuit, configured to receive the near-field reflected self-interference component parameter obtained by the near-field reflected self-interference channel estimation circuit and the radio frequency reference signal transmitted by the divider, and perform near-field reflected self-interference signal reconstruction according to the near-field reflected self-interference component parameter and the radio frequency reference signal to obtain the near-field reflected self-interference signal;
wherein the near-field reflected self-interference canceller further comprises;
a second analog-to-digital converter, configured to receive the radio frequency reference signal, and perform digital sampling on the radio frequency reference signal to obtain the digital baseband reference signal.
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Accused Products
Abstract
Methods and apparatuses are provided to cancel a near-field reflected self-interference component. The method includes: obtaining a radio frequency receive signal by using a main receive antenna; performing interference cancellation processing on the radio frequency receive signal according to the radio frequency reference signal to generate a first processed signal; performing near-field reflected self-interference channel estimation according to a digital baseband reference signal corresponding to the radio frequency reference signal and according to a first digital signal obtained by sampling the first processed signal to obtain a near-field reflected self-interference component parameter; performing near-field reflected self-interference signal reconstruction according to the near-field reflected self-interference component parameter and the radio frequency reference signal to obtain a near-field reflected self-interference signal; and performing interference cancellation processing on the first processed signal according to the near-field reflected self-interference signal to obtain a second processed signal.
29 Citations
18 Claims
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1. An apparatus, comprising:
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a main receive antenna, configured to receive a radio frequency receive signal, and transmit the radio frequency receive signal to a main-path self-interference canceller; a divider, configured to obtain a radio frequency reference signal generated according to a transmit signal, and transmit the radio frequency reference signal to the main-path self-interference canceller and a near-field reflected self-interference canceller; the main-path self-interference canceller, configured to receive the radio frequency reference signal transmitted by the divider and the radio frequency receive signal transmitted by the main receive antenna, and perform interference cancellation on the radio frequency receive signal according to the radio frequency reference signal to obtain a first processed signal; and the near-field reflected self-interference canceller, configured to receive the radio frequency reference signal transmitted by the divider and the first processed signal obtained by the main-path self-interference canceller, perform near-field reflected self-interference channel estimation according to a digital baseband reference signal corresponding to the radio frequency reference signal and according to a first digital signal obtained by sampling the first processed signal to obtain a near-field reflected self-interference component parameter, perform near-field reflected self-interference signal reconstruction according to the near-field reflected self-interference component parameter and the radio frequency reference signal to generate a near-field reflected self-interference signal, and perform interference cancellation processing on the first processed signal according to the near-field reflected self-interference signal to obtain a second processed signal; wherein the near-field reflected self-interference canceller comprises; a first analog-to-digital converter, configured to receive the first processed signal obtained by the main-path self-interference canceller, perform digital sampling on the first processed signal to obtain the first digital signal, and transmit the first digital signal to a near-field reflected self-interference channel estimation circuit; the near-field reflected self-interference channel estimation circuit, configured to receive the first digital signal transmitted by the first analog-to-digital converter, obtain the digital baseband reference signal corresponding to the radio frequency reference signal, perform near-field reflected self-interference channel estimation according to the first digital signal and the digital baseband reference signal to obtain the near-field reflected self-interference component parameter, and transmit the near-field reflected self-interference component parameter to a near-field reflected self-interference signal reconstruction circuit; and the near-field reflected self-interference signal reconstruction circuit, configured to receive the near-field reflected self-interference component parameter obtained by the near-field reflected self-interference channel estimation circuit and the radio frequency reference signal transmitted by the divider, and perform near-field reflected self-interference signal reconstruction according to the near-field reflected self-interference component parameter and the radio frequency reference signal to obtain the near-field reflected self-interference signal; wherein the near-field reflected self-interference canceller further comprises; a second analog-to-digital converter, configured to receive the radio frequency reference signal, and perform digital sampling on the radio frequency reference signal to obtain the digital baseband reference signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. An interference cancellation method, comprising:
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obtaining a radio frequency reference signal generated according to a transmit signal; obtaining a radio frequency receive signal by using a main receive antenna; performing interference cancellation processing on the radio frequency receive signal according to the radio frequency reference signal to generate a first processed signal; performing near-field reflected self-interference channel estimation according to a digital baseband reference signal corresponding to the radio frequency reference signal and according to a first digital signal obtained by sampling the first processed signal to obtain a near-field reflected self-interference component parameter; performing near-field reflected self-interference signal reconstruction according to the near-field reflected self-interference component parameter and the radio frequency reference signal to obtain a near-field reflected self-interference signal; and performing interference cancellation processing on the first processed signal according to the near-field reflected self-interference signal to obtain a second processed signal; wherein before performing near-field reflected self-interference signal reconstruction according to the near-field reflected self-interference component parameter and the radio frequency reference signal to obtain a near-field reflected self-interference signal, the method further comprises;
amplifying the radio frequency reference signal, so as to perform near-field reflected self-interference signal reconstruction according to the near-field reflected self-interference component parameter and the amplified radio frequency reference signal to obtain the near-field reflected self-interference signal; andbefore performing interference cancellation processing on the first processed signal according to the near-field reflected self-interference signal to obtain a second processed signal, the method further comprises;
amplifying the first processed signal, so as to perform interference cancellation processing on the amplified first processed signal according to the near-field reflected self-interference signal to obtain the second processed signal. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17)
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18. An interference cancellation method, comprising:
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obtaining a radio frequency reference signal generated according to a transmit signal; obtaining a radio frequency receive signal by using a main receive antenna; performing interference cancellation processing on the radio frequency receive signal according to the radio frequency reference signal to generate a first processed signal; performing near-field reflected self-interference channel estimation according to a digital baseband reference signal corresponding to the radio frequency reference signal and according to a first digital signal obtained by sampling the first processed signal to obtain a near-field reflected self-interference component parameter; performing near-field reflected self-interference signal reconstruction according to the near-field reflected self-interference component parameter and the radio frequency reference signal to obtain a near-field reflected self-interference signal; and performing interference cancellation processing on the first processed signal according to the near-field reflected self-interference signal to obtain a second processed signal; wherein the near-field reflected self-interference component parameter comprises a first delay parameter, a first amplitude and phase parameter, and a second amplitude and phase parameter; and wherein performing near-field reflected self-interference signal reconstruction according to the near-field reflected self-interference component parameter and the radio frequency reference signal to obtain a near-field reflected self-interference signal comprises; performing delay processing on the radio frequency reference signal for at least one time, to form a delay signal of at least one radio frequency reference signal; selecting, from delay signals of all radio frequency reference signals, a delay signal of at least one radio frequency reference signal according to the first delay parameter; performing, according to the first amplitude and phase parameter and the second amplitude and phase parameter, amplitude and phase adjustment on the selected delay signal of the at least one radio frequency reference signal; and combining delay signals of radio frequency reference signals after amplitude and phase adjustment, to generate the near-field reflected self-interference signal.
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Specification