Methods and apparatus for canceling distortion in full-duplex transceivers
First Claim
1. A communication system to reduce distortion in a full-duplex transceiver, comprising:
- a full-duplex transceiver configured to generate a first analog signal based on a first digital signal for transmission over a full-duplex channel, receive a second analog signal via the full-duplex channel, generate a second digital signal based on the second analog signal, wherein the second digital signal includes coupling distortion based on the first analog signal; and
an adaptive filter configured to generate an adaptive filter signal based on the first digital signal, and to reduce the coupling distortion from the second digital signal by subtracting the adaptive filter signal from the second digital signal;
wherein the adaptive filter reduces distortion by generating a third digital signal by subtracting the adaptive filter signal from the second digital signal.
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Abstract
Methods and apparatus for canceling distortion in full-duplex transceivers are disclosed. Some example methods to reduce distortion in a full-duplex transceiver include generating a first digital signal, generating a first analog signal based on the first digital signal for transmission over a full-duplex channel, receiving a second analog signal via the full-duplex channel, and generating a second digital signal based on the second analog signal, wherein the second digital signal includes coupling distortion based on the first analog signal. The example methods further include generating an adaptive filter signal based on the first digital signal, and reducing the coupling distortion from the second digital signal by subtracting the adaptive filter signal from the second digital signal.
24 Citations
18 Claims
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1. A communication system to reduce distortion in a full-duplex transceiver, comprising:
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a full-duplex transceiver configured to generate a first analog signal based on a first digital signal for transmission over a full-duplex channel, receive a second analog signal via the full-duplex channel, generate a second digital signal based on the second analog signal, wherein the second digital signal includes coupling distortion based on the first analog signal; and an adaptive filter configured to generate an adaptive filter signal based on the first digital signal, and to reduce the coupling distortion from the second digital signal by subtracting the adaptive filter signal from the second digital signal; wherein the adaptive filter reduces distortion by generating a third digital signal by subtracting the adaptive filter signal from the second digital signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method to reduce distortion in a full-duplex transceiver, comprising:
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generating a first digital signal; generating a first analog signal based on the first digital signal for transmission over a full-duplex channel; receiving a second analog signal via the full-duplex channel; generating a second digital signal based on the second analog signal, wherein the second digital signal includes coupling distortion based on the first analog signal; generating an adaptive filter signal based on the first digital signal; and reducing the coupling distortion from the second digital signal by subtracting the adaptive filter signal from the second digital signal; wherein reducing the coupling distortion comprises generating a third digital signal by subtracting the adaptive filter signal from the second digital signal. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16, 17)
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18. An adaptive filter to reduce distortion in a full-duplex transceiver, comprising:
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a full-duplex transceiver, configured to; receive a first digital baseband signal and generate a first analog signal based on the first digital baseband signal; transmit the first analog signal over a full-duplex channel via a duplexer and an antenna; receive a second analog signal on the antenna via the duplexer, wherein the second analog signal includes coupling distortion based on the first analog signal; output a second digital baseband signal based on the second analog signal, wherein the second digital baseband signal includes a digital representation of the coupling distortion; and an adaptive filter, configured to; generate a first-order intermodulation distortion product or a second-order intermodulation distortion product based on the first digital baseband signal; update a least-means-squared filter based on a third digital baseband signal and one of the first-order intermodulation product or the second-order intermodulation product, wherein the third digital baseband signal is received before the second digital baseband signal; generating an adaptive filter product based on the first digital baseband signal and the least-means-squared filter; and reducing the coupling distortion in the second digital baseband signal by subtracting the adaptive filter product from the second digital baseband signal.
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Specification