Transmit (TX) interference canceller and power detector
First Claim
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1. A method for Tx interference cancellation and power detection in a wireless device, the method comprising:
- down-converting a portion of a Tx output signal to generate a feedback signal;
generating a reconstructed interference signal and a weight based on the feedback signal;
phase shifting the reconstructed interference signal based on the weight to produce an aligned reconstructed interference signal;
detecting a Tx power level based on the weight; and
subtracting the aligned reconstructed interference signal from a filtered baseband TX signal,wherein the feedback signal comprises a first baseband feedback signal and a second baseband feedback signal, and wherein generating the reconstructed interference signal and the weight based on the feedback signal comprises;
receiving the first baseband feedback signal and the second baseband feedback signal in a first portion of a least mean-square cancellers and receiving a filtered baseband Tx Q signal and a filtered baseband Tx I signal in the first portion of the least mean-square cancellers, wherein the first portion of the least mean-square cancellers produces said weight comprising a first weight and a second weight;
receiving the first weight and the second weight in a second portion of the least mean-square cancellers and receiving the filtered baseband Tx Q signal and the filtered baseband Tx I signal in the second portion of the least mean-square cancellers, wherein the second portion of the least mean-square cancellers produces a first desired Tx signal and a second desired Tx signal; and
subtracting the first desired Tx signal from the first baseband feedback signal and subtracting the second desired Tx signal from the second baseband feedback signal to produce said reconstructed interference signal.
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Abstract
A method for Tx interference cancellation and power detection in a wireless device is described. A portion of a Tx output signal is down-converted to generate a feedback signal. A reconstructed interference signal and a weight are generated based on the feedback signal. A Tx power level is detected based on the weight. The reconstructed interference signal is subtracted from the Tx output signal.
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Citations
47 Claims
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1. A method for Tx interference cancellation and power detection in a wireless device, the method comprising:
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down-converting a portion of a Tx output signal to generate a feedback signal; generating a reconstructed interference signal and a weight based on the feedback signal; phase shifting the reconstructed interference signal based on the weight to produce an aligned reconstructed interference signal; detecting a Tx power level based on the weight; and subtracting the aligned reconstructed interference signal from a filtered baseband TX signal, wherein the feedback signal comprises a first baseband feedback signal and a second baseband feedback signal, and wherein generating the reconstructed interference signal and the weight based on the feedback signal comprises; receiving the first baseband feedback signal and the second baseband feedback signal in a first portion of a least mean-square cancellers and receiving a filtered baseband Tx Q signal and a filtered baseband Tx I signal in the first portion of the least mean-square cancellers, wherein the first portion of the least mean-square cancellers produces said weight comprising a first weight and a second weight; receiving the first weight and the second weight in a second portion of the least mean-square cancellers and receiving the filtered baseband Tx Q signal and the filtered baseband Tx I signal in the second portion of the least mean-square cancellers, wherein the second portion of the least mean-square cancellers produces a first desired Tx signal and a second desired Tx signal; and subtracting the first desired Tx signal from the first baseband feedback signal and subtracting the second desired Tx signal from the second baseband feedback signal to produce said reconstructed interference signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. An apparatus for Tx interference cancellation and power detection, the apparatus comprising:
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a feedforward path configured to generate a Tx output signal from a filtered baseband Tx signal; and a feedback loop comprising; a Tx interference canceller/power detector that generates a reconstructed interference signal and a weight from a feedback signal, that generates an aligned reconstructed interference signal based on the weight, and that detects a Tx power level based on the weight; and a summer that subtracts the aligned reconstructed interference signal from the filtered baseband Tx signal, wherein the feedback signal comprises a first baseband feedback signal and a second baseband feedback signal, and wherein Tx interference canceller/power detector; receives the first baseband feedback signal and the second baseband feedback signal in a first portion of a least mean-square cancellers and receives a filtered baseband Tx Q signal and a filtered baseband Tx I signal in the first portion of the least mean-square cancellers, wherein the first portion of the least mean-square cancellers produces said weight comprising a first weight and a second weight; receives the first weight and the second weight in a second portion of the least mean-square cancellers and receives the filtered baseband Tx Q signal and the filtered baseband Tx I signal in the second portion of the least mean-square cancellers, wherein the second portion of the least mean-square cancellers produces a first desired Tx signal and a second desired Tx signal; and subtracts the first desired Tx signal from the first baseband feedback signal and subtracts the second desired Tx signal from the second baseband feedback signal to produce said reconstructed interference signal. - View Dependent Claims (17, 18, 19, 20, 21, 22, 23, 24, 25)
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26. A computer-program product for Tx interference cancellation and power detection in a wireless device, the computer-program product comprising a non-transitory computer-readable medium having instructions thereon, the instructions comprising:
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code for causing the wireless device to down-convert a portion of a Tx output signal to generate a feedback signal; code for causing the wireless device to generate a reconstructed interference signal and a weight based on the feedback signal; code for causing the wireless device to phase shift the reconstructed interference signal based on the weight to produce an aligned reconstructed interference signal; code for causing the wireless device to detect a Tx power level based on the weight; and code for causing the wireless device to subtract the aligned reconstructed interference signal from a filtered baseband TX signal, wherein the feedback signal comprises a first baseband feedback signal and a second baseband feedback signal, and further comprising code for causing the wireless device to; receive the first baseband feedback signal and the second baseband feedback signal in a first portion of a least mean-square cancellers and receive a filtered baseband Tx Q signal and a filtered baseband Tx I signal in the first portion of the least mean-square cancellers, wherein the first portion of the least mean-square cancellers produces said weight comprising a first weight and a second weight; receive the first weight and the second weight in a second portion of the least mean-square cancellers and receive the filtered baseband Tx Q signal and the filtered baseband Tx I signal in the second portion of the least mean-square cancellers, wherein the second portion of the least mean-square cancellers produces a first desired Tx signal and a second desired Tx signal; and subtract the first desired Tx signal from the first baseband feedback signal and subtracting the second desired Tx signal from the second baseband feedback signal to produce said reconstructed interference signal. - View Dependent Claims (27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38)
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39. A wireless device for Tx interference cancellation and power detection, comprising:
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means for down-converting a portion of a Tx output signal to generate a feedback signal; means for generating a reconstructed interference signal and a weight based on the feedback signal; means for phase shifting the reconstructed interference signal based on the weight to produce an aligned reconstructed interference signal; means for detecting a Tx power level based on the weight; and means for subtracting the aligned reconstructed interference signal from a filtered baseband TX signal, wherein the feedback signal comprises a first baseband feedback signal and a second baseband feedback signal, and further comprising; means for receiving the first baseband feedback signal and the second baseband feedback signal in a first portion of a least mean-square cancellers and receiving a filtered baseband Tx Q signal and a filtered baseband Tx I signal in the first portion of the least mean-square cancellers, wherein the first portion of the least mean-square cancellers produces said weight comprising a first weight and a second weight; means for receiving the first weight and the second weight in a second portion of the least mean-square cancellers and receiving the filtered baseband Tx Q signal and the filtered baseband Tx I signal in the second portion of the least mean-square cancellers, wherein the second portion of the least mean-square cancellers produces a first desired Tx signal and a second desired Tx signal; and means for subtracting the first desired Tx signal from the first baseband feedback signal and subtracting the second desired Tx signal from the second baseband feedback signal to produce said reconstructed interference signal. - View Dependent Claims (40, 41, 42, 43, 44, 45, 46, 47)
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Specification