Active cancellation of interference in a wireless communication system
First Claim
1. A method of performing active interference cancellation in a system including multiple radios, wherein signals from a first radio are received as interference at a second radio, the method comprising:
- providing interference conditioning, which manipulates an interference reference of the interference at the first radio to approximate an interference observed at the second radio, the first radio coupled to the second radio;
tuning the interference conditioning using a least mean square (LMS) technique; and
removing the interference based on the tuning,wherein the tuning the interference conditioning using the LMS technique is performed for a block of samples from the first radio, and wherein the tuning includes adjusting a step size according to a block size.
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Abstract
Various methods and corresponding active interference cancellation units are described. These methods and units can perform active interference cancellation in a system including multiple radios. Notably, signals from a first radio can be received as interference at a second radio. The described methods and units can provide interference conditioning, which manipulates an interference reference of the interference at the first radio to approximate an interference observed at the second radio. After tuning of the interference conditioning, the interference can be removed.
104 Citations
22 Claims
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1. A method of performing active interference cancellation in a system including multiple radios, wherein signals from a first radio are received as interference at a second radio, the method comprising:
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providing interference conditioning, which manipulates an interference reference of the interference at the first radio to approximate an interference observed at the second radio, the first radio coupled to the second radio; tuning the interference conditioning using a least mean square (LMS) technique; and removing the interference based on the tuning, wherein the tuning the interference conditioning using the LMS technique is performed for a block of samples from the first radio, and wherein the tuning includes adjusting a step size according to a block size. - View Dependent Claims (2, 3)
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4. A method of performing active interference cancellation in a system including multiple radios, wherein signals from a first radio are received as interference at a second radio, the method comprising:
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providing interference conditioning, which manipulates an interference reference of the interference at the first radio to approximate an interference observed at the second radio, the first radio coupled to the second radio; tuning the interference conditioning using a least mean square (LMS) technique; and removing the interference based on the tuning, wherein the tuning the interference conditioning using the LMS technique includes determining whether a current phase is effective by observing a residual signal strength of one or more digital filters at the second radio.
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5. A method of performing active interference cancellation in a system including multiple radios, wherein signals from a first radio are received as interference at a second radio, the method comprising:
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providing interference conditioning, which manipulates an interference reference of the interference at the first radio to approximate an interference observed at the second radio, the first radio coupled to the second radio; tuning the interference conditioning using a least mean square (LMS) technique; and removing the interference based on the tuning, wherein the tuning the interference conditioning using the LMS technique includes deriving a cancellation signal strength based on two residual signal strengths and a coupling signal strength.
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6. A method of performing active interference cancellation in a system including multiple radios, wherein signals from a first radio are received as interference at a second radio, the method comprising:
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providing interference conditioning, which manipulates an interference reference of the interference at the first radio to approximate an interference observed at the second radio, the first radio coupled to the second radio; tuning the interference conditioning based on observation of a signal after interference cancellation; and removing the interference based on the tuning, wherein the tuning includes adjusting a rate at which conditioning is changed according to a block size. - View Dependent Claims (7, 8)
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9. A method of performing active interference cancellation in a system including multiple radios, wherein signals from a first radio are received as interference at a second radio, the method comprising:
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providing interference conditioning, which manipulates an interference reference of the interference at the first radio to approximate an interference observed at the second radio, the first radio coupled to the second radio; tuning the interference conditioning based on observation of a signal after interference cancellation; and removing the interference based on the tuning, wherein the tuning includes deriving a cancellation signal strength based on two residual signal strengths and a coupling signal strength.
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10. A wireless communication system, comprising:
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a first radio having a first transmission path; a second radio communicatively coupled to the first radio, the second radio having a receive path that receives signals from the first transmission path as interference, the receive path including a least mean square (LMS)adaptive filter; and an active interference cancellation (AIC) unit coupled between the first radio and the second radio that manipulates an interference reference of the interference at the first radio to approximate an interference observed at the second radio; wherein the LMS adaptive filter tunes the AIC unit for each block of samples received from the first transmission path, and wherein the AIC unit removes the interference based on tuning received from the LMS adaptive filter. - View Dependent Claims (11, 12, 13, 14, 15, 16)
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17. A wireless communication system, comprising:
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a first radio having a first transmission path; a second radio communicatively coupled to the first radio, the second radio having a receive path that receives signals from the first transmission path as interference, the receive path including tuning circuitry, the tuning circuitry generating tuning signals; and an active interference cancellation (AIC) unit coupled between the first radio and the second radio that provides interference conditioning that manipulates an interference reference of the interference at the first radio to approximate an interference observed at the second radio, the AIC unit receiving the tuning signals; wherein the tuning circuitry tunes the interference conditioning at the AIC unit based on observation of a signal after interference cancellation, wherein the AIC unit adjusts a rate at which the tuning circuitry changes the interference conditioning based on a block size, and wherein the AIC unit removes the interference based on the tuning signals. - View Dependent Claims (18, 19, 20)
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21. A wireless communication system, comprising:
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a first radio having a first transmission path; a second radio communicatively coupled to the first radio, the second radio having a receive path that receives signals from the first transmission path as interference, the receive path including tuning circuitry, the tuning circuitry generating tuning signals; and an active interference cancellation (AIC) unit coupled between the first radio and the second radio that provides interference conditioning that manipulates an interference reference of the interference at the first radio to approximate an interference observed at the second radio, the AIC unit receiving the tuning signals; wherein the tuning circuitry tunes the interference conditioning in the AIC unit based on observation of a signal after interference cancellation, wherein the AIC unit removes the interference based on the tuning signals, and wherein the tuning circuitry tunes the interference conditioning by deriving a cancellation signal strength based on two residual signal strengths and a coupling signal strength. - View Dependent Claims (22)
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Specification