Non-linear interference cancellation for wireless transceivers
First Claim
1. A method for non-linear reduction of interference of a transmit signal and a received signal in a transceiver device, comprising:
- applying said transmit signal to a first non-linear system wherein the first non-linear system comprises a non-linear filter operating on the transmit signal and wherein the first non-linear system is configured to model a non-linearity of a transmit (TX) chain of the transceiver device using a first memory model;
applying said received signal to a second non-linear system wherein the second non-linear system comprises a non-linear post distortion filter operating on the received signal and the second non-linear system is configured to model an inverse of a non-linearity in a receive (RX) chain using a second memory model;
adapting first parameters of the first non-linear system using tap adaptation circuitry;
adapting second parameters of the second non-linear system using the tap adaptation circuitry; and
subtracting an output of said first non-linear system from an output of said second nonlinear system to produce an interference mitigated received signal;
wherein the first parameters and the second parameters are adapted to provide a least squares algorithm generated value for the interference mitigated received signal, and wherein the second parameters comprise an arbitrary linear gain value to prevent the interference mitigated received signal from going to zero.
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Accused Products
Abstract
Non-linear interference cancellation techniques are provided for wireless transceivers. Non-linear reduction of interference of a transmit signal on a received signal in a transceiver device, comprises applying the transmit signal to a first non-linear system; applying the received signal to a second non-linear system; and subtracting an output of the first non-linear system output from an output of second non-linear system output to produce an interference mitigated received signal. The first non-linear system and/or the second non-linear system can be implemented using one or more of a Volterra series and a Generalized Memory Polynomial Model. System parameters of the first non-linear system and/or the second non-linear system are adapted to reduce a power of the interference mitigated received signal.
65 Citations
20 Claims
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1. A method for non-linear reduction of interference of a transmit signal and a received signal in a transceiver device, comprising:
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applying said transmit signal to a first non-linear system wherein the first non-linear system comprises a non-linear filter operating on the transmit signal and wherein the first non-linear system is configured to model a non-linearity of a transmit (TX) chain of the transceiver device using a first memory model; applying said received signal to a second non-linear system wherein the second non-linear system comprises a non-linear post distortion filter operating on the received signal and the second non-linear system is configured to model an inverse of a non-linearity in a receive (RX) chain using a second memory model; adapting first parameters of the first non-linear system using tap adaptation circuitry; adapting second parameters of the second non-linear system using the tap adaptation circuitry; and subtracting an output of said first non-linear system from an output of said second nonlinear system to produce an interference mitigated received signal; wherein the first parameters and the second parameters are adapted to provide a least squares algorithm generated value for the interference mitigated received signal, and wherein the second parameters comprise an arbitrary linear gain value to prevent the interference mitigated received signal from going to zero. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A system for non-linear reduction of interference of a transmit signal and a received signal in a transceiver device, comprising:
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a memory; and at least one hardware device, coupled to the memory, operative to; apply said transmit signal to a first non-linear system wherein the first non-linear system comprises a non-linear filter operating on the transmit signal and wherein the first non-linear system is configured to model a non-linearity of a transmit (TX) chain of the transceiver device using a first memory model; apply said received signal to a second non-linear system wherein the second non-linear system comprises a non-linear post distortion filter operating on the received signal and the second non-linear system is configured to model an inverse of a non-linearity in a receive (RX) chain using a second memory model; adapting first parameters of the first non-linear system using tap adaptation circuitry; adapting second parameters of the second non-linear system using the tap adaptation circuitry; subtract an output of said first non-linear system from an output of said second non-linear system to produce an interference mitigated received signal; wherein the first parameters and the second parameters are adapted to provide a least squares algorithm generated value for the interference mitigated received signal, and wherein the second parameters comprise an arbitrary linear gain value to prevent the interference mitigated received signal from going to zero. - View Dependent Claims (11, 12, 13, 14, 15)
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16. A system for non-linear reduction of interference of a transmit signal and a received signal in a transceiver device, comprising:
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first circuitry to apply said transmit signal to a first non-linear system wherein the first nonlinear system comprises a non-linear filter operating on the transmit signal and wherein the first non-linear system is configured to model a non-linearity of a transmit (TX) chain of the transceiver device using a first memory model; second circuitry to apply said received signal to a second non-linear system wherein the second non-linear system comprises a non-linear post distortion filter operating on the received signal and the second non-linear system is configured to model an inverse of a non-linearity in a receive (RX) chain using a second memory model; fourth circuitry comprising tap adaptation circuitry to adapt first parameters of the first non-linear system and second parameters of the second non-linear system; and third circuitry to subtract an output of said first non-linear system from an output of said second non-linear system to produce an interference mitigated received signal; wherein the first parameters and the second parameters are adapted to provide a least squares algorithm generated value for the interference mitigated received signal, and wherein the second parameters comprise an arbitrary linear gain value to prevent the interference mitigated received signal from going to zero. - View Dependent Claims (17, 18, 19, 20)
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Specification