ADAPTIVE INTERFERENCE CANCELLATION FOR TRANSMITTER DISTORTION CALIBRATION IN MULTI-ANTENNA TRANSMITTERS
First Claim
1. A wireless communication device configured to calibrate one transceiver chain that is transmitting a first output signal while another transceiver chain is concurrently transmitting a second output signal, comprising:
- a first transceiver chain including a first transmit circuit and a first receive circuit coupled in parallel between a core logic and a first antenna, the first transceiver chain further including a loopback path configured to route the first output signal as a loopback calibration signal from the first transmit circuit directly to the first receive circuit;
a second transceiver chain including a second transmit circuit and a second receive circuit coupled in parallel between the core logic and a second antenna, wherein the second transceiver chain transmits the second output signal via the second antenna while the first transceiver chain transmits the first output signal via the first antenna; and
an interference processor connected between the second transmit circuit and the first receive circuit, wherein the interference processor is configured to process the second output signal to generate a compensation signal that eliminates, from the loopback calibration signal, unwanted components of the second output signal received by the first antenna.
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Accused Products
Abstract
A wireless communication device includes a core logic, first and second transceiver chains, first and second antennas, and an interference processor. The core logic is coupled to both the first and second transceiver chains, which in turn are coupled to the first and second antennas, respectively. The interference processor is coupled between the first and second transceiver chains. To calibrate circuitry within the first transceiver chain using first signals generated in the first transceiver chain while the second transceiver chain is transmitting second signals via the second antenna, the interference processor connects the transmit circuit of the second transceiver chain to the receive circuitry of the first transceiver chain to form an interference feedback path that can be used to compensate for unwanted components of the second signal undesirably picked up by the first antenna.
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Citations
20 Claims
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1. A wireless communication device configured to calibrate one transceiver chain that is transmitting a first output signal while another transceiver chain is concurrently transmitting a second output signal, comprising:
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a first transceiver chain including a first transmit circuit and a first receive circuit coupled in parallel between a core logic and a first antenna, the first transceiver chain further including a loopback path configured to route the first output signal as a loopback calibration signal from the first transmit circuit directly to the first receive circuit; a second transceiver chain including a second transmit circuit and a second receive circuit coupled in parallel between the core logic and a second antenna, wherein the second transceiver chain transmits the second output signal via the second antenna while the first transceiver chain transmits the first output signal via the first antenna; and an interference processor connected between the second transmit circuit and the first receive circuit, wherein the interference processor is configured to process the second output signal to generate a compensation signal that eliminates, from the loopback calibration signal, unwanted components of the second output signal received by the first antenna. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method of calibrating one transceiver chain of a wireless communication device while another transceiver chain of the device is active, the method comprising:
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transmitting a first output signal from a first transceiver chain of the device using a first antenna while concurrently transmitting a second output signal from a second transceiver chain of the device using a second antenna; routing the first output signal as a loopback calibration signal from a transmit circuit of the first transceiver chain to a receive circuit of the first transceiver chain; processing the second output signal in an interference processor to generate a compensation signal; subtracting the compensation signal from the loopback calibration signal to generate a first calibration signal; and selectively adjusting settings of one or more components of the first transceiver chain in response to the first calibration signal. - View Dependent Claims (10, 11, 12, 13, 14)
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15. A wireless communication device configured to calibrate one transceiver chain that is transmitting a first signal while another transceiver chain is concurrently transmitting a second signal, comprising:
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means for transmitting a first output signal from a first transceiver chain of the device using a first antenna while concurrently transmitting a second output signal from a second transceiver chain of the device using a second antenna; means for routing the first output signal as a loopback calibration signal from a transmit circuit of the first transceiver chain to a receive circuit of the first transceiver chain; means for processing the second output signal in an interference processor to generate a compensation signal; means for subtracting the compensation signal from the loopback calibration signal to generate a first calibration signal; and means for selectively adjusting settings of one or more components of the first transceiver chain in response to the first calibration signal. - View Dependent Claims (16, 17, 18, 19, 20)
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Specification