Cancellation of Spurious Responses From Local Oscillator Cross-Coupling
First Claim
1. A method, in a radio transceiver configured to transmit a radio-frequency transmit signal at a transmit frequency and having two or more local oscillators operative to simultaneously generate local oscillator signals, at corresponding local oscillator frequencies, for simultaneously down-converting two or more corresponding received radio-frequency signals, the method comprising:
- identifying one or more self-interfering frequencies, based on the local oscillator frequencies and the transmit frequency;
generating a baseband cancellation signal by weighting and frequency-shifting a baseband representation of the transmit signal, based on the identified self-interfering frequencies; and
combining the baseband cancellation signal with a down-converted received signal, to obtain an interference-reduced baseband signal.
1 Assignment
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Accused Products
Abstract
Interference cancellation techniques may be implemented in a radio transceiver configured to transmit a radio-frequency transmit signal at a transmit frequency and having two or more local oscillators operative to simultaneously generate local oscillator signals, at corresponding local oscillator frequencies, for simultaneously down-converting two or more corresponding received radio-frequency signals. An example method begins with identifying one or more self-interfering frequencies, based on the local oscillator frequencies and the transmit frequency. A baseband cancellation signal is then generated by weighting and frequency-shifting a baseband representation of the transmit signal, based on the identified self-interfering frequencies. The baseband cancellation signal is then combined with a down-converted received signal, to obtain an interference-reduced baseband signal.
7 Citations
20 Claims
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1. A method, in a radio transceiver configured to transmit a radio-frequency transmit signal at a transmit frequency and having two or more local oscillators operative to simultaneously generate local oscillator signals, at corresponding local oscillator frequencies, for simultaneously down-converting two or more corresponding received radio-frequency signals, the method comprising:
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identifying one or more self-interfering frequencies, based on the local oscillator frequencies and the transmit frequency; generating a baseband cancellation signal by weighting and frequency-shifting a baseband representation of the transmit signal, based on the identified self-interfering frequencies; and combining the baseband cancellation signal with a down-converted received signal, to obtain an interference-reduced baseband signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A radio transceiver comprising:
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a transmitter circuit configured to transmit a radio-frequency transmit signal at a transmit frequency; two or more local oscillators configured to simultaneously generate local oscillator signals, at corresponding local oscillator frequencies; and a receiver circuit configured to simultaneously down-convert two or more received radio-frequency signals, using corresponding ones of the two or more local oscillators; and a baseband processing circuit configured to identify one or more self-interfering frequencies, based on the local oscillator frequencies and the transmit frequency; generate a baseband cancellation signal by weighting and frequency-shifting a baseband representation of the transmit signal; and combine the baseband cancellation signal with a down-converted received signal, to obtain an interference-reduced baseband signal. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16, 17)
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18. A wireless device comprising a radio transceiver, the radio transceiver comprising
a transmitter circuit configured to transmit a radio-frequency transmit signal at a transmit frequency; -
two or more local oscillators configured to simultaneously generate local oscillator signals, at corresponding local oscillator frequencies; and a receiver circuit configured to simultaneously down-convert two or more received radio-frequency signals, using corresponding ones of the two or more local oscillators; and a baseband processing circuit configured to identify one or more self-interfering frequencies, based on the local oscillator frequencies and the transmit frequency; generate a baseband cancellation signal by weighting and frequency-shifting a baseband representation of the transmit signal; and combine the baseband cancellation signal with a down-converted received signal, to obtain an interference-reduced baseband signal. - View Dependent Claims (19, 20)
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Specification