Integrated circuits, communication units and methods of cancellation of intermodulation distortion
First Claim
1. A wireless communication unit comprising:
- a transmitter arranged to process a baseband transmit signal to produce a first radio frequency signal for wireless transmission;
a receiver arranged to receive a second radio frequency signal and convert the second radio frequency signal to a baseband receive signal wherein the receiver comprises a summation module arranged to add a cancellation signal to the baseband receive signal;
a selectivity element that is arranged to couple the transmitter and the receiver to an antenna, where a reduced portion of the first radio frequency signal is introduced into the second radio frequency signal thereby creating a second order inter-modulation distortion component in the baseband receive signal; and
an adaptive estimator module comprising a filter arranged to filter the baseband receive signal to remove dc offsets associated with the second order inter-modulation distortion component and generate the cancellation signal based on the baseband transmit signal and the filtered baseband receive signal for inputting to the summation module.
1 Assignment
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Accused Products
Abstract
A wireless communication unit includes a transmitter for processing a baseband transmit signal to produce a first radio frequency signal. A receiver is arranged to convert a second radio frequency signal to a baseband receive signal, where the receiver has a summation module arranged to add a cancellation signal to the baseband receive signal. A selectivity element is arranged to couple the transmitter and the receiver to an antenna, where a reduced portion of the first radio frequency signal is introduced into the second radio frequency signal thereby creating a second order inter-modulation distortion component in the baseband receive signal. An adaptive estimator module has a filter for filtering the baseband receive signal to remove dc offsets associated with the second order inter-modulation distortion component and generate the cancellation signal based on the baseband transmit signal and the filtered baseband receive signal for inputting to the summation module.
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Citations
20 Claims
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1. A wireless communication unit comprising:
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a transmitter arranged to process a baseband transmit signal to produce a first radio frequency signal for wireless transmission; a receiver arranged to receive a second radio frequency signal and convert the second radio frequency signal to a baseband receive signal wherein the receiver comprises a summation module arranged to add a cancellation signal to the baseband receive signal; a selectivity element that is arranged to couple the transmitter and the receiver to an antenna, where a reduced portion of the first radio frequency signal is introduced into the second radio frequency signal thereby creating a second order inter-modulation distortion component in the baseband receive signal; and an adaptive estimator module comprising a filter arranged to filter the baseband receive signal to remove dc offsets associated with the second order inter-modulation distortion component and generate the cancellation signal based on the baseband transmit signal and the filtered baseband receive signal for inputting to the summation module. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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18. An integrated circuit for a wireless communication unit comprising:
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a transmitter arranged to process a baseband transmit signal to produce a first radio frequency signal for wireless transmission; a receiver arranged to receive a second radio frequency signal and convert the second radio frequency signal to a baseband receive signal wherein the receiver comprises a summation module arranged to add a cancellation signal to the baseband receive signal; a selectivity element that is arranged to couple the transmitter and the receiver to an antenna, where a reduced portion of the first radio frequency signal is introduced into the second radio frequency signal thereby creating a second order inter-modulation distortion component in the baseband receive signal; and an adaptive estimator module comprising a filter arranged to filter the baseband receive signal to remove dc offsets associated with the second order inter-modulation distortion component and generate the cancellation signal based on the baseband transmit signal and the filtered baseband receive signal for inputting to the summation module.
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19. A method for reducing a second order inter-modulation distortion component in a wireless communication unit, the method comprising:
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processing a baseband transmit signal to produce a first radio frequency signal capable of wireless transmission; receiving a second radio frequency signal comprising a portion of the first radio frequency signal that creates a second order inter-modulation distortion component in the baseband receive signal; converting the second radio frequency signal to a baseband receive signal; adding a cancellation signal to the baseband receive signal; filtering the baseband receive signal to remove dc offsets associated with the second order inter-modulation distortion component; and generating the cancellation signal based on the baseband transmit signal and the filtered baseband receive signal.
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20. A computer program product comprising executable program code for reducing a second order inter-modulation distortion component in a wireless communication unit, the executable program code operable for:
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processing a baseband transmit signal to produce a first radio frequency signal capable of wireless transmission; receiving a second radio frequency signal comprising a portion of the first radio frequency signal that creates a second order inter-modulation distortion component in the baseband receive signal; converting the second radio frequency signal to a baseband receive signal; adding a cancellation signal to the baseband receive signal; filtering the baseband receive signal to remove dc offsets associated with the second order inter-modulation distortion component; and generating the cancellation signal based on the baseband transmit signal and the filtered baseband receive signal.
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Specification