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 quadrature 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 quadrature baseband receive signal, wherein the receiver comprises at least one summation module arranged to add a cancellation signal to the quadrature baseband receive signal;
a selectivity element that is arranged to couple the transmitter and the receiver to an antenna, such that 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
a baseband processing module arranged to;
receive the quadrature baseband transmit signal and quadrature baseband receive signal;
apply independent gain and phase adjustments to quadrature portions of the quadrature baseband transmit signal, based on at least one signal component of the quadrature baseband receive signal, to form independent cancellation signals; and
apply the independent cancellation signals to the at least one summation module.
1 Assignment
0 Petitions
Accused Products
Abstract
A wireless communication unit includes a transmitter, a receiver, a selectivity element and a baseband processing module. The receiver has at least one summation module arranged to add a cancellation signal to the quadrature baseband receive signal. a baseband processing module arranged to: receive the quadrature baseband transmit signal and quadrature baseband receive signal; apply independent gain and phase adjustments to quadrature portions of the quadrature baseband transmit signal, based on at least one signal component of the quadrature baseband receive signal, to form independent cancellation signals; and apply the independent cancellation signals to the at least one summation module.
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Citations
19 Claims
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1. A wireless communication unit comprising:
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a transmitter arranged to process a quadrature 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 quadrature baseband receive signal, wherein the receiver comprises at least one summation module arranged to add a cancellation signal to the quadrature baseband receive signal; a selectivity element that is arranged to couple the transmitter and the receiver to an antenna, such that 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 a baseband processing module arranged to; receive the quadrature baseband transmit signal and quadrature baseband receive signal; apply independent gain and phase adjustments to quadrature portions of the quadrature baseband transmit signal, based on at least one signal component of the quadrature baseband receive signal, to form independent cancellation signals; and apply the independent cancellation signals to the at least one summation module. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. An integrated circuit for a wireless communication unit comprising:
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a transmitter arranged to process a quadrature baseband transmit signal to produce a first radio frequency signal for wireless transmission, a receiver arranged to receive a second radio frequency signal comprising a reduced portion of the first radio frequency signal and convert the second radio frequency signal to a quadrature baseband receive signal, wherein the receiver comprises at least one summation module arranged to add a cancellation signal to the quadrature baseband receive signal, and wherein the reduced portion of the first radio frequency signal creates a second order inter-modulation distortion component in the baseband receive signal; and a baseband processing module arranged to; receive the quadrature baseband transmit signal and quadrature baseband receive signal; apply independent gain and phase adjustment to quadrature portions of the quadrature baseband transmit signal, based on at least one signal component of the quadrature baseband receive signal, to form independent cancellation signals; and apply the independent cancellation signals to the at least one summation module. - View Dependent Claims (13, 14)
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15. 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 quadrature baseband transmit signal to produce a first radio frequency signal for wireless transmission; receiving a second radio frequency signal comprising a reduced 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 quadrature baseband receive signal; applying independent gain and phase adjustments to quadrature portions of the quadrature baseband transmit signal, based on at least one signal component of the quadrature baseband receive signal, to form independent cancellation signals; and adding the independent cancellation signals to the quadrature baseband receive signal to reduce the second order inter-modulation distortion component. - View Dependent Claims (16)
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17. 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 quadrature baseband transmit signal to produce a first radio frequency signal for wireless transmission; receiving a second radio frequency signal comprising a reduced 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 quadrature baseband receive signal; applying independent gain and phase adjustments to quadrature portions of the quadrature baseband transmit signal, based on at least one signal component of the quadrature baseband receive signal, to form independent cancellation signals; and adding the independent cancellation signals to the quadrature baseband receive signal to reduce the second order inter-modulation distortion component. - View Dependent Claims (18, 19)
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Specification