Radio receiver and method of operation
First Claim
1. A gain compensation loop for a quadrature receiver adapted to generate first and second quadrature signals from a received signal, the gain compensation loop comprising:
- a signal strength comparator for receiving the first and second signals and adapted to output a third signal indicative of a difference in signal strength between the first and second signals; and
gain adjusting means for adjusting the relative strength of the first signal compared to the second signal in accordance with the third signal, thereby bringing the first and second signals towards the same strength.
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Accused Products
Abstract
A gain compensation loop suitable for a quadrature receiver comprises a signal strength comparator having in-phase and quadrature signals fed to respective inputs of the signal strength comparator. The signal strength comparator outputs a signal which represents the difference in strength between the in-phase and quadrature signals. The signal output from the signal strength comparator is input to a gain adjuster which adjusts the gain of the in-phase or quadrature signal in accordance with the signal from the signal strength comparator to bring the in-phase and quadrature signals towards the same strength.
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Citations
14 Claims
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1. A gain compensation loop for a quadrature receiver adapted to generate first and second quadrature signals from a received signal, the gain compensation loop comprising:
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a signal strength comparator for receiving the first and second signals and adapted to output a third signal indicative of a difference in signal strength between the first and second signals; and
gain adjusting means for adjusting the relative strength of the first signal compared to the second signal in accordance with the third signal, thereby bringing the first and second signals towards the same strength. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method for gain compensation in a quadrature receiver adapted to generate first and second quadrature signals from a received signal, the method comprising the steps of:
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comparing the signal strength of the first signal with the signal strength of the second signal;
deriving a third signal indicative of a difference in strength between the first and second signals; and
adjusting the relative strength of the first signal compared to the second signal in accordance with the third signal.
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9. A gain compensation loop for a quadrature receiver adapted to generate I and Q quadrature signals from a received signal, the gain compensation loop comprising:
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a signal strength comparator for receiving the I and Q signals and adapted to output a third signal indicative of a difference in signal strength between the I and Q signals; and
gain adjusting means for adjusting the relative strength of;
one signal selected from a group consisting of;
the I signal and the Q signal,in accordance with the third signal, thereby bringing the I and Q signals towards the same strength.
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10. A method for gain compensation in a quadrature receiver adapted to generate I and Q quadrature signals from a received signal, the method comprising the steps of:
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comparing the signal strength of the I signal with the signal strength of the Q signal;
deriving a third signal indicative of a difference in strength between the I and Q signals; and
adjusting the relative strength of one signal selected from a group consisting of the I signal and the Q signal, in accordance with the third signal.
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11. A communications device comprising:
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a radio telephone, the radio telephone comprising;
a gain compensation loop for a quadrature receiver adapted to generate first and second quadrature signals from a received signal, the gain compensation loop comprising;
a signal strength comparator for receiving the first and second signals and adapted to output a third signal indicative of a difference in signal strength between the first and second signals; and
gain adjusting means for adjusting the relative strength of the first signal compared to the second signal in accordance with the third signal, thereby bringing the first and second signals towards the same strength.
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12. A method for gain compensation in a communications device, the method comprising the steps of:
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adapting a quadrature receiver to generate first and second quadrature signals from a received signal, the quadrature receiver being located in a radio telephone device, adapting the quadrature receiver to generate first and second quadrature signals further comprises the steps of;
comparing the signal strength of the first signal with the signal strength of the second signal;
deriving a third signal indicative of a difference in strength between the first and second signals; and
adjusting the relative strength of the first signal compared to the second signal in accordance with the third signal.
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13. A communications device comprising:
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a radio telephone device, the radio telephone device comprising;
a gain compensation loop for a quadrature receiver adapted to generate I and Q quadrature signals from a received signal, the gain compensation loop comprising;
a signal strength comparator for receiving the I and Q signals and adapted to output a third signal indicative of a difference in signal strength between the I and Q signals; and
gain adjusting means for adjusting the relative strength of;
one signal selected from a group consisting of;
the I signal and the Q signal,in accordance with the third signal, thereby bringing the I and Q signals towards the same strength.
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14. A method for gain compensation in a communications device, the method comprising the steps of:
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generating I and Q quadrature signals from a signal, wherein the signal is received by a radio telephone device;
comparing the signal strength of the I signal with the signal strength of the Q signal;
deriving a third signal indicative of a difference in strength between the I and Q signals; and
adjusting the relative strength of one signal selected from a group consisting of the I signal and the Q signal, in accordance with the third signal.
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Specification