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US 10,374,838 B2Granted
Image distortion correction in a wireless terminal
AssigneeFuturewei Technologies, Inc.
InventorsHong Jiang, Jamil Mark Forrester, Zhihang Zhang
Life of this patent
Estimating the term…
Abstract
A circuit in a wireless communications terminal/device and a method is described for reducing an image distortion. By measuring three gain mismatches of I path and Q path of a transceiver, and estimating a value of an IQ mismatch coefficient based on the three gain mismatches; and applying a measurement adjustment to the I path or the Q path based on the value of the IQ mismatch coefficient, the image distortion is reduced.
Claims17
A method performed by a wireless terminal including a transceiver, the method comprising:
- measuring, by the wireless terminal, a first gain mismatch of I path and Q path of the transceiver having a first RF gain setting, a second gain mismatch of I path and Q path of the transceiver having a second RF gain setting, and a third gain mismatch of I path and Q path of the transceiver having a third RF gain setting;
- estimating, by the wireless terminal, a value of an IQ mismatch coefficient based on the first gain mismatch, the second gain mismatch and the third gain mismatch;
- and
- applying, by the wireless terminal, a measurement adjustment to I path or Q path based on the value of the IQ mismatch coefficient to reduce an image distortion,
- wherein the estimating the value of the IQ mismatch coefficient comprises:
- estimating, by the wireless terminal, a value of a static gain mismatch coefficient based on the first gain mismatch and the second gain mismatch;
- and
- estimating, by the wireless terminal, the value of the IQ mismatch coefficient based on the static gain mismatch coefficient and the third gain mismatch.
5 more elements
A wireless terminal, comprising:
- a digital baseband circuitry;
- and
- a transceiver,
- wherein the transceiver having a first RF gain setting is configured to send a first measurement to the digital baseband circuitry, the transceiver having a second RF gain setting is configured to send a second measurement to the digital baseband circuitry, and the transceiver having a third RF gain setting is configured to send a third measurement to the digital baseband circuitry,
- wherein the digital baseband circuitry is configured to measure a first gain mismatch of I path and Q path of the transceiver based on the first measurement, a second gain mismatch of I path and Q path of the transceiver based on the second measurement, and a third gain mismatch of I path and Q path of the transceiver based on the third measurement,
- wherein the digital baseband circuitry is further configured to estimate a value of an IQ mismatch coefficient based on the first gain mismatch, the second gain mismatch and the third gain mismatch, and to apply a measurement adjustment to the I path or the Q path based on the value of the IQ mismatch coefficient, and
- wherein the digital baseband circuitry is configured to estimate a value of a static gain mismatch coefficient based on the first gain mismatch and the second gain mismatch, and estimate the value of the IQ mismatch coefficient based on the static gain mismatch coefficient and the third gain mismatch.
4 more elements
A digital baseband circuitry, comprising:
- a non-transitory memory storage comprising instructions;
- one or more processors in communication with the memory, wherein the one or more processors execute the instructions to:
- measure a first gain mismatch of I path and Q path of a transceiver having a first RF gain setting, a second gain mismatch of I path and Q path of the transceiver having a second RF gain setting, and a third gain mismatch of I path and Q path of the transceiver having a third RF gain setting;
- estimate, a value of an IQ mismatch coefficient based on the first gain mismatch, the second gain mismatch and the third gain mismatch;
- estimate a value of a static gain mismatch coefficient based on the first gain mismatch and the second gain mismatch;
- estimate the value of the IQ mismatch coefficient based on the static gain mismatch coefficient and the third gain mismatch;
- and
- apply a measurement adjustment to the I path or the Q path based on the value of the IQ mismatch coefficient to reduce an image distortion.
5 more elements
Dependencies are inferred from the claim text.