Frequency offset correction
First Claim
1. Device for correcting a frequency offset between a receive signal and a reference signal, said receive signal being fed to a frequency converter which also receives a conversion signal in order to produce a transposed signal, said conversion signal being produced by a local oscillator in response to a control signal, said device comprising:
- means for initializing said control signal according to said reference signal;
estimator means which receive said transposed signal and said control signal to produce repetitively an estimate of said frequency offset, said estimate comprising the sum of a correction value and an adjustment value, said correction value being greater than or equal to a predetermined correction threshold and said adjustment value being less than said predetermined correction threshold;
means for modifying said control signal in response to said correction value; and
means for correcting said transposed signal by means of at least one of said successive estimates.
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Accused Products
Abstract
In a method and a device for correcting a frequency offset between a receive signal and a reference signal, the receive signal, being fed to a frequency converter which also receives a conversion signal in order to produce a transposed signal, the conversion signal is produced by a local oscillator in response to a control signal. The device initializes the control signal according to the reference signal. An estimator receives the transposed signal and the control signal and produces repetitively an estimate of the frequency offset comprising the sum of a correction value and an adjustment value respectively greater than and less than a predetermined correction threshold. The control signal is modified in response to the correction value. The transposed signal is connected using at least one of the successive estimates.
42 Citations
17 Claims
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1. Device for correcting a frequency offset between a receive signal and a reference signal, said receive signal being fed to a frequency converter which also receives a conversion signal in order to produce a transposed signal, said conversion signal being produced by a local oscillator in response to a control signal, said device comprising:
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means for initializing said control signal according to said reference signal; estimator means which receive said transposed signal and said control signal to produce repetitively an estimate of said frequency offset, said estimate comprising the sum of a correction value and an adjustment value, said correction value being greater than or equal to a predetermined correction threshold and said adjustment value being less than said predetermined correction threshold; means for modifying said control signal in response to said correction value; and means for correcting said transposed signal by means of at least one of said successive estimates. - View Dependent Claims (2, 3, 4, 5, 6, 7, 9, 10, 11)
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8. Method of correcting a frequency offset between a receive signal and a conversion signal comprising the following steps:
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converting said receive signal by means of a conversion signal to produce a transposed signal; a first estimate of said frequency offset; modifying said conversion signal when said first estimate exceeds a predetermined correction threshold, said first estimate comprising a sum of a correction value which is a multiple of said predetermined correction threshold and an adjustment value which is less than said predetermined correction threshold, said modifying step including modifying said conversion signal based on said correction value; producing an estimate of the residual frequency offset between said receive signal and said modified conversion signal; and correcting said transposed signal by means of said residual offset. - View Dependent Claims (12, 13)
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14. A device for correcting a frequency offset between a receive signal and a reference signal, said receive signal being fed to a frequency converter which also receives a conversion signal in order to produce a transposed signal, said conversion signal being produced by a local oscillator in response to a control signal, said device comprising:
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means for initializing said control signal according to said reference signal; estimator means which receives said transposed signal and repetitively produces an estimate of said frequency offset; means for modifying said control signal when said estimate exceeds a predetermined correction threshold, said estimate comprising a sum of a correction value which is a multiple of said predetermined correction threshold and an adjustment value which is less than said predetermined correction threshold, said means for modifying modifying said control signal based on said correction value; and means for correcting said transposed signal produced by said frequency converter by calculating a corrected transposed signal from said transposed signal and from one of said estimate and said adjustment value. - View Dependent Claims (15)
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16. A method of correcting a frequency offset between a receive signal and a conversion signal comprising the steps of:
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converting said receive signal by means of a conversion signal to produce a transposed signal; producing an estimate of said frequency offset; modifying said conversion signal when said estimate exceeds a predetermined correction threshold, said estimate comprising a sum of a correction value which is a multiple of said predetermined correction threshold and an adjustment value which is less than said predetermined correction threshold, said modifying step including modifying said control signal based on said correction value; and calculating a corrected transposed signal from said transposed signal and from a function of said estimate. - View Dependent Claims (17)
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Specification