METHOD OF PROVIDING A DATA SIGNAL FOR CHANNEL ESTIMATION AND CIRCUIT THEREOF
First Claim
1. A method of providing a data signal in a frequency domain corrected for distortion, comprising:
- converting a received signal having pilots to a first signal having the pilots in the frequency domain;
extracting the pilots from the first signal to obtain extracted pilots to form a second signal;
using the second signal to provide a first estimate of a channel;
converting the first estimate to the time domain;
removing noise from the first estimate in the time domain to provide a second estimate of the channel in the time domain;
determining an autocorrelation of the channel in the frequency domain using the second estimate of the channel;
determining extension signals using the autocorrelation;
appending the extension signals to the first estimate of the channel to obtain a third estimate of the channel; and
using the third estimate to provide the data signal in the frequency domain.
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Accused Products
Abstract
A received signal having pilots is converted to a first signal in the frequency domain having the pilots. The pilots are extracted from the first signal to obtain extracted pilots to form a second signal. The second signal is used to provide a first estimate of a channel. The first estimate is converted to the time domain. Noise is removed from the first estimate in the time domain to provide a second estimate of the channel in the time domain. An autocorrelation of the channel in the frequency domain is determined using the second estimate of the channel. Extension signals are determined using the autocorrelation. The extension signals are appended to the first estimate of the channel to obtain a third estimate of the channel. The third estimate is used to provide a data signal in the frequency domain.
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Citations
20 Claims
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1. A method of providing a data signal in a frequency domain corrected for distortion, comprising:
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converting a received signal having pilots to a first signal having the pilots in the frequency domain; extracting the pilots from the first signal to obtain extracted pilots to form a second signal; using the second signal to provide a first estimate of a channel; converting the first estimate to the time domain; removing noise from the first estimate in the time domain to provide a second estimate of the channel in the time domain; determining an autocorrelation of the channel in the frequency domain using the second estimate of the channel; determining extension signals using the autocorrelation; appending the extension signals to the first estimate of the channel to obtain a third estimate of the channel; and using the third estimate to provide the data signal in the frequency domain. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A method of providing a resultant frequency domain signal based on a time domain signal having pilots useful in estimating a channel through which the time domain signal traveled, comprising:
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obtaining an input frequency domain signal derived from the time domain signal; providing a first estimate of the channel using pilots from the input frequency domain signal; determining an autocorrelation based on the first estimate of the channel; adding extension signals to the first estimate of the channel based on the autocorrelation to obtain a second estimate of the channel; using, which includes performing an inverse fast Fourier transform and a fast Fourier transform, the second estimate of the channel to obtain a third estimate of the channel; and using the third estimate of the channel on the input frequency domain signal to provide the resultant frequency domain signal. - View Dependent Claims (14, 15, 16, 17)
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18. A circuit for providing a resultant frequency domain signal in response to a time domain signal having pilots useful in estimating a channel through which the time domain signal traveled, comprising:
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means for obtaining an input frequency domain signal derived from the time domain signal; means for providing a first estimate of the channel using pilots from the input frequency domain signal; means for determining an autocorrelation based on the first estimate of the channel; means for adding extension signals to the first estimate of the channel based on the autocorrelation to obtain a second estimate of the channel; means for using, which includes performing an inverse fast Fourier transform and a fast Fourier transform, the second estimate of the channel to obtain a third estimate of the channel; and means for using the third estimate of the channel on the input frequency domain signal to provide the resultant frequency domain signal. - View Dependent Claims (19, 20)
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Specification