Delta-theta frequency estimation
First Claim
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1. A device for frequency estimation comprising:
- an intra-header module configured to estimate, for each of a plurality of physical layer headers of a received wireless signal, an intra-header frequency error utilizing intra-header phase difference measurements;
a frequency error correction module, communicatively coupled with the intra-header module, and configured to iteratively correct a frequency error for the received wireless signal utilizing the calculated frequency errors;
a threshold comparator module, communicatively coupled with the frequency correction module, and configured to signal the frequency error correction module to suspend the intra-header corrections when intra-header frequency errors fall below a threshold and signal for activation of an inter-frame module when intra-header frequency errors fall below the threshold; and
the inter-frame module, communicatively coupled with the threshold comparator module, and configured to track a frequency error for the received wireless signal utilizing inter-frame phase difference measurements when signaled by the threshold comparator module.
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Abstract
Systems, devices, processors, and methods are described which may be used for the reception of a wireless broadband signal at a user terminal from a gateway via satellite. A physical layer header may be identified, the header including a number of subcode blocks. A phase may be estimated for each of the subcode blocks, and intra-header phase differences may be calculated. The intra-header phase differences may be used to calculate a frequency error, which may be corrected. Frequency errors may be monitored and, when such errors fall below a threshold level, an alternative inter-frame frequency error tracking method may be used.
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Citations
22 Claims
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1. A device for frequency estimation comprising:
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an intra-header module configured to estimate, for each of a plurality of physical layer headers of a received wireless signal, an intra-header frequency error utilizing intra-header phase difference measurements; a frequency error correction module, communicatively coupled with the intra-header module, and configured to iteratively correct a frequency error for the received wireless signal utilizing the calculated frequency errors; a threshold comparator module, communicatively coupled with the frequency correction module, and configured to signal the frequency error correction module to suspend the intra-header corrections when intra-header frequency errors fall below a threshold and signal for activation of an inter-frame module when intra-header frequency errors fall below the threshold; and the inter-frame module, communicatively coupled with the threshold comparator module, and configured to track a frequency error for the received wireless signal utilizing inter-frame phase difference measurements when signaled by the threshold comparator module. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A method for frequency estimation comprising:
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estimating, for each of a plurality of physical layer headers of a received wireless signal, an intra-header frequency error utilizing intra-header phase difference measurements; iteratively correcting a frequency error for the received wireless signal utilizing the estimated intra-header frequency errors; and activating inter-frame frequency error correction when the intra-header frequency errors fall below a threshold, the activating comprising; suspending the intra-header corrections utilizing the estimated intra-header frequency errors; and tracking a frequency error for the received wireless signal utilizing inter-frame phase difference measurements. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20, 21, 22)
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Specification