SAMPLING CLOCK OFFSET TRACKING AND SYMBOL RE-TIMING
First Claim
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1. A method for sampling clock tracking at a receiver, the method comprising:
- receiving a plurality of wireless signals, wherein at least a subset of the plurality of wireless signals includes a control signal known at the receiver;
correlating a first received signal of the plurality of wireless signals with the control signal to produce a reference correlation;
correlating a later, second received signal of the plurality of wireless signals with the control signal to produce a second correlation; and
calculating a difference measurement between the reference correlation and the second correlation to estimate drift for the second received signal.
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Abstract
Systems, devices, and methods are described for sampling clock offset tracking and timing correction. Wireless signals are received, some of which include a control signal known at the receiver. A first received signal may be correlated with the control signal to produce a reference correlation. A second, later received signal may be correlated with the control signal to produce a second correlation. A difference measurement between the reference correlation and the second correlation may be calculated to estimate drift. The estimated drift may be corrected.
17 Citations
25 Claims
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1. A method for sampling clock tracking at a receiver, the method comprising:
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receiving a plurality of wireless signals, wherein at least a subset of the plurality of wireless signals includes a control signal known at the receiver; correlating a first received signal of the plurality of wireless signals with the control signal to produce a reference correlation; correlating a later, second received signal of the plurality of wireless signals with the control signal to produce a second correlation; and calculating a difference measurement between the reference correlation and the second correlation to estimate drift for the second received signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A processor for sampling clock tracking at a receiver, the processor configured to:
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correlate a first received signal including a known periodic control signal with the known periodic control signal to produce a reference correlation; correlate a later, second received signal including the known periodic control signal with the known control signal to produce a second correlation; and calculate a difference measurement between the reference correlation and the second correlation to estimate drift of the second received signal. - View Dependent Claims (13)
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14. A device for sampling clock tracking, the device comprising:
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a receiving unit configured to receive a plurality of wireless signals, wherein at least a subset of the plurality of wireless signals includes a control signal known at the device; a correlating unit, communicatively coupled with the receiving unit, and configured to; correlate a first received signal of the plurality of wireless signals with the control signal to produce a reference correlation; and correlate a later, second received signal of the plurality of wireless signals with the control signal to produce a second correlation; and a measurement unit, communicatively coupled with the correlating unit, configured to calculate a difference measurement between the reference correlation and the second correlation to estimate drift of the second received signal. - View Dependent Claims (15, 16, 17, 18, 19, 20, 21, 22, 23, 24)
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25. A system for tracking and correcting drift at a mobile communications device, the system comprising:
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a base station configured to transmit plurality of wireless signals, wherein at least a subset of the plurality of wireless signals includes a periodic control signal known at a receiving device; and the receiving device, in wireless communication with the base station, and configured to; receive the plurality of wireless signals; correlate first received signal of the plurality of wireless signals with the known periodic control signal to produce a reference correlation; correlate a later, second received signal of the plurality of wireless signals with the known, periodic control signal to produce a second correlation; calculate a difference measurement between the reference correlation and the second correlation to estimate drift of the second received signal; and modify a sampling rate at the receiver to correct for the estimated drift.
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Specification