System and method for digital timing error correction in a communications system utilizing adaptive predistortion
First Claim
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11. A method for timing error correction in an adaptive predistortion linearized communications system, comprising:
- receiving an input signal comprising discrete signal samples from an input to the communications system;
receiving an output signal comprising discrete signal samples from an output of the communications system;
computing a cross-correlation function between said input and output signals;
initiating a delay-locked loop employing the results of said cross-correlation computation; and
adjusting the relative timing of said input and output signals using the output of said delay-locked loop.
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Abstract
A system and method for rapidly correcting the time difference between two signals is disclosed. In particular, a system and method for very rapidly correcting timing errors to the very high degree of accuracy required for digital predistortion adaptation is disclosed. The method is a signal processing technique, which can be performed in either hardware or software, which employs a correlation computation. The correlation results are processed in a manner that enables very rapid and accurate estimation of the time difference between the two signals.
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Citations
20 Claims
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11. A method for timing error correction in an adaptive predistortion linearized communications system, comprising:
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receiving an input signal comprising discrete signal samples from an input to the communications system;
receiving an output signal comprising discrete signal samples from an output of the communications system;
computing a cross-correlation function between said input and output signals;
initiating a delay-locked loop employing the results of said cross-correlation computation; and
adjusting the relative timing of said input and output signals using the output of said delay-locked loop. - View Dependent Claims (1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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16-1. A system for timing error correction as set out in claim 15, further comprising a summation block coupled to the cross-correlation computation block for accumulating the output of said cross-correlation computation block.
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