Method and system for temporal autocorrelation filtering
First Claim
1. A method for generating a synchronization clock signal for a receiver, comprising:
- partially removing phase with lag from a spread spectrum signal by using an autocorrelation filter;
generating a first correlation and a second correlation using respective correlators configured to receive the output of the autocorrelation filter;
comparing the first correlation and the second correlation using a comparator to locate a peak correlation and produce a corresponding comparator output;
controlling a voltage controlled oscillator by using the comparator output; and
producing the synchronization clock signal by using an output of the voltage controlled oscillator.
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Abstract
An autocorrelation filter for use with a spread spectrum receiver. The autocorrelation filter can be used as a prefilter stage to reduce phase distortion present in a spread spectrum signal. The autocorrelation filter can be used to process the output from a lattice filter. The lattice filter is configured to remove magnitude distortion from the spread spectrum signal. The autocorrelation filter performs a series of correlations on the output of the lattice filter. The results of these correlations are integrated over a period of time to generate a running impulse response for characterizing and removing the phase distortion in the spread spectrum signal.
78 Citations
14 Claims
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1. A method for generating a synchronization clock signal for a receiver, comprising:
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partially removing phase with lag from a spread spectrum signal by using an autocorrelation filter; generating a first correlation and a second correlation using respective correlators configured to receive the output of the autocorrelation filter; comparing the first correlation and the second correlation using a comparator to locate a peak correlation and produce a corresponding comparator output; controlling a voltage controlled oscillator by using the comparator output; and producing the synchronization clock signal by using an output of the voltage controlled oscillator. - View Dependent Claims (2, 3, 4, 5, 13, 14)
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6. A system for generating a synchronization clock signal for a receiver, the system comprising:
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an autocorrelation filter arranged to partially remove phase with lag from a spread spectrum signal; a first and second correlator arranged to receive the output of the autocorrelation filter and to generate a first correlation and a second correlation, respectively; a comparator to compare the first correlation to the second correlation to locate a peak correlation and produce a corresponding comparator output; and a voltage controlled oscillator that is controlled by the comparator output and that produces an output for use as the synchronization clock signal. - View Dependent Claims (7, 8, 9, 10, 11, 12)
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Specification