Method and system for temporal autocorrelation filtering
First Claim
1. A spread spectrum receiver, comprising:
- an antenna for receiving a spread spectrum signal;
a lattice filter coupled to the antenna, wherein the lattice filter is configured to remove magnitude distortion from the spread spectrum signal to produce a lattice filter output; and
an autocorrelation filter coupled to receive the lattice filter output, wherein the autocorrelation filter is configured to remove phase distortion from the lattice filter output.
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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.
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Citations
43 Claims
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1. A spread spectrum receiver, comprising:
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an antenna for receiving a spread spectrum signal;
a lattice filter coupled to the antenna, wherein the lattice filter is configured to remove magnitude distortion from the spread spectrum signal to produce a lattice filter output; and
an autocorrelation filter coupled to receive the lattice filter output, wherein the autocorrelation filter is configured to remove phase distortion from the lattice filter output. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A spread spectrum receiver, comprising:
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an antenna for receiving a spread spectrum signal; and
an autocorrelation filter coupled to the antenna, wherein the autocorrelation filter is configured to remove phase distortion from the spread spectrum signal received by the antenna. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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- 15. An autocorrelation filter for removing phase distortion from a spread spectrum signal.
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25. A method for filtering out phase distortion from a spread spectrum receiver, comprising:
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receiving a spread spectrum signal;
digitizing the spread spectrum signal;
removing magnitude distortion from the spread spectrum signal by using a lattice filter; and
removing phase distortion from the spread spectrum signal by using an autocorrelation filter. - View Dependent Claims (26, 27, 28, 29, 30, 31)
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32. A method for filtering out phase distortion from a spread spectrum receiver, comprising:
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receiving a spread spectrum signal;
digitizing the spread spectrum signal; and
removing phase distortion from the spread spectrum signal by using an autocorrelation filter. - View Dependent Claims (33, 34, 35, 36, 37, 38)
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39. 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 (40, 41, 42, 43)
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Specification