Spread spectrum signal detection with inhibiting for known sidelobe locations
First Claim
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1. A method for detecting a spread spectrum signal within a received signal, the spread spectrum signal being encoded with a spreading code, the method comprising:
- correlating the received signal with a spreading code replica using a plurality of signal parameter hypotheses to produce a plurality of correlation values, each correlation value corresponding to a particular one of the signal parameter hypotheses;
declaring a signal presence at a detected signal parameter hypothesis when the correlation value corresponding to the detected signal parameter hypotheses exceeds a detection threshold; and
inhibiting the declaring of a signal presence for signal parameter hypotheses at offsets from the detected signal parameter hypothesis that correspond to known sidelobe locations of the spreading code.
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Abstract
A method and apparatus for detecting a spread spectrum signal is described. Signals can be detected using correlation techniques. When a signal is detected, declaring of signal presence is inhibited for offsets of signal parameters from the parameters of the detected signal, where the offset corresponds to a known sidelobe of the spreading code. This helps to reduce false detections caused by sidelobes of the spreading code.
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22 Claims
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1. A method for detecting a spread spectrum signal within a received signal, the spread spectrum signal being encoded with a spreading code, the method comprising:
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correlating the received signal with a spreading code replica using a plurality of signal parameter hypotheses to produce a plurality of correlation values, each correlation value corresponding to a particular one of the signal parameter hypotheses; declaring a signal presence at a detected signal parameter hypothesis when the correlation value corresponding to the detected signal parameter hypotheses exceeds a detection threshold; and inhibiting the declaring of a signal presence for signal parameter hypotheses at offsets from the detected signal parameter hypothesis that correspond to known sidelobe locations of the spreading code. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A system for detecting a spread spectrum signal having a predefined spreading code and embedded within a received signal, the system comprising:
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a correlator configured to accept the received signal and produce a plurality of correlation results corresponding to a plurality of signal parameter hypotheses; a signal detector operatively coupled to the correlator and configured to declare a signal detection when a correlation result meets a predetermined criteria, an inhibitor operatively coupled to the signal detector and configured to inhibit the signal detector from declaring additional signal detections for signal parameter hypotheses that are offset from the signal parameter hypothesis corresponding to the signal detection, the offsets being amounts corresponding to known sidelobes of the predefined spreading code. - View Dependent Claims (15, 16, 17, 18, 19, 20)
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21. A system for detecting spread spectrum signals having a predefined spreading code and embedded within a received signal, the system comprising:
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means for correlating the received signal with a spreading code replica to produce a plurality of correlation results corresponding to a plurality of signal parameter hypotheses; means for processing the plurality of correlation results to detect spread spectrum signals; means for inhibiting the detection of additional spread spectrum signals at signal parameter hypotheses that are at offsets from the signal parameter hypotheses of detected spread spectrum signals, wherein the offsets correspond to known sidelobes of the predefined spreading code. - View Dependent Claims (22)
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Specification