System and method for synchronization tracking in an in-band modem
First Claim
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1. A method for identifying a sample slip in the transmission channel of an in-band modem comprising:
- receiving a synchronization sequence, wherein the synchronization sequence comprises at least a repeating pseudorandom sequence;
correlating the received synchronization sequence with a reference signal;
computing a plurality of correlation peaks based on the repeating pseudorandom sequence when synchronization is locked at a receiver;
computing a correlation peak shape, wherein the computing a correlation peak shape comprises combining the peaks; and
identifying the sample slip based on the correlation peak shape.
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Abstract
Processing the synchronization of an inband modem to detect sample slip conditions is disclosed. Decision logic reliably detects the sample slip condition while minimizing the number of false alarms.
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Citations
11 Claims
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1. A method for identifying a sample slip in the transmission channel of an in-band modem comprising:
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receiving a synchronization sequence, wherein the synchronization sequence comprises at least a repeating pseudorandom sequence; correlating the received synchronization sequence with a reference signal; computing a plurality of correlation peaks based on the repeating pseudorandom sequence when synchronization is locked at a receiver; computing a correlation peak shape, wherein the computing a correlation peak shape comprises combining the peaks; and identifying the sample slip based on the correlation peak shape. - View Dependent Claims (2, 3)
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4. An apparatus for identifying a sample slip in the transmission channel of an in-band modem comprising:
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a receiver for receiving a synchronization sequence, wherein the synchronization sequence comprises at least a repeating pseudorandom sequence; a correlator for correlating the received synchronization sequence with a reference signal; and a processor for computing a plurality of correlation peaks based on the repeating pseudorandom sequence when synchronization is locked at a receiver, computing a correlation peak shape, wherein the computing a correlation peak shape comprises combining the peaks, and identifying the sample slip based on the correlation peak shape. - View Dependent Claims (5, 6)
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7. An apparatus for identifying a sample slip in the transmission channel of an in-band modem comprising:
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means for receiving a synchronization sequence, wherein the synchronization sequence comprises at least a repeating pseudorandom sequence; means for correlating the received synchronization sequence with a reference signal; means for computing a plurality of correlation peaks based on the repeating pseudorandom sequence when synchronization is locked at a receiver; means for computing a correlation peak shape, wherein the means for computing a correlation peak shape comprises means for combining the peaks; and means for identifying the sample slip based on the correlation peak shape. - View Dependent Claims (8, 9)
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10. A non-transitory memory storing a computer program that, when executed, causes a computer to perform the acts of:
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receiving a synchronization sequence, wherein the synchronization sequence comprises at least a repeating pseudorandom sequence; correlating the received synchronization sequence with a reference signal; computing a plurality of correlation peaks based on the repeating pseudorandom sequence when synchronization is locked at a receiver; computing a correlation peak shape, wherein the computing a correlation peak shape comprises combining the peaks; and identifying the sample slip based on the correlation peak shape. - View Dependent Claims (11)
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Specification