Synchronization and tracking in a digital communication system
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United States of America Patent
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Apr 18, 2000
Issued Date -
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app pub date -
Jul 8, 1999
filing date -
Apr 17, 1997
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Abstract
There is disclosed a bit sync search and frame sync search system operative with a digital data signal as transmitted by a digital radio transmitter. The bit search is implemented by detecting a predetermined phasing signal which is incorporated in the digital signal and which has a repetitive bit pattern of ones and zeroes. The phasing signal is first detected by providing an in-phase and quadrature component signal and correlating those signals to provide an output signal indicative of the bit pattern in the phasing signal. After the phasing signal has been provided and an oscillator associated with a receiving apparatus is compensated according to the detected phasing signal, a tracking mode is entered, whereby a frame signal is captured and the system generates histograms of data bit transitions for producing an error signal indicative of the difference of the transmitted clock rate and the sampling portion of a received bit. In this manner, by adjusting the clock according to the error signal produced by the histogram process one can be assured that the sampling rate at the receiver will occur relatively at the center of each bit to therefore provide reliable decoding or detection of the received digital data signal in the presence of the noise.
First Claim
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- 15 United States
- 10 France
- 8 Japan
- 7 China
- 5 Korea
- 2 Other
Patent Owner(s)
- HARRIS CORPORATION;ITT MANUFACTURING ENTERPRISES, INC.
International Classification(s)
Inventor(s)
Inventor Name | Address | # of filed Patents | Total Citations |
---|---|---|---|
Blois, Gary Vincent | Towaco, NJ | 3 | 40 |
Epstein, Marvin A | Monsey, NY | 12 | 298 |
Fine, Joseph Michael | West Caldwell, NJ | 3 | 40 |
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Fee | Large entity fee | small entity fee | micro entity fee |
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Surcharge after expiration - Late payment is unavoidable | $700.00 | $350.00 | $175.00 |
Surcharge after expiration - Late payment is unintentional | $1,640.00 | $820.00 | $410.00 |
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