Downstream OFDM signal egress detection
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United States of America Patent
Stats
-
Jun 21, 2016
Issued Date -
N/A
app pub date -
Jun 26, 2015
filing date -
Jun 27, 2014
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A cyclic prefix which duplicates some samples of a terminal portion of a symbol in an OFDM data stream and which is invariant in pilot tones can be detected in the presence of signals having higher levels of noise and broadcast signals by autocorrelation with one of two selected “lags”. Autocorrelation will be found when the lag is equal to the number of samples in the FFT used to form a symbol in the data stream. A far stronger autocorrelation is found when the lag is equal to the sum of the FFT length and the length of the cyclic prefix and applied to pilots in the data stream. Overbuilt systems can be distinguished from a system of interest by use of pilots that do not coincide in frequency with a pilot of an overbuilt system.
First Claim
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Family
International Classification(s)
- 2015 Application Filing Year
- H04L Class
- 33706 Applications Filed
- 25909 Patents Issued To-Date
- 76.87 % Issued To-Date
Cited Art Landscape
Patent Citation Ranking
- 5 Citation Count
- H04L Class
- 8.87 % this patent is cited more than
- 9 Age
Maintenance Fees
| Fee | Large entity fee | small entity fee | micro entity fee | due date |
|---|---|---|---|---|
| 11.5 Year Payment | $7400.00 | $3700.00 | $1850.00 | Dec 21, 2027 |
