SHIELDING FLAW DETECTION AND MEASUREMENT IN ORTHOGONAL FREQUENCY DIVISION MULTIPLEXED (OFDM) CABLE TELECOMMUNICATIONS ENVIRONMENT
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United States of America Patent
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app pub date -
May 20, 2014
filing date -
Apr 6, 2011
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Abandoned
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Abstract
An egress signal from a broadband communication system (BCS) including orthogonal frequency division multiplex (OFDM) signals is distinguished from noise and broadcast transmissions and authenticated as such by detecting required or optional pilot signals by their frequency, pattern and/or other characteristics such as recurrence rate or cepstral interval. Detection is made more robust by detection of combinations of required or optional pilot tones. Different BCS plants in the same geographic area or overbuilt can be discriminated based on the frequencies and frequency intervals of required, fixed frequency PHY link channel (PLC) related pilots, pattern and frequency of the presence or absence of optional pilots at fixed frequency intervals and/or cepstral or recurrence intervals of required scattered pilots if different symbol rates are employed or frequency of scattered pilots if the OFDM bands do not overlap in the adjacent or overbuilt BCSs.
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