Communications – electrical: acoustic wave systems and devices – Underwater system – Telemetering
Reexamination Certificate
2007-12-18
2007-12-18
Lobo, Ian J. (Department: 3662)
Communications, electrical: acoustic wave systems and devices
Underwater system
Telemetering
C340S850000
Reexamination Certificate
active
11183308
ABSTRACT:
An undersea communications system in which a message is converted to a redundant fixed-length data packet and transmitted acoustically as a quadrature phase-keyed signal in a frequency band with a continuous pilot signal at a frequency closely adjacent to the frequency band. A receiver uses the received continuous pilot signal to Doppler compensate the incoming quadrature phase keyed signal by estimating any Doppler distortion in the received pilot signal. The resultant redundant signals are then robustly processed coherently and jointly by the adaptive decision feedback equalizer and decoder to provide the original transmitted data.
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Blackmon Fletcher A.
Fitzpatrick Kevin C.
Jarvis Susan M.
Morrissey Ronald R.
Pendergrass Nixon
Kasischke James M.
Lobo Ian J.
Nasser Jean-Paul A.
Stanley Michael P.
The United States of America represented by the Secretary of the
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