| Time Diversity Automatic Repeat Request (ARQ) Equalization Scheme |
19 JAN 2005 |
19 pages |
| Authors:
Fletcher A. Blackmon; NAVAL UNDERSEA WARFARE CENTER DIV NEWPORT RI
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 | A method and system are provided for processing communication signals. In one embodiment, the method has the steps of providing a data signal based on a communication signal transmitted from a transmitting source, processing the data signal to determine if the data signal has acceptable error characteristics, requesting retransmission of the data signal if the data signal does not have acceptable error characteristics, coherently and jointly equalizing the data signal ... |
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| Decision Feedback Equalization Pre-Processor with Turbo Equalizer |
25 FEB 2004 |
21 pages |
| Authors:
Fletcher A. Blackmon; DEPARTMENT OF THE NAVY WASHINGTON DC
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| The present invention provides a receiver for underwater acoustic telemetry that combines a decision feedback adaptive-equalizer structure with a turbo-equalizer structure. The turbo-equalizer structure is of significantly reduced complexity because the decision feedback adaptive-equalizer structure is operable to pre-process a plurality of data channels to provide a single symbol data output stream for application to the input of the turbo equalizer. The turbo-equalizer structure is also of reduced complexity due ... |
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| Laser-Based Acousto-Optic Uplink Communications Technique |
18 AUG 2003 |
12 pages |
| Authors:
Fletcher A. Blackmon; DEPARTMENT OF THE NAVY WASHINGTON DC
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| An apparatus for enabling acousto-optic communication comprising an in-water platform comprising means for emitting an acoustic signal to an acousto-optic interaction zone, an in-air platform comprising the ability for transmitting a first optical interrogation beam, the ability for receiving a portion of the first interrogation beam and a second laser beam formed from the reflection of the first interrogation beam off of the acousto- optic interaction zone, the ability for ... |
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| Low Power Transmitter Providing Selectable Waveform Generation. |
03 DEC 1996 |
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| Authors:
Fletcher A. Blackmon; DEPARTMENT OF THE NAVY WASHINGTON DC
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 | A low power transmitter providing selectable waveforms includes a self contained power source, such as a battery. A timer powered by the battery provides a transmitter actuation signal after a predetermined delay. A voltage regulator coupled to the power source and to the timer provides power in response to the transmitter actuation signal. A waveform generator coupled to the voltage regulator provides one or more selected continuous or pulse waveforms ... |
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| Arbitrary Waveform Generator. |
02 NOV 1993 |
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| Authors:
Fletcher A. Blackmon; DEPARTMENT OF THE NAVY WASHINGTON DC
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| An arbitrary waveform generator is capable of producing pulse or continuous waveform signals. It utilizes an EPROM that sends out selected stored digital signals under control of a microprocessor and auxiliary equipment comprised of a clock and an address sequencer. A digital-to-analog converter receives the digital signals from the EPROM and converts them to analog signals. |
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| Arbitrary Waveform Generator. |
13 APR 1992 |
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| Authors:
Fletcher A. Blackmon; DEPARTMENT OF THE NAVY WASHINGTON DC
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| It is a general purpose and object of the present invention to provide an arbitrary waveform generator. It is a further object that the generator has the ability to produce both pulse waveforms and continuous waveforms. Other objects are that the generator be compact and only require low power for lending itself to battery powered operation. These objects are accomplished with the present invention by providing a system in which ... |
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| Digital Calibration Circuit Employing Composite Sine Wave Signals. |
01 OCT 1991 |
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| Authors:
Fletcher A. Blackmon; Robert J. Reid; DEPARTMENT OF THE NAVY WASHINGTON DC
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| A digital calibration circuit provides 1/3 octave center frequencies substantially in the range of 50 Hz-12.5 kHz (25 tones) simultaneously at the output at repeatable levels. The system converts digital data to an analog representation for use in calibrating hydrophones. The calibration circuit is comprised of a clock section, a counting section, a clearing section, a data storage/-transfer section, and a signal conditioning section. The information that is provided to ... |
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