Apparatus for improved underwater acoustic telemetry utilizing p

Details Apparatus for improved underwater acoustic telemetry utilizing p Apparatus for improved underwater acoustic telemetry utilizing p

1992-08-05

1994-04-05

Pihulic, Daniel T.

Communications, electrical: acoustic wave systems and devices

Underwater system

Telemetering

H04B 1100

Patent

active

053011678

ABSTRACT:
An underwater acoustic communications system utilizes phase coherent modulation and demodulation in which high data rates are achieved through the use of rapid Doppler removal, a specialized sample timing control technique and decision feedback equalization including feedforward and feedback equalizers. The combined use of these techniques drammatically increases data rates by one and sometimes two orders of magnitude over traditional FSK systems by sucessfully combating fading and multipath problems associated with a rapidly changing underwater acoustic channel that produce intersymbol interference and make timing optimization for the sampling of incomming data impossible.

REFERENCES:
patent: 5029147 (1991-07-01), Andrews et al.
McGraw-Hill Encyclopedia of Science & Technology, 1982, pp. 644-647.

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