Channel capacity in bits per joule

Underwater acoustic telemetry has a total input energy constraint, since the energy is stored in the transmitter's batteries. This work is primarily rephrasing the work in channel capacity in terms of C_{J} bit/J as compared to C bit/s, to emphasize the energy efficiency and to deemphasize the...

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Bibliographic Details
Published in:IEEE journal of oceanic engineering 1986-01, Vol.11 (1), p.97-99
Main Authors: Hyuck Kwon, Birdsall, T.
Format: Article
Language:English
Subjects:
Batteries
Channel capacity
Energy efficiency
Frequency shift keying
Optical distortion
Optical modulation
Optical noise
Optical transmitters
Pulse modulation
Telemetry
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Summary:Underwater acoustic telemetry has a total input energy constraint, since the energy is stored in the transmitter's batteries. This work is primarily rephrasing the work in channel capacity in terms of C_{J} bit/J as compared to C bit/s, to emphasize the energy efficiency and to deemphasize the speed of the telemetry. The energy channel capacity C_{J} , for any waveform channel with well-defined capacity C bit/s at signal power S watts, is defined as C/S bit/J. It is shown that for coherent binary frequency shift keying (BFSK) and waveform channels, the supremum of C_{J} over S is approached as S approaches zero. For the Gaussian channel the best coding uses narrow bands with the highest S/N.
ISSN:0364-9059
1558-1691
DOI:10.1109/JOE.1986.1145138