Digital Coding for underwater Acoustic Multipath Channels.
Abstract
Low data rate, multipath propagation, input energy constraints and other considerations make it difficult to transfer conventional radio communications practice to long range (one to five megameter) underwater acoustic multipath channel telemetry. The energy channel capacity CJ in bits/joule, for any waveform channel with well-defined capacity C bits/sec at signal power S watts, is defined as C/S bits/joule. It is shown that for several coherent channels, the supremum of CJ over S is approached as S approaches zero. This implies that the communication system that obtains high channel rate in bits/joule operates at low received signal-to-noise power ratio, S/N. High signal-to-noise energy ratio E/NO and good error performance is achieved by using long codewords. A binary symmetric channel and a waveform distorting channel with Gaussian noise of known power spectral density are considered.
Document Details
- Document Type
- Technical Report
- Publication Date
- Dec 01, 1984
- Accession Number
- ADA157170
Entities
People
- H. Kwon
Organizations
- University of Michigan