Kwon and Birdsall : Digital Waveform Codings for Ocean
نویسنده
چکیده
A bstract-M-sequence waveform coding with a single long codeword has been considered as the basis for long-range underwater acoustic telemetry, for one user. (An m-sequence is a periodic, binary, linear-law maximal-length sequence. If the span of the law in n, the maximal length L = 2” 1.) For a given law, a single m-sequence transmits a maximum of log,(L) bits of source information per channel word. To increase the number of bits per word, families of m-sequences and Gold codes are considered, and compared to a single m-sequence. A hypothetical idealized multipath channel with added white Gaussian noise is assumed. Coding using families of m-sequences is recommended because it requires a smaller bit-energy-to-noise ratio than other waveform codes to achieve an equivalent codeword error probability.
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