Ed Arthurs

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A set of stations wish to transmit messages to one another over a shared link. Messages are generated either according to so called <italic>finite source</italic> or <italic>infinite source</italic> arrival statistics. The message lengths are independent identically distributed random variables. Two policies for arbitrating contention are compared:(More)
00 00 u(t-T/2) u (t + T/2) exp(-jwt) dt was introduced by Ville (1), and its significance with respect to the quality of radar measurements was suggested by Woodward (2), and enlarged upon by Siebert (3). For some time we have been studying the mathematical properties of this function-with the hope of ultimately devising the necessary and sufficient(More)
  • E Arthurs, T J M S Wozencraft, +29 authors P P I
  • 2009
The digital techniques that were illustrated in earlier reports (1, 2, 3,4) have been used to determine upper bounds on the amount of information necessary for specifying pictures (5). The picture plane was divided into strips, each of which contained five scanning lines (see Fig. IX-1). The three initial samples A, B, and C that were used for each strip(More)
  • E Arthurs, F J M Wozencraft, +22 authors Huang
  • 2009
This group continues its investigations of sources that generate information, channels that transmit it, and machines that process it. For sources, the main objective is to estimate the rate at which they generate information and to determine how to encode their output economically, in order to decrease the channel capacity required for transmission.(More)
Several authors have described various methods of picture coding with the object of reducing the information required to specify a picture (1-5). By using quite sophisticated schemes they succeeded in reducing the information from 6 bits/sample to 1-2 bits/sample and obtained reasonably good processed pictures. Two questions (6) were raised by their work:(More)
In other work (1, 2) it has been shown that channel estimating filters play an important role in optimum receivers for linear time-variant channels. In this report we discuss these filters in greater detail, chiefly to supplement later discussions of receivers. The relation between minimum variance and maximum likelihood estimates is shown, even in the case(More)