STUDY AND APPLICATION OF ADAPTIVE COMMUNICATION TECHNIQUES IN THE DEFENSE COMMUNICATION SYSTEM.
Interim rept. no. 1, 5 Mar-5 Jul 64.
RADIO CORP OF AMERICA NEW YORK DEFENSE ELECTRONIC PRODUCTS
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This is a first report on a study of adaptive techniques for use in submarine cable, HF, and land-line digital links of the DCS for the period 1970-1975. The overall objective is to devise adaptive data systems which maintain a desired quality of transmission in terms of bit-error-rate under variable conditions of transmission at given, fixed input bit-rates. Of particular concern are input data rates of 2.4 kb in channels of 3 to 4 kc width, and 38.4 kb in a 48 kc channel with a nominal goal of 0.000001 bit-error-rate over a 12,000 n.m. circuit. The study is directed to adaptive control of the data channel in distinction to control of the data source. It is desired that the channel be transparent to the user of the system in the sense that data can be applied and received continuously at the given, fixed bit-rate. In essence, adaptive modems are being sought, - this is to say data modems augmented by channel monitoring and control sub-systems which regulate the mode of transmission and means of detection. This report covers the study of the submarine cable and related work.