Accession Number : AD0655372

Title :   FREQUENCY PROGRAMMER AND DECODER.

Descriptive Note : Final technical rept. Jan 66-Jan 67,

Corporate Author : ROME AIR DEVELOPMENT CENTER GRIFFISS AFB N Y

Personal Author(s) : Kobos,Alfred S.

Report Date : JUN 1967

Pagination or Media Count : 42

Abstract : A technique for encoding 5 information bits into an eight-frequency symbol was implemented and tested. Data at a 62.5 kilobit/second rate is converted into output frequencies each of which is 2 microseconds in duration. Approximately 10 MHz of bandwidth is required for transmission. The performance of this system was determined in the laboratory, using additive gaussian noise for a channel. Error probabilities were measured for the binary data. The experimental results are compared to the theoretical performance of a noncoherent detector for M-ary signals. A brief discussion of the equations used to obtain the theoretical curves is presented. The encoding process is described in detail and the decision process employed is shown to be less efficient than the optimum possible one. The relationship of the binary error rate to the 32-ary symbol error rate is described. (Author)

Descriptors :   (*COMPUTER PROGRAMMING, *DECODING), PULSES, BANDWIDTH, THEORY, PROBABILITY, ERRORS, DETECTION, FREQUENCY, EQUATIONS, PERFORMANCE(ENGINEERING), CODING

Subject Categories : Computer Programming and Software

Distribution Statement : APPROVED FOR PUBLIC RELEASE