Accession Number : AD0747566

Title :   A Comparison of Immunity to Garbling for Three Candidate Modulating Schemes for DABS (Discrete Address Beacon System).

Descriptive Note : Project rept.,

Corporate Author : MASSACHUSETTS INST OF TECH LEXINGTON LINCOLN LAB

Personal Author(s) : Shnidman,D. A.

Report Date : 14 AUG 1972

Pagination or Media Count : 38

Abstract : The performance of three candidate modulation schemes for DABS is analyzed and a comparison on the basis of probability of error per bit is made. The three types of modulation are PAM, DPSK, and FSK. The results show that, at a given level of interference and signal-to-noise ratio, DPSK and FSK have a lower P sub e/bit than PAM and this difference is significant in most cases. In addition to P sub e/bit, however, the choice of modulation and message format depends on the capacity required, bandwidth occupancy, and cost of implementation. This list consideration is especially important with regard to the transponder. (Author)

Descriptors :   (*RADAR BEACONS, MODULATION), (*AIR TRAFFIC CONTROL SYSTEMS, RADAR BEACONS), ELECTROMAGNETIC COMPATIBILITY, PULSE AMPLITUDE MODULATION, RADIOFREQUENCY INTERFERENCE

Subject Categories : Air Navigation and Guidance

Distribution Statement : APPROVED FOR PUBLIC RELEASE