A Comparison of Immunity to Garbling for Three Candidate Modulating Schemes for DABS (Discrete Address Beacon System).
MASSACHUSETTS INST OF TECH LEXINGTON LINCOLN LAB
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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 ebit than PAM and this difference is significant in most cases. In addition to P sub ebit, 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
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