Accession Number:

ADA055269

Title:

Broadband Modem II

Descriptive Note:

Final technical rept.

Corporate Author:

HARRIS CORP MELBOURNE FL GOVERNMENT ELECTRONIC SYSTEMS DIV

Report Date:

1978-04-01

Pagination or Media Count:

162.0

Abstract:

The objective of this program was to optimize the techniques developed on the previous contract Contract F30602-74-C-0263 from a cost and performance point of view and to implement an experimental modem suitable for extended test at RADC providing bandwidth efficient signalling for the line-of- sight microwave system. Specifically, spectral efficiency compliant with FCC Docket 19311 was required. A bit error rate of 5 x 10 to the minus ninth power at an EbNo of 22 dB for two bitshertz of RF bandwidth operation or at an EbNo of 16 dB for one bithertz of RF bandwidth operation was desired. An experimental modem was constructed and successfully tested, both in the laboratory and at RADC. All design requirements were met. Most notably, the performance goal of emission requirements as described in FCC Docket 19311 was met. The acquisition performance objective of 20 ms for a frequency off-set of 20 kHz was met, as was the performance objective of 5 x 10 to the minus ninth power bit error rate at an EbNo of 16 dB for one bithertz operation. The design objective of a 5 x 10 to the minus ninth power bit error rate at an EbNo of 22 dB for two bitshertz operation was exceeded in back-to-back tests and was within 0.6 dB for a group-delay compensated LC8D radio. Author

Subject Categories:

  • Electrical and Electronic Equipment
  • Cybernetics
  • Radio Communications

Distribution Statement:

APPROVED FOR PUBLIC RELEASE