Broadband Modem II
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 Eb/No of 22 dB for two bits/hertz of RF bandwidth operation or at an Eb/No of 16 dB for one bit/hertz 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 Eb/No of 16 dB for one bit/hertz operation. The design objective of a 5 x 10 to the minus ninth power bit error rate at an Eb/No of 22 dB for two bits/hertz operation was exceeded in back-to-back tests and was within 0.6 dB for a group-delay compensated LC8D radio. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Apr 01, 1978
- Accession Number
- ADA055269
Entities
People
- Bruce E. Gillingham
- Robert C. Davis
Organizations
- Harris Corporation