Accession Number : ADA295606

Title :   Bispectrum Modulation for Jamming Rejection on Satellite Communication Channels.

Descriptive Note : Final technical rept.,

Corporate Author : NEOTERIC TECHNOLOGIES INC CINCINNATI OH

Personal Author(s) : Barton, Richard J.

PDF Url : ADA295606

Report Date : 12 MAY 1995

Pagination or Media Count : 23

Abstract : The Global Grid communications environment is designed to provide a high-data-rate network that supports the full complement of DoD communications needs. Satellite links are an integral part of the Global Grid concept which extends the connectivity to individual mobile units and jointly operating forces at isolated locations. However, satellite channels are vulnerable to jamming, in particular when a high data rate is required. To overcome the jamming problem, the traditional approach is to design modulation techniques such that, on the average, the spectrum of the signal looks like the spectrum of a white noise process. This together with channel coding provides immunity against jamming. The main problem with this approach is that it requires a much larger spectrum than that of the data sequence; hence, the available spectrum on the link is used mostly for jamming protection and not for data communications. The traditional modulation techniques employed on satellite communication links are based on various properties of the second-order spectrum of the modulation wave form. In this study we have explored the utility and performance of a new family of modulation schemes that exploit the properties of the higher-order cumulant sequences and associated polyspectra of the waveform. In particular, we have investigated an approach in which the third-order polyspectrum, which is generally referred to as the bispectrum, is modulated. To determine the performance characteristics of this bispectral modulation scheme, we have considered two different detector structures, for which we have completed both theoretical and simulated performance analyses. (KAR) P. 2

Descriptors :   *SATELLITE COMMUNICATIONS, *MODULATION, *DATA LINKS, *ANTIJAMMING, *CHANNELS, SIMULATION, GLOBAL, ENVIRONMENTS, DETECTORS, HIGH RATE, DATA TRANSMISSION SYSTEMS, PERFORMANCE TESTS, THEORY, VULNERABILITY, GRIDS, WHITE NOISE, SEQUENCES, CODING, SPECTRA, SIGNALS, MOBILE, COMMUNICATIONS NETWORKS, ARTIFICIAL SATELLITES, JAMMING, COMMUNICATION AND RADIO SYSTEMS, DATA RATE, IMMUNITY, WAVES, REJECTION.

Subject Categories : Countermeasures
      Radio Communications

Distribution Statement : APPROVED FOR PUBLIC RELEASE