James A. Hoffmeyer; Timothy J. Riley


This report describes the results of an 18-month digital microwave radio performance and propagation measurement project that was conducted on a portion of the Defense Communications System in Germany. More than 6 gigabytes of data were collected between April 1988 and October 1989. , The collected data include end-to-end (user-to-user) performance data, radio performance and propagation data on one line-of-sight and one troposcatter link, and meteorological data. The end-to-end measurements are referred to as the Network Performance Characterization (NPC) data, and consist of error performance measurements on two separate 64 kb/s channe:j.s consisting of tandem terrestrial microwave links. The radio performance and propagation measurements are referred to as the Link Performance Characterization (LPC) data. These data consist of digital radio performanc.e and propagation measurements made on a long ) 99-km) line-of-sight microwave link. The propagation measurements on this link include multipath delay spread, in-band power difference (IBPD), and receive signal level (rsl) measurements.

The report provides summaries of the long-term statistics of both radio performance and propagation data. The performance data are compared with both CCITT and Military Standard (MIL-STD) performance criteria. The propagation data are used in the assessment of the causes of digital radio outages. The propagation data re also useful for a variety of modeling purposes. These applications of the propagation data are described in the report.

Keywords: multipath fading; propagation measurements; CCITT; DEB; Digital European Backbone; DRAMA; digital radio performance; LOS propagation; radio outages; transmission system performance standards; troposcatter; digital microwave radio; IBPD; in-band dispersion; linear amplitude difference; MIL-STD

Disclaimer: Certain commercial equipment, components, and software may be identified in this report to specify adequately the technical aspects of the reported results. In no case does such identification imply recommendation or endorsement by the National Telecommunications and Information Administration, nor does it imply that the equipment or software identified is necessarily the best available for the particular application or uses.

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