Long-Term Performance and Propagation Measurements on Single and Tandem DigitalMicrowave Transmission Links. Volume 3. Twelve-Month Network and Link-Characterization Results

摘要

The report describes the results of an 18-month digital microwave radioperformance 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 channels 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 performance 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 are also useful for a variety of modeling purposes. These applications of the propagation data are described in the report.