Accession Number:

ADA010004

Title:

Equivalence Measurement Studies (Sections 1 - 4)

Descriptive Note:

Final rept. Apr 1973-May 1974

Corporate Author:

CNR INC NEEDHAM MA

Personal Author(s):

• Bello, Phillip A.
• Jankauskas, Louis A.
• Pickering, Leslie W.

Report Date:

1975-04-01

Pagination or Media Count:

371.0

Abstract:

The report describes the results of an investigation concerned with developing and evaluating concepts for channel quality monitoring of advanced digital data transmission techniques over four fading dispersive channels of interest to military communications the line-of-sight ground point-to-point microwave relay, troposcatter, satellite ionospheric scintillation, and high-frequency long haul channels. The study emphasis is on a monitoring subsystem called the Media Quality Unit MQU which continually estimates long- and short-term error rates for a nondegraded receiver and by comparison with actual error rate as measured by a Performance Monitor Unit PMU allows estimation of receiver degradation trends and classification of outages into receiver-, media, or interference-caused. Major effort was devoted to development and analysis of MQU techniques which use the received information-bearing signal alone as a source of channel information since continuous one-line operation is possible and no special probing signals are required.

Descriptors:

• *DATA TRANSMISSION SYSTEMS
• *MULTICHANNEL COMMUNICATIONS
• *PULSE COMMUNICATIONS
• LINE OF SIGHT
• HIGH FREQUENCY
• MONITORING
• ERRORS
• SATELLITE COMMUNICATIONS
• RADIO LINKS
• MICROWAVE RELAY SYSTEMS
• TROPOSPHERIC SCATTER COMMUNICATIONS

Subject Categories:

• Radio Communications

Distribution Statement:

APPROVED FOR PUBLIC RELEASE