Accession Number:

ADA142226

Title:

Adaptive Techniques for Troposcatter

Descriptive Note:

Final technical rept. Nov 1982-Sep 1983

Corporate Author:

SIGNATRON INC LEXINGTON MA

Personal Author(s):

• Wallace, Mark S.
• Parl, Steen A.
• Malaga, Alfonso
• Pierce, John N.

Report Date:

1984-02-01

Pagination or Media Count:

283.0

Abstract:

This report examines the performance of phased array antennas with adaptive combining for troposcatter communications. Diversity is commonly employed to combat fading on troposcatter links. Diversity may be derived from a phased array by adaptive combining of the element outputs space diversity or equivalently by forming a set of beams via a Butler matrix transformation angle diversity. A number of new results describing the performance of both azimuth and elevation angle diversity systems using phased arrays are derived and performance bounds for both azimuth and elevation diversity are found. A new class of sub-optimal combiners is examined. The effect of implicit diversity on wideband systems is considered. The degradation due to channel measurement errors is also determined. A measurement program is proposed to verify the results. The computer program which performs the common volume integration is described.

Descriptors:

• *TROPOSPHERIC SCATTER COMMUNICATIONS
• *PHASED ARRAYS
• *ADAPTIVE SYSTEMS
• *ANTENNA ARRAYS
• *SPACE DIVERSITY COMMUNICATIONS
• CHANNELS
• BROADBAND
• ERRORS
• MEASUREMENT
• COMPUTER PROGRAMS
• ELEVATION

Subject Categories:

• Non-Radio Communications

Distribution Statement:

APPROVED FOR PUBLIC RELEASE