Mitigation of effects of multiple path nulls at super-high frequencies through diversity and networking
Abstract
The goal of this work is to investigate the design issues implied by multipath effects for a high bandwidth communication network consisting of platforms in a Navy battle group. This communication network is designed to operate using super-high frequency (SHF) or ultra-high frequency (UHF) line-of-sight (LOS) propagation, and must be robust to variations in link quality due to platform motion or deletion, as well as to the effects of multipath propagation. High bandwidth in this context implies data rate in excess of 1.544 megabits per second (Mbps), known as 'TI' in the commercial world. Multipath nulls at the above frequencies can render links useless at certain ranges. In this work, we briefly discuss the well-known methods of height and frequency diversity, as well as a less frequently used but potentially powerful method of 'path diversity' through networking, to alleviate the ill effects of multipath nulls. The communication system configurations discussed are appropriate for expected platform separations in post-Cold War battle group scenarios, which envision most platforms within line-of-sight (LOS) distance from each other, i.e., separated by no more than about 20 nautical miles (nmi).
- Publication:
-
In AGARD
- Pub Date:
- July 1994
- Bibcode:
- 1994mmpp.agarQ....D
- Keywords:
-
- Bandwidth;
- Communication Networks;
- Deletion;
- Multipath Transmission;
- Superhigh Frequencies;
- Ultrahigh Frequencies;
- Frequency Shift;
- Line Of Sight;
- Rates (Per Time);
- Reception Diversity;
- Systems Engineering;
- Warfare;
- Communications and Radar