Pattern diversity in a microwave digital radio system utilizing

Details Pattern diversity in a microwave digital radio system utilizing Pattern diversity in a microwave digital radio system utilizing

1989-11-24

1991-02-19

Hille, Rolf

Communications: radio wave antennas

Antennas

Wave guide type

333 21R, 333113, 342361, 343756, H01Q 1300, H01Q 1900, H01P 116, H01P 512

Patent

active

049948199

ABSTRACT:
During multipath fading in a terrestrial digital radio system, off-axis arrival of signals excites higher-order modes in a horn reflector antenna. In the disclosed system specified ones of these higher-order modes and the fundamental mode are allowed to propagate in a main waveguide connected to the antenna. At least one of the higher-order modes is abstracted from the main waveguide and fed to a standby receiver while the fundamental mode is propagated intact to a main receiver.
Error occurrences in the fundamental and higher-order modes due to multipath fading are substantially uncorrelated. Hence, upon detecting an error in the signals delivered to the main receiver, the system switches to the standby receiver thereby to provide in a single-antenna a significant improvement in performance against multipath fading.

REFERENCES:
patent: 4112370 (1978-09-01), Monsen
patent: 4473828 (1984-09-01), Morz et al.
patent: 4769825 (1988-09-01), Vogel
patent: 4914443 (1990-04-01), Gans et al.
"Excitation of Higher-Order Antenna Modes by Multipath Propagation", E. T. Harkless et al., IEEE Trans. on Comm. Tech., vol. Com-15, No. 4, pp. 597-603, Aug. 1967.
"Multimode Corrugated Waveguide Feed for Monopulse Radar", P. J. B. Clarricoats et al., IEE Proc., vol. 128, Pt. H. No. 2, pp. 102-110, Apr. 1981.
"A Mode Extraction Network for RF Sensing in Satellite Reflector Antenna", B. K. Watson et al., Int. Conf. on Ant. and Prop., IEE Con. Pub. 195, pp. 323-327, Apr. 1981.

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