Telecommunications – Transmitter and receiver at separate stations – Single message via plural carrier wave transmission
Patent
1993-06-03
1995-04-25
Urban, Edward F.
Telecommunications
Transmitter and receiver at separate stations
Single message via plural carrier wave transmission
455 331, 455 561, 455 674, H04B 726, H04B 1700, H04Q 702
Patent
active
054107369
ABSTRACT:
A method for conducting radio transmission systems interference studies based on the prior art two-step process of conducting a simple analysis on all potentially interfering systems to eliminate those clearly not causing interference into radio receiver under study, and then conducting a detailed analysis on the remaining systems. The new method replaces the first step in the prior art system with a method using pre-calculated average terrain elevations over a geographic block for determining whether the loss should be calculated using a smooth terrain calculation method with a simulated single knife edge diffraction obstacle in the path, or a rough terrain calculation method that substitutes a pre-calculated block roughness factor in place of the path roughness factor, and then also substitutes a new effective antenna height for the actual antenna height in the propagation loss calculations.
REFERENCES:
patent: 4346385 (1982-08-01), Schiavone et al.
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McGrane, A. R., "A Microwave Propagation Prediction Tool, MPT, and its Performance in Practice", Nov. 16, 1990, IEE Colloquium on `Diffraction Propagation Modelling Techniques Embracing Surface Feature Data`, all pages.
Lebherz, M., "Features of 3D VHF/UHF Propagation Channel Modelling", Apr. 15-18, 1991, Seventh International Conference on Antennas and Propagation ICAP 91, pp. 976-979.
Craig, K. H., "Numercial Modelling of Propagation Effects", IEE Colloquium on `National Radio Propagation Programme`, Jan. 8, 1991, pp. 5/1-5/3.
AD-687-820, "Transmission Loss Predictions for Tropospheric Communication Circuits" vol. I, Technical Note 101, P. L. Rice, A. G. Longley, K. A. Norton and A. P. Barsis. 1967.
AD-687-821, "Transmission Loss Predictions for Tropospheric Communication Circuits", vol. II, Technical Note 101, P. L. Rice, A. G. Longley, K. A. Norton and A. P. Barsis, 1967.
Bell Communications Research Inc.
Giordano Joseph
Suchyta Leonard Charles
Urban Edward F.
Wisler Mark D.
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