Prediction of indoor electromagnetic wave propagation for wireless indoor systems
Patent 5450615 Issued on September 12, 1995. Estimated Expiration Date: 
December 22, 2013. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
December 22, 2013. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent ReferencesStructure for wireless communication in an electromagnetically shielded building High speed method for predicting radio-wave propagation Method and system for inferring the radio refractive index structure of the atmosphere from radio measurements Patent #: 5327359 Inventors
AssigneeApplicationNo. 172009 filed on 12/22/1993US Classes:455/67.16, Phase measuring (e.g., group delay, propagation effect, etc.)455/504, Fading compensation702/159By reflected signal (e.g., ultrasonic, light, laser)ExaminersPrimary: Urban, Edward F.Attorney, Agent or FirmInternational ClassH04B 017/00AbstractTechniques are disclosed for predicting RF propagation within a structure such as a building. A reference transmitter location and a plurality of reference receiver locations are selected. For each reference receiver location, RF propagation pathways are determined with respect to the reference transmitter location. The RF propagation pathways include a direct path joining the reference transmitter location to a given reference receiver location across a straight-line path, as well as one or more reflection paths joining the reference transmitter location to a given reference receiver location via reflections from one or more reflective surfaces. One or more propagation pathways may pass through an RF obstacle, such as, for example, a lossy dielectric material. Each reflective surface and RF obstacle is associated with a reflection coefficient and a transmission coefficient. These coefficients are computed for each object and surface from a multilayer dielectric model, maintaining angle and polarization dependencies. For each propagation pathway, a propagation component consisting of the propagation loss relative to free-space propagation is calculated as the product of the magnitude squared of the reflection and transmission coefficients. The local mean of received RF power at each of the reference receiver locations is calculated as the scalar sum of the powers of all the propagation pathway components reaching the specified location.Other References
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