Method of determining effect of radio wave multipath fading
AssigneeNokia Telecommunications Oy
InventorKari Sipilä
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Abstract
The invention relates to a method of determining the average effect of radio wave multipath fading in a desired area in a radio system. The desired area of a coverage area of a base station in the system is described by a digital map. The average effect of multipath fading of a transmitter output is determined in different sub-areas of the desired area. In order to reduce the computation amount signal fading parameters are determined at some point of each sub-area by a ray tracing method and the average effect of signal multipath fading in the sub-area is calculated using said parameters.
Claims5
A method of determining the average effect of radio wave multi-path fading in a desired area in a radio system, comprising:
- using an at least a two-dimensional digital map to describe the desired area of a covering area of a base station in the system;
- and
- determining the average effect of multipath fading of a transmitter output in different sub-areas of the desired area, wherein
- determining signal fading values at only a single point of each sub-area by a ray tracing method,
- setting parameters of a given empirical formula using the values obtained using ray tracing calculations on the respective single point of each sub-area, and
- calculating the average effect of signal multipath fading in the sub-area surrounding the single point using the empirical formula.
Dependencies are inferred from the claim text.