Title:
METHOD OF AND APPARATUS FOR ESTIMATING WAVE PROPAGATION LOSS
Document Type and Number:
Japanese Patent JP3208084
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To provide a method and an apparatus for estimating a wave propaga tion loss whereby a highly accurate estimation is carried out.
SOLUTION: In a learning process, a central value calculation part 3 forms a central value sequence data. A multilayer neural network process part 6 is formed of, e.g. three artificial neural networks, and constituted so that an output value sequence of a plurality of output nodes corresponds to a central value sequence of propagation loss values at a plurality of detection points. An output node count determination process part 4 sets an output node count to correspond equally to a segment distance when a central value is calculated. The learning process is conducted with using a distance from a transmission station and a propagation condition value as input, data and the central value sequence data as teacher's data. At the estimation time, a required propagation condition value and a required distance from the transmission station are input to the artificial neural network after learning, so that an estimation value of the central value of the propagation loss is obtained.
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Inventors:
Yuya Masui
Application Number:
JP6178297A
Publication Date:
September 10, 2001
Filing Date:
February 28, 1997
Export Citation:
Assignee:
WRP Mobile Communication Technology Laboratory
International Classes:
G01R29/08; H04B17/00; H04B17/318; H04B17/391; (IPC1-7): G01R29/08; H04B17/00
Other References:
ＩＥＥ Ｐｒｏｃｅｅｄｉｎｇｓ Ｐａｒｔ Ｈ（Ｍｉｃｒｏｗａｖｅｓ，Ａｎｔｅｎｎａｓ Ａｎｄ Ｐｒｏｐａｇａｔｉｏｎ）Ｖｏｌ．１４０，Ｎｏ．４，ｐｐ．３１５−３２０，１９９３
Attorney, Agent or Firm:
Hideo Takahashi (2 outside)