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Methods for accurate use of finite dynamic range measurement data in radio path loss propagation model calibration

a propagation model and dynamic range measurement technology, applied in the field of calibration of data parameter sets, can solve the problems of inability to give the best prediction possible, inability to accurately calibrate the propagation model, and inability to accurately predict the propagation model

Inactive Publication Date: 2010-04-08
NEWFIELD WIRELESS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0012]The invention consists of approaches to calibrating propagation models that removes the bias inherent in using data that is of limited dynamic range. It also covers means of implementing these methods in software.

Problems solved by technology

This generally introduces bias into the measurement data set.
Models created by OLS fit to the data may therefore be biased and will not give the best prediction possible.
Additionally, a propagation model is usually more complicated than the simple linear fits shown in FIGS. 1 and 2, and will incorporate diffraction and clutter effects among others, as well as antenna discrimination where appropriate.

Method used

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  • Methods for accurate use of finite dynamic range measurement data in radio path loss propagation model calibration
  • Methods for accurate use of finite dynamic range measurement data in radio path loss propagation model calibration
  • Methods for accurate use of finite dynamic range measurement data in radio path loss propagation model calibration

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Embodiment Construction

[0022]CW measurements can be treated as truncated data by using the signal sensitivity threshold as the lower truncation level, and the top end of the receiver linear range as the upper truncation level. Any observations outside these limits are excluded from the data set. FIG. 3 shows a flow diagram of this process.

[0023]Scanner data can be treated as truncated data by excluding measurements above the linear range or below the receiver sensitivity. The sensitivity limit for scanner data differs from the limit for CW data in that, for scanner data, the sensitivity is often limited by interference. Therefore the lower truncation levels are determined from the interference level measured at each data point. The lower truncation level at a point in the case of CDMA or UMTS is the measured value of I0 (in dBm) at a point plus the minimum Ec / I0 (in dB) that the scanner can reliably measure. For the case of GSM data, the lower truncation level is the measured value of I (in dBm) at a poin...

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Abstract

Methods for accurately predicting radio propagation from signal strength measurements. Dynamic range limitations in the measurement data are explicitly taken into account. The resulting propagation models accurately predict signal strength for calculation of coverage and interference.

Description

CLAIM OF PRIORITY[0001]This application is a continuation of U.S. patent application Ser. No. 11 / 372,154 entitled “Methods for Accurate Use of Finite Dynamic Range Measurement Data in Radio Path Loss Propagation Model Calibration”, by Nathan Hunt et al., filed Mar. 9, 2006, which claims priority to U.S. Provisional Patent Application No. 60 / 661,128 entitled “Methods for Accurate Use of Finite Dynamic Range Measurement Data in Radio Path Loss Propagation Model Calibration”, by Nathan Hunt et al., filed Mar. 11, 2005.COPYRIGHT NOTICE[0002]A portion of the disclosure of this patent document contains material that is subject to copyright protection. The copyright owner has no objection to the facsimile reproduction by anyone of the patent document or the patent disclosure, as it appears in the U.S. Patent and Trademark Office patent file or records, but otherwise reserves all copyright rights whatsoever.FIELD OF THE INVENTION[0003]This invention relates to the field of calibrating data ...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): G06F17/10
CPCH04W16/18G06F11/261H04B17/3913G06F17/50G06F13/105G06F30/00
Inventor HUNT, NATHANBENSADOUN, MARC
Owner NEWFIELD WIRELESS