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US5491644A Expired / Lapsed US ⏱️ 0.0 years remaining

Cell engineering tool and methods

Assignee: Georgia Tech Research Corp
•
Filing: 1993-09-07
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Granted: 1996-02-13
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Expires: 2013-09-07
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Abstract

Abstract A cell engineering tool (10) evaluates wireless communications channels within and around architectural structures, such as buildings, in order to determine communications transfer characteristics, including the RMS signal power level and the complex-valued frequency-domain transfer function H(f) of the communications channel. In architecture, the CET (10) comprises a user interface (12) and an analysis engine (14) communicating with the user interface (12). The analysis engine (14) has a plurality of propagation models (16), which may be run concurrently for validation, if desired. Using the user interface (12), which is preferably a graphics mechanism, the user (18) inputs a floor plan, wall material parameters (conductivity, permittivity), and the location of a transmitter (53) and receiver (54) within the floor plan. The analysis engine (14) analyzes the input parameters and uses one or more of the propagation models (16) in order to derive a CET output. The propagation models (16) include an analytical model (26), a ray tracing model (27), and a statistical model (28). The analytical model (26) and the ray tracing model (27) are utilized to derive the transfer function H(f) and their respective results can be compared with each other for validation. Further, the statistical model (28) may be used to generate a rapid approximation of the RMS signal power loss or level.

Inventors

  • 👤 Leslie W. Pickering
  • 👤 Eric N. Barnhart
  • 👤 Bruce A. Harvey
  • 👤 Michael L. Witten

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-10-28 15:37
CPC Classifications
H; H04; H04W; H04W16/00; H04W16/18; Y; Y02; Y02D; Y02D30/00; Y02D30/70

Claims Analysis

Total Claims: 4
Claim 1
Independent Claim 122 words
A computer-based machine for determining wireless communications transfer characteristics between a transmitter location and a receiver location within and around an architectural structure based upon a floor plan of said architectural structure, material parameter and said transmitter and receiver locations, comprising: means for receiving inputs; means for determining from said inputs said floor plan of said architectural structure, said transmitter location and said receiver location within said floor plan, and respective relative permittivity and conductivity values of walls within said floor plan; means for determining said transfer characteristics for a communications channel between said transmitter and receiver locations by mathematically combining said transmitter location, said receiver location, said relative permittivity values, and said conductivity values; and means for displaying said transfer function.
Claim 2
Dependent Claim 122 words
A computer-based machine for determining wireless communications transfer characteristics between a transmitter location and a receiver location within and around an architectural structure based upon a floor plan of said architectural structure, material parameter and said transmitter and receiver locations, comprising: means for receiving inputs; means for determining from said inputs said floor plan of said architectural structure, said transmitter location and said receiver location within said floor plan, and respective relative permittivity and conductivity values of walls within said floor plan; means for determining said transfer characteristics for a communications channel between said transmitter and receiver locations by mathematically combining said transmitter location, said receiver location, said relative permittivity values, and said conductivity values; and means for displaying said transfer function.
Claim 3
Dependent Claim 127 words
A computer-based cellular engineering tool for determining wireless communications transfer characteristics between a transmitter location and receiver location within and around an architectural structure from architectural data, wall material parameters, and said transmitter and receiver locations, comprising: user interface means for receiving input data and for displaying said transfer characteristics; means for determining from said inputs a floor plan, said transmitter location and said receiver location within said floor plan, with respect to relative permittivity and conductivity values of walls within said floor plan; and analysis means for determining a transfer characteristic for a communication channel between said transmitter and receiver locations by mathematically combining said transmitter location, said receiver location, said relative permittivity values and said conductivity values; and means for graphically displaying said transfer characteristic.
Claim 4
Dependent Claim 127 words
A computer-based cellular engineering tool for determining wireless communications transfer characteristics between a transmitter location and receiver location within and around an architectural structure from architectural data, wall material parameters, and said transmitter and receiver locations, comprising: user interface means for receiving input data and for displaying said transfer characteristics; means for determining from said inputs a floor plan, said transmitter location and said receiver location within said floor plan, with respect to relative permittivity and conductivity values of walls within said floor plan; and analysis means for determining a transfer characteristic for a communication channel between said transmitter and receiver locations by mathematically combining said transmitter location, said receiver location, said relative permittivity values and said conductivity values; and means for graphically displaying said transfer characteristic.

References Cited (Backward Citations)

US4648124A Cited
US4747101A Cited
US5276277A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1999-02-12 1999-08-14 2000-02-13 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 2003-02-12 2003-08-14 2004-02-13 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 2007-02-12 2007-08-14 2008-02-13 $7700.00 Window Closed / Lapsed

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