Indoor environment design system, indoor environment evaluation system, indoor environment design method, and indoor environment evaluation method

• US 6,687,650 B2
• Filed: 06/05/2001
• Issued: 02/03/2004
• Est. Priority Date: 06/05/2000
• Status: Active Grant

• Current Assignee: Nitto Boseki Company Limited
• Original Assignee: Nitto Boseki Company Limited
• Inventors: Hatanaka, Hideyuki, Ohtsubo, Masato, Arikawa, Sadaaki
• Primary Examiner(s): Hoff, Marc S.
• Assistant Examiner(s): O MALLEY, MARY CATHERINE
• Application Number:
  US09/873,443
• Publication Number:
  US 20020023244A1
• Time in Patent Office: 973 Days
• Field of Search: 702/57, 702/65-66, 702/69, 702/124, 702/126, 702/182, 702/189, 455/456.1, 455/456.2, 455/456.4, 455/575.1, 455/575.8, 455/115--11, 455/226.1, 455/300-301, 455/347, 455/349, 174/35.MS, 307/91
• US Class Current: 702/182
• CPC Class Codes: G01R 29/0821 rooms and test sites therefor, e.g. anechoic chambers, open field sites or TEM cells for testing antennas G01R29/105
• CPC Class Codes: H04W 16/20 for indoor coverage or short range network deployment
• CPC Class Codes: H04W 16/225 for indoor or short range network

Abstract

An indoor environment design system 10 is composed of a target communication quality input section 12 for inputting a target communication quality of radio communication in a room, a signal propagation property calculation section 14 for calculating a delay spread in the room for implementation of the target communication quality, a signal propagation property conversion section 16 for converting the delay spread in the room thus calculated, to a delay spread in a laboratory, and an indoor environment design section 18 for designing an environment in the room for radio communication, based on the delay spread in the laboratory thus converted and on a relation between delay spreads in the laboratory and environments in the laboratory for implementation of the delay spreads in the laboratory, which is preliminarily obtained experimentally.

Claims

1. An indoor environment design system for designing an environment in a room for radio communication, which comprises:

target communication quality input means for inputting a target communication quality of said radio communication in said room;

first signal propagation property calculation means for calculating a signal propagation property in said room for implementation of said target communication quality, based on said target communication quality inputted by said target communication quality input means;

first signal propagation property conversion means for converting the signal propagation property in said room calculated by said first signal propagation property calculation means, to a signal propagation property in a laboratory of a specific size; and

indoor environment design means for designing the environment in said room, based on the signal propagation property in said laboratory converted by said first signal propagation property conversion means and on a relation between signal propagation properties in the laboratory and environments in said laboratory for implementation of the signal propagation properties in said laboratory, which is preliminarily obtained experimentally;

wherein said first signal propagation property conversion means converts the signal propagation property in said room to the signal propagation property in said laboratory, based on comparison between a size of a space in said room and a size of a space in said laboratory.

2. The indoor environment design system according to claim 1, wherein the signal propagation property in said room is a delay spread during radio communication in said room, and

wherein the signal propagation property in said laboratory is a delay spread during radio communication in said laboratory.

3. The indoor environment design system according to claim 1, wherein the environment in said room is a layout pattern of electromagnetic wave absorbing surfaces or electromagnetic wave reflecting surfaces in said room, and

wherein the environments in said laboratory are layout patterns of electromagnetic wave absorbing surfaces or electromagnetic wave reflecting surfaces in said laboratory.

4. An indoor environment evaluation system for evaluating an environment in a room for radio communication, which comprises:

indoor environment input means for inputting the environment in said room;

second signal propagation property calculation means for calculating a signal propagation property in a laboratory of an environment corresponding to the environment in said room inputted by said indoor environment input means, based on a relation between environments in the laboratory of a specific size and signal propagation properties in said laboratory, which is preliminarily obtained experimentally;

second signal propagation property conversion means for converting the signal propagation property in said laboratory calculated by said second signal propagation property calculation means, to a signal propagation property in said room; and

indoor environment evaluation means for evaluating the environment in said room for said radio communication, based on the signal propagation property in said room converted by said second signal propagation property conversion means;

wherein said second signal Propagation property conversion means converts the signal propagation property in said laboratory to the signal propagation property in said room, based on comparison between a size of a space in said room and a size of a space in said laboratory.

5. The indoor environment evaluation system according to claim 4, wherein the signal propagation property in said room is a delay spread during radio communication in said room, and

wherein the signal propagation property in said laboratory is a delay spread during radio communication in said laboratory.

6. The indoor environment evaluation system according to claim 4, wherein the environment in said room is a layout pattern of electromagnetic wave absorbing surfaces or electromagnetic wave reflecting surfaces in said room, and

wherein the environments in said laboratory are layout patterns of electromagnetic wave absorbing surfaces or electromagnetic wave reflecting surfaces in said laboratory.

7. The indoor environment evaluation system according to claim 4, wherein said indoor environment evaluation means evaluates the environment in said room by calculating a communication quality implementable in said room.

8. An indoor environment design method of designing an environment in a room for radio communication, which comprises:

a target communication quality input step of inputting a target communication quality of said radio communication in said room;

a first signal propagation property calculation step of calculating a signal propagation property in said room for implementation of said target communication quality, based on said target communication quality inputted in said target communication quality input step;

a first signal propagation property conversion step of converting the signal propagation property in said room calculated in said first signal propagation property calculation step, to a signal propagation property in a laboratory of a specific size; and

an indoor environment design step of designing the environment in said room, based on the signal propagation property in said laboratory converted in said first signal propagation property conversion step and on a relation between signal propagation properties in the laboratory and environments in said laboratory for implementation of the signal propagation properties in said laboratory, which is preliminarily obtained experimentally;

wherein said first signal propagation property conversion step comprises a step of converting the signal propagation property in said room to the signal propagation property in said laboratory, based on comparison between a size of a space in said room and a size of a space in said laboratory.

9. The indoor environment design method according to claim 8, wherein the signal propagation property in said room is a delay spread during radio communication in said room, and

wherein the signal propagation property in said laboratory is a delay spread during radio communication in said laboratory.

10. The indoor environment design method according to claim 8, wherein the environment in said room is a layout pattern of electromagnetic wave absorbing surfaces or electromagnetic wave reflecting surfaces in said room, and

wherein the environments in said laboratory are layout patterns of electromagnetic wave absorbing surfaces or electromagnetic wave reflecting surfaces in said laboratory.

11. An indoor environment evaluation method of evaluating an environment in a room for radio communication, which comprises:

an indoor environment input step of inputting the environment in said room;

a second signal propagation property calculation step of calculating a signal propagation property in a laboratory of an environment corresponding to the environment in said room inputted in said indoor environment input step, based on a relation between environments in the laboratory of a specific size and signal propagation properties in said laboratory, which is preliminarily obtained experimentally;

a second signal propagation property conversion step of converting the signal propagation property in said laboratory calculated in said second signal propagation property calculation step, to a signal propagation property in said room; and

an indoor environment evaluation step of evaluating the environment in said room for said radio communication, based on the signal propagation property in said room converted in said second signal propagation property conversion step;

wherein said second signal propagation property conversion step comprises a step of converting the signal propagation property in said laboratory to the signal propagation property in said room, based on comparison between a size of a space in said room and a size of a space in said laboratory.

12. The indoor environment evaluation method according to claim 11, wherein the signal propagation property in said room is a delay spread during radio communication in said room, and

wherein the signal propagation property in said laboratory is a delay spread during radio communication in said laboratory.

13. The indoor environment evaluation method according to claim 11, wherein the environment in said room is a layout pattern of electromagnetic wave absorbing surfaces or electromagnetic wave reflecting surfaces in said room, and

wherein the environments in said laboratory are layout patterns of electromagnetic wave absorbing surfaces or electromagnetic wave reflecting surfaces in said laboratory.

14. The indoor environment evaluation method according to claim 11, wherein said indoor environment evaluation step comprises a step of evaluating the environment in said room by calculating a communication quality implementable in said room.