WO1994014252A1 - Systeme de communication a frequences radioelectriques utilisant un guide d'ondes dispose dans un mobilier modulaire - Google Patents

Systeme de communication a frequences radioelectriques utilisant un guide d'ondes dispose dans un mobilier modulaire Download PDF

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Publication number
WO1994014252A1
WO1994014252A1 PCT/US1993/010689 US9310689W WO9414252A1 WO 1994014252 A1 WO1994014252 A1 WO 1994014252A1 US 9310689 W US9310689 W US 9310689W WO 9414252 A1 WO9414252 A1 WO 9414252A1
Authority
WO
WIPO (PCT)
Prior art keywords
waveguide
transmission medium
couplers
waveguide segments
signals
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/US1993/010689
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English (en)
Inventor
James E. Mitzlaff
Thomas A. Freeburg
Scott D. Munier
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Motorola Solutions Inc
Original Assignee
Motorola Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Motorola Inc filed Critical Motorola Inc
Publication of WO1994014252A1 publication Critical patent/WO1994014252A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B3/00—Line transmission systems
    • H04B3/52—Systems for transmission between fixed stations via waveguides

Definitions

  • This invention relates generally to high data rate radio-frequency (RF) communication systems, and more particularly to a waveguide transmission system for use within an in-building environment.
  • RF radio-frequency
  • interference is caused by the reception of signals from a nearby source using the same or an adjacent frequency to the communication channel of concern.
  • Multipath interference is caused when signals, subject to varying propagation delays, are received, offset in time, thereby creating an overlapping effect (intersymbol interference) which distorts the signal's intelligibility at the receiver.
  • the key parameter in this type of system is the number of chips per bit, which is referred to as the spread ratio.
  • the expansion in signal bandwidth produced by the chip-level processing is directly proportional to this spread ratio. This expanded bandwidth, in turn, creates a third wavelength scale, namely the chip
  • Systems employing antenna selectivity utilize a plurality of sectorized (directional) antennae at the receiver. Signals received on each antenna are evaluated for both signal strength and signal integrity. The antenna sector which boasts the highest signal strength and the least signal degradation due to multipath, co- channel and/or adjacent channel interference is selected.
  • Each above mentioned approach has the disadvantage that it requires substantial receiver circuitry and complexity in order to effectively operate within an environment characterized by substantial interference.
  • the spread spectrum approach requires not only a pseudo random (PN) signal generator but also phase-locking circuitry at each receiver to phase lock the PN signal generated at the transmitting and receiving points.
  • PN pseudo random
  • the antenna selection approach requires enough processing intelligence to evaluate a plurality of possible
  • Sixty-two transmitters which operate at different millimeter-wave carrier frequencies in one-half of the frequency spectrum carry east-west signals to 62
  • a multiplexer connects the 124 individual channels to the single waveguide
  • the present invention is an RF signal transmission medium and system for overcoming radio interference within an in-building environment.
  • a plurality of waveguide segments are connected together and disposed within an in-building environment to form an enclosed transmission medium.
  • a plurality of transceiver devices are coupled to the transmission medium for transmitting RF signals into and receiving RF signals from the enclosed transmission medium.
  • the waveguide segments are disposed within or integrally fashioned into modular office furnishings.
  • FIG. 1 is a block diagram of a portion of a prior art waveguide transmission system
  • FIG. 2 is a perspective view of a waveguide segment for use with the present invention
  • FIG. 3 depicts the waveguide segment of FIG. 2 disposed within a wall panel
  • FIG. 4 is a reference table which provides
  • FIG. 5 illustrates an embodiment of a waveguide transmission system utilizing the wall panels of FIG. 3;
  • FIG 6 is a block diagram of a transceiver as shown in FIG 5.
  • the present invention has application to RF communication systems deployed within in-building environments.
  • in-building environments are
  • RF communication signals are transmitted within an enclosed propagation medium comprised of a plurality of
  • detachable waveguide segments A plurality of
  • transceiver devices are coupled to the propagation medium for transmitting RF signals into and receiving RF signals from the enclosure. Since the enclosed
  • propagation medium is isolated from a multipath
  • the waveguide segments are integrally fashioned as a part of and disposed within modular office furnishings such as partitioning walls.
  • the partitioning wall When assembled, the partitioning wall functions as both a data communications network and an office space organizer.
  • FIG. 2 is a perspective view of a waveguide segment for use in accordance with the present invention.
  • each waveguide segment 200 is substantially rectangular in shape and is formed to have a cavity 202.
  • the waveguide segment 200 is also shown having an aperture 204.
  • This feature permits an external device such as a transceiver to propagate signals into and receive signals from the waveguide segment 200.
  • an external transceiver may utilize microstrip to waveguide transitions, RF probe to
  • waveguide transitions or aperture coupled transitions in order to to propagate signals into and receive signals from the waveguide segment 200.
  • FIG. 3 depicts the waveguide segment 200 disposed within an article of modular office furnishing.
  • the waveguide segment 200 is shown disposed within a partitioning wall 310.
  • Additional articles of modular office furnishing which may contain waveguide segments 200 include, without limitation, desks, tables and cabinets. Such articles of modular office furnishing, without waveguide segments 200, have in the past been available by
  • the waveguide segment 200 may also be formed utilizing any of the previously mentioned and well known sheet metal roll forming operations such as, hot- rolling, cold-rolling, seam-rolling, bead-rolling, flange-rolling and contour rolling. Since the hot- rolling, cold-rolling, seam-rolling, bead-rolling, flange-rolling and contour rolling. Since the hot- rolling, cold-rolling, seam-rolling, bead-rolling, flange-rolling and contour rolling. Since the
  • construction of waveguide segment 200 can be
  • waveguide segment 200 may be integrated into the steps for fabricating partitioning wall 310 with minimal additional time or expense. Since the above-mentioned fabrication methods for forming sheet metals into tubular and channel shapes are well known in the art, no additional discussion is required at this time. The interested reader may nonetheless refer to E.V. Crane, "Plastic Working of Metals and Power Press Operations" Wiley Press for additional discussion on the subject. In addition, waveguide segments 200 have in the past been available by contacting Microwave Developments Labs at 10 Michigan Drive, Natick, MA 01760.
  • waveguide segment 200 may be fashioned separately from the construction of partitioning walls 310 and then mounted within or upon partitioning walls 310 or internal building wall (not shown). In the alternative, such waveguide segments 200 may be disposed within open areas typically found above removable ceiling panels or in spaces typically found below removable floor panels .
  • waveguide segment 200 may be made from materials other than metals.
  • waveguide segment 200 may be constructed from plastic.
  • Suggested compounds comprise amorphous thermoplastics, such as Polycarbonate, Polystyrene and Polyetherimide; and crystalline thermoplastics such as Polypropolyne, modified Polypheneylene and nylon.
  • the wave guide segment 200 is made from Polycarbonate, utilizing any of the well known injection-molding and extrusion
  • Polycarbonate combines the relatively high temperature performance of 152°C with enough tensile strength in order to insure mechanical and environmental stability.
  • Polycarbonate components are easily fixed together utilizing well known adhering, fusing and welding techniques.
  • Polycarbonate structures readily accept the application of thin metal layer deposits by any of the well known metal deposition techniques.
  • polycarbonate it will be appreciated that several other thermoplastics provide available alternatives, such as, for example: Polyamide, Polyamide-imide, Polyether-imide, Polyaryl- ether-ketone, Polyaryl Sulfone, and Liquid Crystal
  • the external dimensions of waveguide segment 200 will be determined, in part, by packaging.
  • each waveguide segment 200 is integrally fashioned and disposed within an office partitioning wall panel 310.
  • Each panel 310 is typically 2 inches wide by 48-60 inches long. The external dimensions of waveguide segment 200 must therefore be tailored to fit within these confines.
  • Cavity 202 cross section dimensions are of greater concern, for they will influence the frequency of operation within a waveguide segment 200.
  • waveguide internal dimensions can be selected in order to promote propagation of desired signals within the waveguide, without causing the unwanted occurrence of moding (multipath
  • FIG. 4 is a reference table which provides
  • 18-19 GHZ is the desired frequency of operation.
  • the cavity 202 cross section internal dimensions are preferably 0.17 inches high and 0.42 inches across in order to provide single mode transmission for frequencies within this range.
  • waveguide segments having cavity cross sectional dimensions larger than those preferably required may nonetheless be used. In such instances it may be necessary to employ some form of mode filtering in order to suppress the generation of undesired modes within the oversized waveguide.
  • other frequencies of operation and waveguide dimensions may be selected from the table of values provided in FIG. 4 without departing from the spirit of the present invention.
  • FIG. 5 illustrates an embodiment of a waveguide transmission system in accordance with the present invention.
  • a plurality of wall segments 310 having integrally fashioned waveguide segments 200 are connected together to provide office organization, while simultaneously creating an enclosed transmission medium which operates as a communications network.
  • the individual wall panels 310 are connected together via mechanical couplers such as straight through coupler 510, flanges 520, four way couplers 530, right angle couplers 540 and T couplers 550.
  • These couplers operate to connect the waveguide segments 200 and wall panels 310 using either mechanical or adhesive coupling.
  • these couplers may be constructed from sheet metal or plastic in accordance with known sheet metal roll forming operations or plastic injection molding and extrusion procedures as set forth above.
  • couplers 510-550 are fashioned to have dimensions slightly larger than those of the waveguide segments 200 such that a coupler will physically overlap an exposed portion of waveguide segment 200. Overlapped coupling like that anticipated by the preferred
  • embodiment enjoys the advantages provided by ease of fabrication and assembly, as well as the performance enhancements provided by reduced signal leakage and minimal insertion loss at the coupling intersections.
  • couplers 510-550 may be dimensioned such that they can be physically inserted into or overlapped by the waveguide segments 200.
  • end caps 503. Disposed at ends of the waveguide structure and connected to waveguide segments 200 are end caps 503. In conjunction with the interconnected waveguide
  • end caps 503 operate to provide an enclosed transmission medium or communications network, disposed within the modular wall structure.
  • Each end cap 503 includes or comprises RF absorbing material 505.
  • the use of RF absorbing material 505 operates to minimize the reflection of RF energy within the communications network while preventing leakage of RF energy outside of the communications network.
  • transceiver devices 560 are transceiver devices 560. Each transceiver device 560 is connected to a partitioning wall panel 310 and coupled to the communications network via an aperture 204 in waveguide segment 200. The transceivers 560 operate to transmit signals into and receive signals from the enclosed communication network. As such, transceiver 560 are coupled to the
  • communications network as defined by the enclosed waveguide structure, utilizing microstrip to waveguide transitions, RF probe to waveguide transitions or aperture coupled transitions.
  • FIG. 6 is a block diagram representation of the transceiver as shown in FIG 5. As depicted, the
  • transceiver 560 includes a receive transition 602, diode detector 604, limiting amplifier 606, data squelch 608, transceiver controller 610, pulse modulator 612,
  • the controller 610 is shown connected via bus 618 to a user device such as, for example, a personal computer (PC), a telephone or any other peripheral device desirous of communicating within the network defined by the interconnected waveguide segments 200.
  • the transceiver controller 610 controls transmit and receive operations such as biphase encoding/decoding, synchronization and network protocol support.
  • Such a controller has in the past been available under part number Am79C960 by contacting Advanced Micro Devices Inc. at 901 Thompson Place, Sunnyvale, CA 94088.
  • controller 610 receives a signal for transmission from a user device. This signal is biphase encoded by controller 610 and passed to pulse modulator 612 as a digital input signal. Pulse modulator 612 supplies power to microwave oscillator 614 when the data input signal from controller 610 is at a logic high status level and removes power to microwave oscillator 614 when the data input signal from controller 610 has a logic low status level, thereby producing a biphase encoded, pulsed microwave signal which is coupled into the waveguide segment 200 and propagated from transmit transition 616 to all of the other transceivers connected to the network.
  • a transmitted signal is sensed by receive transition 602 and detected by diode detector 604 which produces a low level pulse waveform in response thereto.
  • This waveform is amplified and clipped by limiting amplifier 606, thereby converting it back into a biphase encoded data signal.
  • RSSI received signal strength indication
  • Data squelch 608 compares RSSI to a predetermined threshold and gates biphase encoded data signals to the controller 610 in response to a determination that a signal is actually present as determined by the comparison.
  • This process prevents the controller 610 from being
  • controller 610 Upon receipt of a data signal from data squelch 608, controller 610 biphase decodes the signal and passes it over bus 618 to the appropriate user device. While not shown, there are other user device interfaces controller 610 may communicate over. For example, controller 610 may be configured in order to transmit and receive signals via a twisted pair port such as 10 BASE-T as is known in the art.

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)

Abstract

Un système de transmission (500) de signaux à frequences radioélectriques (RF) destiné à surmonter les interférences radioélectriques dans un environnement d'immeubles comprend une pluralité de segments (200) de guides d'ondes connectés les uns aux autres pour former un support de transmission fermé. Une pluralité de dispositifs émetteurs-récepteurs (560) est couplée au support de transmission afin d'émettre des signaux RF dans le support de transmission et de recevoir des signaux RF à partir de celui-ci, ce qui permet d'éviter les effets délétères des interférences radio des immeubles. Selon un mode de réalisation, les segments (200) de guides d'ondes sont intégrés ou disposés dans des panneaux muraux (310) modulaires.
PCT/US1993/010689 1992-12-14 1993-11-08 Systeme de communication a frequences radioelectriques utilisant un guide d'ondes dispose dans un mobilier modulaire Ceased WO1994014252A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US99014192A 1992-12-14 1992-12-14
US07/990,141 1992-12-14

Publications (1)

Publication Number Publication Date
WO1994014252A1 true WO1994014252A1 (fr) 1994-06-23

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PCT/US1993/010689 Ceased WO1994014252A1 (fr) 1992-12-14 1993-11-08 Systeme de communication a frequences radioelectriques utilisant un guide d'ondes dispose dans un mobilier modulaire

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MX (1) MX9307880A (fr)
WO (1) WO1994014252A1 (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1239600A1 (fr) * 2001-03-07 2002-09-11 Abb Research Ltd. Système de communication sans fil utilisant un guide d'ondes
EP1361672A1 (fr) * 2002-05-07 2003-11-12 Abb Research Ltd. Bus à guide d' ondes pour dispositifs numériques
EP1361671A1 (fr) * 2002-05-07 2003-11-12 Abb Research Ltd. Bus par guide de micro-ondes pour des dispositifs numériques
EP1361673A1 (fr) * 2002-05-07 2003-11-12 Abb Research Ltd. Bus microonde pour rack destiné à des dispositifs numériques
US20160114686A1 (en) * 2014-10-27 2016-04-28 At&T Intellectual Property I, L.P. Methods and apparatus to charge a vehicle and to facilitate communications with the vehicle

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2129712A (en) * 1933-12-09 1938-09-13 American Telephone & Telegraph Transmission of energy effects by guided electric waves in a dielectric medium
US4685255A (en) * 1984-09-10 1987-08-11 Herman Miller, Inc. Work space management system
US4777652A (en) * 1982-07-27 1988-10-11 A.R.F. Products Radio communication systems for underground mines
US4790000A (en) * 1985-12-11 1988-12-06 Hitachi, Ltd. Portable radio telephone system

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2129712A (en) * 1933-12-09 1938-09-13 American Telephone & Telegraph Transmission of energy effects by guided electric waves in a dielectric medium
US4777652A (en) * 1982-07-27 1988-10-11 A.R.F. Products Radio communication systems for underground mines
US4685255A (en) * 1984-09-10 1987-08-11 Herman Miller, Inc. Work space management system
US4790000A (en) * 1985-12-11 1988-12-06 Hitachi, Ltd. Portable radio telephone system

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1239600A1 (fr) * 2001-03-07 2002-09-11 Abb Research Ltd. Système de communication sans fil utilisant un guide d'ondes
WO2002071643A1 (fr) * 2001-03-07 2002-09-12 Abb Research Ltd Communication entre batis
CN1498459B (zh) * 2001-03-07 2011-12-14 Abb研究有限公司 变电站及其设置方法和在控制单元之间传送信号的方法
CN101694926B (zh) * 2001-03-07 2014-07-16 Abb研究有限公司 变电站及其设置方法和在控制单元之间传送信号的方法
EP1361672A1 (fr) * 2002-05-07 2003-11-12 Abb Research Ltd. Bus à guide d' ondes pour dispositifs numériques
EP1361671A1 (fr) * 2002-05-07 2003-11-12 Abb Research Ltd. Bus par guide de micro-ondes pour des dispositifs numériques
EP1361673A1 (fr) * 2002-05-07 2003-11-12 Abb Research Ltd. Bus microonde pour rack destiné à des dispositifs numériques
US20160114686A1 (en) * 2014-10-27 2016-04-28 At&T Intellectual Property I, L.P. Methods and apparatus to charge a vehicle and to facilitate communications with the vehicle
US10106045B2 (en) 2014-10-27 2018-10-23 At&T Intellectual Property I, L.P. Methods and apparatus to charge a vehicle and to facilitate communications with the vehicle

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Publication number Publication date
MX9307880A (es) 1994-06-30

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