EP0000038A1 - Verfahren und Anordnung für die Beseitigung von Interferenzen zwischen dem Strahlungsbündel einer Flächenausleuchtungsantenne und den Strahlungsbündeln stark gerichteter Antennen - Google Patents

Verfahren und Anordnung für die Beseitigung von Interferenzen zwischen dem Strahlungsbündel einer Flächenausleuchtungsantenne und den Strahlungsbündeln stark gerichteter Antennen Download PDF

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Publication number
EP0000038A1
EP0000038A1 EP78100062A EP78100062A EP0000038A1 EP 0000038 A1 EP0000038 A1 EP 0000038A1 EP 78100062 A EP78100062 A EP 78100062A EP 78100062 A EP78100062 A EP 78100062A EP 0000038 A1 EP0000038 A1 EP 0000038A1
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EP
European Patent Office
Prior art keywords
signal
coverage
area
spot
antenna
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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.)
Granted
Application number
EP78100062A
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English (en)
French (fr)
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EP0000038B1 (de
Inventor
Anthoney Acampora
Douglas Otto John Reudink
Yu Shuan Yeh
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.)
AT&T Corp
Original Assignee
Western Electric Co Inc
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Filing date
Publication date
Application filed by Western Electric Co Inc filed Critical Western Electric Co Inc
Publication of EP0000038A1 publication Critical patent/EP0000038A1/de
Application granted granted Critical
Publication of EP0000038B1 publication Critical patent/EP0000038B1/de
Expired legal-status Critical Current

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/14—Relay systems
    • H04B7/15—Active relay systems
    • H04B7/204—Multiple access
    • H04B7/2041—Spot beam multiple access

Definitions

  • the present invention relates to method and apparatus for effecting substantial cancellation of interference between a first and a second signal transmitted concurrently in a first and a second antenna radiated beam, respectively, where the first and second signals include different informational content and use the same frequency spectrum and the first and second beams overlap each other in the area of a receiver which is to receive only the first signals.
  • a separate spot coverage beam can be used for communication between the satellite and each high traffic ground station while an area coverage beam can be used for communication between the satellite and a plurality of low traffic ground stations under conditions where it might not be desirable to interconnect the individual low traffic ground stations to a nearest high traffic-ground station for access to the satellite system.
  • a typical prior art technique would be to use separate bandwidths or polarizations, if possible, for the spot coverage beams and the area coverage beam. Using separate bandwidths, however, results in inefficient use of the frequency spectrum and different polarizations may not be available where dual polarized beams are already used by each of the beams of the satellite system.
  • An alternative technique to enable rece ption of only one signal of a plurality of signals concurrently received from a plurality of transmitters at an FM receiver would be to modulate the carrier of each transmitter with a separate frequency to provide a unique address that is assigned to an associated receiver as disclosed, for example, in U.S. Reissue Patent Re. 27,478. Such arrangement may be applicable to FM communication systems but does not appear applicable to a digital communication system.
  • the problem remaining in the prior art is to provide a technique which permits overlapping spot and area coverage beams which use the same frequency band to be separated at an overlapped receiving station.
  • the foregoing problem is solved according to the invention by the method characterized by the step of, at the transmitter, coupling a predetermined portion of the second signal to be transmitted in the second beam into the signal to be transmitted by the first beam, said predetermined portion of the coupled-in second signal having a magnitude and phase to cancel substantially, after propagation in the first beam to the receiver, the second signal which arrives in the second beam at the receiver.
  • the invention provides for a transmitter characterised by a first antenna capable of transmitting the first beam with a predetermined field pattern E s ( ⁇ ) in the direction of the receiver which is to receive only the first signals; a second antenna capable of transmitting the second beam with a predetermined filed pattern E A (D) which overlaps said first beam field pattern in the area of the receiver which is to receive only the first signals; a first transmission line capable of delivering the signal to be transmitted in the first beam to the first antenna; a second transmission line capable of delivering the signal to be transmitted in the second beam to the second antenna, and a coupler disposed between the first and second transmission lines arranged to couple a predetermined portion of the second signal propagating in the second transmission line into the first transmission line for transmission in the first beam, the predetermined portion of the second signal coupled into the first transmission line having a magnitude and phase to substantially cancel the signal in the second beam arriving at the first beam receiver.
  • a transmitter characterised by a first antenna capable of transmitting the first beam with a predetermined field pattern E s ( ⁇
  • the present invention has been described primarily in relationship to a satellite communication system to enable the concurrent use of an area coverage satellite radiated beam and a plurality of spot coverage satellite radiated beams where all of the .beams use the same frequency spectrum and the spot coverage beams are received within the area encompassed by the area coverage beam.
  • a satellite communication system to enable the concurrent use of an area coverage satellite radiated beam and a plurality of spot coverage satellite radiated beams where all of the .beams use the same frequency spectrum and the spot coverage beams are received within the area encompassed by the area coverage beam.
  • inventive concept described is equally applicable to other radiated wave transmission systems - which comprise two or more beams which have different destinations but interfere with each other at one or more of the destinations.
  • FIG. 1 a satellite communication system is illustrated wherein the present invention is especially useful to permit the concurrent transmission from a satellite 10 of both an area coverage beam 12 and a plurality of spot coverage beams of which, for example, three beams 14a, 14b and 14c are shown with all beams being able to use the same frequency spectrum.
  • Spot coverage beams 14a, 14b and 14c are shown radiating from antennas 15a, 15b and 15c, respectively, and directed at respective ground areas 16a, 16b and 16c which include for example, high traffic ground stations 17a, 17b and 17c, respectively.
  • Area coverage beam 12 is shown radiating from an antenna 13 and directed at a ground area 18 which includes both the ground areas 16a, 16b and 16c and a plurality of low traffic ground stations of which, for example, four stations 19a-19d are shown.
  • each of the high traffic ground stations 17a-17c communicates with satellite 10 via a separate spot beam 14a-14c, respectively, while the low traffic ground stations 19a-19d communicate .
  • with satellite 10 via common area coverage beam 12 using any suitable technique to assure that a particular message will be processed by only the appropriate one of stations 19a-19d.
  • Such arrangement permits low traffic ground stations 19a-19d to communicate with satellite 10 under conditions where it is not advantageous to connect a low traffic ground station 19 to a nearby one of high traffic ground stations 17a-17c.
  • S represents the signal intended for a particular spot beam antenna 15 with a field pattern E s ( ⁇ ). More particularly, signals S sa , S sb and S sc propagate in waveguide 21a, 21b and 21c, respectively, to respective antennas 15a, 15b and 15c for radiation to respective ground stations 17a-17c via spot coverage beams 14a, 14b and 14c, respectively.
  • the field pattern E s (o) for each of the spot coverage beams 14 is assumed to be of Gaussian shape as, for example, in the main lobe of a paraboloid fed by a corrugated feedhorn, and is given by: where E (0) is in the magnitude of the field along the axis of each spot coverage beam 14.
  • S A represents the signal intended for area coverage beams 12 and is shown propagating in waveguide 21d to antenna 13 for radiation to ground stations 19 via area coverage beam 12 which has a field pattern E A ( ⁇ ) which is given by where E A (0) is the magnitude of the field along the axis of area coverage beam 12.
  • E A ( ⁇ ) represents the field pattern over area 18 of FIG. 1, it is desirable to produce a "hole" in E A ( ⁇ ) in the areas 16a-16c where the spot coverage beams 14a-14c exist such that E A does not interfere with each of the E s patterns.
  • interference between the signal S A transmitted via area coverage beam 12 and each of signals S sa , S sb and S sc transmitted via spot coverage beams 14a, 14b and 14c, respectively, is substantially reduced at each of the spot beam ground stations 17 by coupling a portion of the area coverage signal, S A , propagating in waveguide 21d, into each of the spot coverage signals S S sb and S sc propagating in waveguides 21a-21c, respectively, using respective directional couplers 22a, 22b and 22c.
  • each of couplers 22a-22c should preferably have a negative coupling coefficient of approximately between one and two times the value of .
  • Equation (3) can be simplified to The normalized power patterns for both a spot and the area coverage beams are and are shown in FIG. 3. From FIG. 3 it can be seen that the spot coverage beam 14 remains unchanged when received at associated area 16 whereas the area coverage beam 12 is significantly reduced in the spot coverage beam region 16.
  • the blackout region is that area which is serviceable by neither the area beam nor the spot beam because of mutual interference between the two beams.
  • The.traffic terminating in the blackout region at the edge of each of spot beam regions 16 may have to be trunked on the ground via other stations in the neighboring region.
  • the blackout region can be reduced or the S/I may be increased.
  • the capacity of the area coverage beam can be reduced by a factor of two and the modulations can be placed at the edges of the allocated 500 MHz bandwidth of the satellite downlink.
  • the power spectrums of a 300 Mbauds spot coverage peam and two 75 Mbauds area beams are shown in FIG. 5.
  • a ground station 19, intended to receive the area coverage beam 12 will have a receiving filter having characteristics which follow either spectrum A 1 or A 2 . Therefore, the received interference power of S S is reduced by about 6 dB due to this offsetting of modulation spectrum.
  • a ground station 17 intended to receive S s will have a receiving filter having characteristics which follow spectrum S in FIG. 5.
  • the received power of S A is reduced by about 9 dB compared to that of S .

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Radio Relay Systems (AREA)
EP78100062A 1977-06-03 1978-06-01 Verfahren und Anordnung für die Beseitigung von Interferenzen zwischen dem Strahlungsbündel einer Flächenausleuchtungsantenne und den Strahlungsbündeln stark gerichteter Antennen Expired EP0000038B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US803151 1977-06-03
US05/803,151 US4145658A (en) 1977-06-03 1977-06-03 Method and apparatus for cancelling interference between area coverage and spot coverage antenna beams

Publications (2)

Publication Number Publication Date
EP0000038A1 true EP0000038A1 (de) 1978-12-20
EP0000038B1 EP0000038B1 (de) 1981-10-14

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP78100062A Expired EP0000038B1 (de) 1977-06-03 1978-06-01 Verfahren und Anordnung für die Beseitigung von Interferenzen zwischen dem Strahlungsbündel einer Flächenausleuchtungsantenne und den Strahlungsbündeln stark gerichteter Antennen

Country Status (5)

Country Link
US (1) US4145658A (de)
EP (1) EP0000038B1 (de)
JP (1) JPS542613A (de)
CA (1) CA1105091A (de)
DE (1) DE2861149D1 (de)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU607738B2 (en) * 1986-12-23 1991-03-14 Messerschmitt-Bolkow-Blohm Gmbh Process for data transmission by means of a geo-stationary satellite and at least one sub-satellite
EP0578075A2 (de) * 1992-07-06 1994-01-12 Motorola, Inc. Übertragungsanordnung mit Spektrumswiederverwendung über eine kugelartige Fläche
EP1770877A2 (de) * 1997-10-17 2007-04-04 The Boeing Company Verfahren und Gerät für mehrere nicht uniforme Antenna-Strahlen für Kommunikationssatellit
EP2782266A3 (de) * 2013-03-19 2015-03-11 Delphi Technologies, Inc. Satellitenkommunikationssystem unter Verwendung hierarchischer Modulation um eine Vielzahl von modulierten Signalen von hoher und niedriger Priorität zu übertragen

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US4379398A (en) * 1980-06-12 1983-04-12 Kabushiki Kaisha Kobe Seiko Sho Pull-back type indirect extrusion press
US4450582A (en) * 1981-09-14 1984-05-22 Vitalink Communications Corporation Method and apparatus for increasing the capacity of a satellite transponder by reuse of bandwidth
JP2708655B2 (ja) * 1984-08-22 1998-02-04 リチャード、ジェー、ブランヤー 電池のグリッドの製造方法
US4823341A (en) * 1986-08-14 1989-04-18 Hughes Aircraft Company Satellite communications system having frequency addressable high gain downlink beams
US4827268A (en) * 1986-08-14 1989-05-02 Hughes Aircraft Company Beam-forming network
US4862721A (en) * 1988-02-16 1989-09-05 Hydramet American, Inc. Multiple cylinder extrusion apparatus and method
US5121503A (en) * 1989-11-06 1992-06-09 Motorola, Inc. Satellite signaling system having a signal beam with a variable beam area
KR950012831B1 (ko) * 1989-11-06 1995-10-21 모토로라 인코포레이티드 가변 빔 영역을 보유한 신호 빔을 가진 위성신호 표시 시스템
US5239668A (en) * 1989-11-06 1993-08-24 Motorola, Inc. Satellite signalling system
AU7170191A (en) * 1989-12-14 1991-07-18 Motorola, Inc. Satellite based acknowledge-back paging system
US5642358A (en) * 1994-04-08 1997-06-24 Ericsson Inc. Multiple beamwidth phased array
TW274170B (en) * 1994-06-17 1996-04-11 Terrastar Inc Satellite communication system, receiving antenna & components for use therein
US5745084A (en) * 1994-06-17 1998-04-28 Lusignan; Bruce B. Very small aperture terminal & antenna for use therein
US5678442A (en) * 1995-06-27 1997-10-21 Ube Industries, Ltd. Extruder
ATE193169T1 (de) * 1995-12-07 2000-06-15 Vistar Telecommunications Inc Verfahren zur verbesserung der effizienz der verwendung eines funkkanals in überlappenden bedeckungszonen
US6711398B1 (en) * 2000-04-19 2004-03-23 Hughes Electronics Corporation Radio signal broadcast system and method
US7366463B1 (en) * 2000-05-05 2008-04-29 The Directv Group, Inc. Military UHF and commercial Geo-mobile system combination for radio signal relay
US6642883B2 (en) * 2001-08-30 2003-11-04 Lockheed Martin Corporation Multi-beam antenna with interference cancellation network
US20110148706A1 (en) * 2009-12-18 2011-06-23 Electronics And Telecommunications Research Institute Antenna with controlled sidelobe characteristics

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US3325816A (en) * 1963-07-29 1967-06-13 Marconi Co Ltd Sidelobe suppressing antenna system comprising directional coupler and phase controlmeans for beam shaping
US3511936A (en) * 1967-05-26 1970-05-12 Bell Telephone Labor Inc Multiply orthogonal system for transmitting data signals through frequency overlapping channels

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US3511936A (en) * 1967-05-26 1970-05-12 Bell Telephone Labor Inc Multiply orthogonal system for transmitting data signals through frequency overlapping channels

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Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU607738B2 (en) * 1986-12-23 1991-03-14 Messerschmitt-Bolkow-Blohm Gmbh Process for data transmission by means of a geo-stationary satellite and at least one sub-satellite
EP0578075A2 (de) * 1992-07-06 1994-01-12 Motorola, Inc. Übertragungsanordnung mit Spektrumswiederverwendung über eine kugelartige Fläche
EP0578075A3 (en) * 1992-07-06 1994-05-11 Motorola Inc Communication system employing spectrum reuse on a spherical surface
EP1770877A2 (de) * 1997-10-17 2007-04-04 The Boeing Company Verfahren und Gerät für mehrere nicht uniforme Antenna-Strahlen für Kommunikationssatellit
EP1770877A3 (de) * 1997-10-17 2008-08-27 The Boeing Company Verfahren und Gerät für mehrere nicht uniforme Antenna-Strahlen für Kommunikationssatellit
EP2782266A3 (de) * 2013-03-19 2015-03-11 Delphi Technologies, Inc. Satellitenkommunikationssystem unter Verwendung hierarchischer Modulation um eine Vielzahl von modulierten Signalen von hoher und niedriger Priorität zu übertragen
US9042809B2 (en) 2013-03-19 2015-05-26 Delphi Technologies, Inc. Satellite communication having distinct low priority information broadcast into adjacent sub-regions

Also Published As

Publication number Publication date
EP0000038B1 (de) 1981-10-14
US4145658A (en) 1979-03-20
CA1105091A (en) 1981-07-14
DE2861149D1 (en) 1981-12-24
JPS542613A (en) 1979-01-10

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