WO1997042718A1 - Systeme de radiodiffusion a reutilisation de la bande - Google Patents

Systeme de radiodiffusion a reutilisation de la bande Download PDF

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Publication number
WO1997042718A1
WO1997042718A1 PCT/US1997/007307 US9707307W WO9742718A1 WO 1997042718 A1 WO1997042718 A1 WO 1997042718A1 US 9707307 W US9707307 W US 9707307W WO 9742718 A1 WO9742718 A1 WO 9742718A1
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WO
WIPO (PCT)
Prior art keywords
multiuse
sites
transmit
microwave signal
receive
Prior art date
Application number
PCT/US1997/007307
Other languages
English (en)
Inventor
Stephen P. Seiter
Perry W. Haddon
Original Assignee
Ghz Equipment Company, 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 Ghz Equipment Company, Inc. filed Critical Ghz Equipment Company, Inc.
Priority to AU27495/97A priority Critical patent/AU2749597A/en
Publication of WO1997042718A1 publication Critical patent/WO1997042718A1/fr

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas

Definitions

  • the present invention pertains in general to broadcast systems, such as television broadcasting, and in particular to a configuration for a broadcasting system in which a single band is used concurrently for transmission of different multiuse microwave signals in a single service area from multiple transmission sites.
  • the number of stations that can broadcast television signals in any one area is limited by the available spectrum.
  • the demand for spectrum allocations far exceeds the spectrum which is available.
  • Current government policy is to auction spectrum to the highest bidder, and this procedure has made spectrum allocation even more valuable.
  • the present invention is directed to a broadcasting system configuration which permits multiple multiuse microwave signals to be carried on the same band in the same geographic area. This allows for spectrum reuse since a single band can be used by multiple parties in a single geographic area.
  • a selected embodiment ofthe present invention is a broadcast system for providing multiple multiuse microwave signals concurrently on a single band to a unitary service area. It includes one or more first multiuse microwave signal transmit sites, each of which has a transmit antenna for line-of-sight broadcasting on said band to the service area. The system further includes one or more second multiuse microwave signal transmit sites, each of which has a transmit antenna for line-of-sight broadcasting on the same band to the same service area. The first multiuse microwave signal is different from the second multiuse microwave signal. A plurality of receive sites are present within the service area. Each receive site has a directional antenna which has a beamwidth that is less than the beamwidth ofthe transmit antennas.
  • a first set ofthe receive sites has each directional antenna thereof focused toward one ofthe transmit antennas for the first multiuse microwave signal transmit sites.
  • a second set ofthe receive sites has each ofthe directional antennas thereof focused toward one ofthe transmit antennas for the second multiuse microwave signal transmit sites.
  • the first and second multiuse microwave signal sites are sufficiently distant from each other such that only one ofthe multiuse microwave signal transmit sites is within the beam of any one ofthe receive site directional antennas.
  • Figure 1 is an illustration of a service area which receives a first multiuse microwave signal from a first pair of transmit sites and a second multiuse microwave signal from a second pair of transmit sites but with all transmit sites transmitting on a common band, and
  • Figure 2 is an illustration of such a system as shown in Figure 1 but including multiple multiuse microwave signals being transmitted on each of a plurality of bands to illustrate multiple reuse of broadcast bands.
  • Broadcast system 10 provides multiple multiuse microwave signals to a service area 12, generally indicated by the dashed line.
  • the service area can have almost any shape.
  • a first multiuse microwave signal A is provided by the transmit sites 14 and 16.
  • a second multiuse microwave signal B is provided by the transmit sites 18 and 20.
  • the transmit sites 14, 16, 18 and 20 have respective transmit antennas 14 A, 16A, 18A and 20A.
  • the transmit sites are positioned along the periphery ofthe service area 12.
  • Each ofthe transmit sites is provided with a transmit antenna which transmits a signal on a common frequency band.
  • all four transmit sites operate on the same band; however, the sites 14 and 16 transmit one multiuse microwave signal (A) and the sites 18 and 20 transmit a different multiuse microwave signal (B).
  • a broadcast band can be a one gHz segment of spectrum, for example, from 29 gHz to 30 gHz.
  • a second band can be, for example, from 30 gHz to 31 gHz.
  • Each band carries a multiuse microwave signal which typically comprises a plurality of channels, each which may include a group of video channels. If each channel is allocated a bandwidth of 20 MHz, then 50 channels can be carried in one band. Each channel need not have the same bandwidth. For example, an audio channel requires much less bandwidth than a video channel. Further, a band may have only one channel.
  • Transmit site 14 produces a transmit beam pattern 30 which, for the illustrated embodiments, has an angle of less than 180°, but substantially encompasses the service area 12. However, any beamwidth can be used which is needed to cover the service area. A wide beamwidth may be required for a service area which has an unusual shape or mountain topography.
  • the transmit site 16 antenna produces a beam pattern 32 which likewise substantially encompasses the service area 12.
  • the transmit site 18 has a beam pattern 34 and the transmit site 20 has a beam pattern 36.
  • the sites 14, 16, 18 and 20 are located on the outside of service area 12 and along the periphery thereof.
  • All ofthe transmit sites have transmitters which operate at frequencies of one gHz or above. In preferred embodiments, the transmitters operate above 20 gHz.
  • the service area 12 includes a plurality of receive sites 42, 44, 46 and 48. These are generally schools or consumer locations such as residences or businesses. Each receive site is provided with a directional receive antenna as indicated in Figure 1. Each receive site has a small antenna, such as a parabolic dish. For the receive sites 42-48, these are directional receive antennas 42 A, 44 A, 46 A and 48 A.
  • the preferred embodiments ofthe receive antennas, together with appropriate receivers and down converters, are manufactured by GHz Equipment Company, Inc., located at Tempe, Arizona. Such equipment is available for frequency bands above 20 gHz. The beamwidth of a receive site antenna is dependent upon the size ofthe antenna and the operating frequency. Transmitters and the associated equipment needed for broadcasting at these frequency bands are also available from GHz Equipment Company, Inc.
  • the receive sites 42, 44, 46 and 48 have respective receive antenna main lobe beamwidth patterns 60, 62, 64 and 66. These patterns preferably have a beamwidth with performance characteristics such that the differential between the main lobe and its side lobes is at least -30 dBi.
  • the preferred main lobe beamwidth is in the range of 1.3° to 5°.
  • all four transmit sites operate on the same band, for example, 29-30 gHz.
  • the sites 14 and 16 transmit a different multiuse microwave signal from that ofthe sites 18 and 20.
  • Each receive site has its respective directional receive antenna focused toward one, and only one, transmit site.
  • the transmit sites are positioned at such a distance from each other such that each receive site within the service area 12 can have only one transmit site within the main lobe beam pattern of its directional receive antenna at any one time.
  • the receive antennas are fixed in place once a particular transmit site is selected.
  • a particular receive site can receive signals from both the A and B multiuse microwave signal transmit sites at one time if it has multiple receive antennas.
  • the receive site 42 has its narrow beam receive antenna focused toward the transmit site 16. Although receive site 42 is within the beam pattern of all the other three transmit sites 14, 18 and 20, it receives only the multiuse microwave signal from transmit site 16.
  • the receive site 44 antenna is focused toward the transmit site 20 and receives only the signal from that site.
  • the receive site 46 antenna is focused only toward transmit site 14 and receive site 48 antenna is focused only toward transmit site 20.
  • the use of multiple transmit sites, such as 14 and 16, for the same multiuse microwave signal on the same band, but positioned at different locations about the service area 12 increases the probability that any particular receive site will be able to receive the desired multiuse microwave signal without being "shaded" by intervening objects, such as buildings, trees or hills.
  • the same band is used in the one service area 12 by two different program providers which supply the multiuse microwave signals A and B.
  • the spectrum for a single band is being reused within the single geographic area.
  • Broadcast system 80 uses bands FI and F2 for a single service area 82, which is identified by the dashed line.
  • band FI can be 29- 30 gHz and band F2 can be 30-31 gHz.
  • the broadcast system 80 includes transmit sites 84, 86, 88, 90 and 92. These transmit sites have respective transmit antennas 84A, 86A, 88A, 90A and 92A.
  • the transmit antennas at the sites 84, 86, 88, 90 and 92 have respective beam patterns 96, 98, 100, 102 and 104. Each transmit site produces a beam pattern which substantially encompasses the service area 82.
  • the transmit sites 84, 86 and 88 use band FI and transmit sites 90 and 92 use band F2. Transmit sites 84 and 86 broadcast multiuse microwave signal A, site 88 broadcasts multiuse microwave signal B, site 90 broadcasts multiuse microwave signal C and site 92 broadcasts multiuse microwave signal D.
  • four different multiuse microwave signals can be currently broadcast to one geographic area on only two bands.
  • Each receive site is provided with a corresponding narrow beamwidth receive antenna 108A-122A.
  • the receive equipment and bandwidths for the receive sites shown in Figure 2 are the same as those described for Figure 1, but with multiple operating bands used in Figure 2.
  • the receive sites 108-122 have respective receive antenna beam patterns 126, 128, 130, 132, 134, 136, 138 and 140. Each of these beam patterns is substantially narrower than the beam pattern widths ofthe transmit antennas.
  • the receive sites 108, 110, 114, 118 and 120 receive band FI and the receive sites 112, 116 and 122 receive band F2.
  • Multiuse microwave signals A, B, C and D are transmitted by the broadcast system 80 shown in Figure 2.
  • Multiuse microwave signals A and B are carried in band FI and multiuse microwave signals C and D are carried in band F2.
  • each band can include a substantial number of channels.
  • the system ofthe present invention can also be utilized wherein a single transmit site can broadcast on multiple frequency bands.
  • the present invention can substantially increase the amount of multiuse microwave signals that can be transmitted on a given amount of broadcast spectrum.
  • sites 84 and 90 may be collocated and sites 86 and 92 may be collocated.
  • a summary chart is given below illustrating the relationship ofthe transmit sites, the bands used by the transmit sites, the multiuse microwave signals transmitted on each band and the signals received at each receive site.
  • the present invention comprises a broadcast system for transmission of video and any other information to a single service area wherein each available band can be reused to provide additional multiuse microwave services.
  • One example of allocation can have multiuse microwave signal A used for a commercial system, such as subscription television, and multiuse microwave signal B used for educational broadcasting in which case receive site 118 would be a school.
  • the educational multiuse microwave spectrum is made available by reuse of spectrum allocated to commercial activity.

Abstract

Un système (10) de radiodiffusion fonctionne avec une pluralité de sites de transmission (14, 16, 18, 20) qui définissent chacun un diagramme de rayonnement (30, 32, 34, 36) de transmission en visibilité directe pour une zone (12) de desserte unique. Une pluralité de sites (42, 44, 46, 48) de réception sont situés dans la zone (12) de desserte et individuellement équipés d'une antenne (42A, 44A, 46A, 48A) de réception directive à ouverture angulaire étroite qui est orientée vers un seul des sites (14, 16, 18, 20) de transmission. Les sites de transmission sont positionnés à une distance suffisante les uns des autres pour qu'un seul site de transmission se situe dans un diagramme de rayonnement (62, 64, 66) du faisceau du lobe principal d'une antenne de réception située dans la zone (12) de desserte. Les sites de transmission envoient une pluralité de signaux (A, B) hyperfréquence multiutilisation sur une bande commune pour une zone de desserte unique de sorte que le spectre disponible est réutilisable. Cette réutilisation du spectre peut être appliquée à chacune des bandes qui sont disponibles dans une zone de desserte donnée.
PCT/US1997/007307 1996-05-03 1997-04-30 Systeme de radiodiffusion a reutilisation de la bande WO1997042718A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU27495/97A AU2749597A (en) 1996-05-03 1997-04-30 Broadcast system with band reuse

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US64248696A 1996-05-03 1996-05-03
US08/642,486 1996-05-03

Publications (1)

Publication Number Publication Date
WO1997042718A1 true WO1997042718A1 (fr) 1997-11-13

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US1997/007307 WO1997042718A1 (fr) 1996-05-03 1997-04-30 Systeme de radiodiffusion a reutilisation de la bande

Country Status (2)

Country Link
AU (1) AU2749597A (fr)
WO (1) WO1997042718A1 (fr)

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4255814A (en) * 1977-07-15 1981-03-10 Motorola, Inc. Simulcast transmission system
US4347626A (en) * 1978-12-23 1982-08-31 Robert Bosch Gmbh Radio telephone communication network
US4528656A (en) * 1982-07-02 1985-07-09 Harris Corporation Radio communication system using frequency division multiplexing for transmission between a master station and a plurality of remote stations
US4928177A (en) * 1988-04-11 1990-05-22 Cooper Industries, Inc. Two-way data broadcast networks
US5214787A (en) * 1990-08-31 1993-05-25 Karkota Jr Frank P Multiple audio channel broadcast system
US5287550A (en) * 1990-12-24 1994-02-15 Motorola, Inc. Simulcast scheduler
US5345599A (en) * 1992-02-21 1994-09-06 The Board Of Trustees Of The Leland Stanford Junior University Increasing capacity in wireless broadcast systems using distributed transmission/directional reception (DTDR)
US5437052A (en) * 1993-04-16 1995-07-25 Conifer Corporation MMDS over-the-air bi-directional TV/data transmission system and method therefor
US5559808A (en) * 1995-03-16 1996-09-24 Bell Atlantic Network Services, Inc. Simulcasting digital video programs

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4255814A (en) * 1977-07-15 1981-03-10 Motorola, Inc. Simulcast transmission system
US4347626A (en) * 1978-12-23 1982-08-31 Robert Bosch Gmbh Radio telephone communication network
US4528656A (en) * 1982-07-02 1985-07-09 Harris Corporation Radio communication system using frequency division multiplexing for transmission between a master station and a plurality of remote stations
US4928177A (en) * 1988-04-11 1990-05-22 Cooper Industries, Inc. Two-way data broadcast networks
US5214787A (en) * 1990-08-31 1993-05-25 Karkota Jr Frank P Multiple audio channel broadcast system
US5287550A (en) * 1990-12-24 1994-02-15 Motorola, Inc. Simulcast scheduler
US5345599A (en) * 1992-02-21 1994-09-06 The Board Of Trustees Of The Leland Stanford Junior University Increasing capacity in wireless broadcast systems using distributed transmission/directional reception (DTDR)
US5437052A (en) * 1993-04-16 1995-07-25 Conifer Corporation MMDS over-the-air bi-directional TV/data transmission system and method therefor
US5559808A (en) * 1995-03-16 1996-09-24 Bell Atlantic Network Services, Inc. Simulcasting digital video programs

Also Published As

Publication number Publication date
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