EP0568142A2 - Improved transmitter network with a single transmitter frequency - Google Patents

Improved transmitter network with a single transmitter frequency Download PDF

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Publication number
EP0568142A2
EP0568142A2 EP93201153A EP93201153A EP0568142A2 EP 0568142 A2 EP0568142 A2 EP 0568142A2 EP 93201153 A EP93201153 A EP 93201153A EP 93201153 A EP93201153 A EP 93201153A EP 0568142 A2 EP0568142 A2 EP 0568142A2
Authority
EP
European Patent Office
Prior art keywords
transmitter
coverage area
auxiliary
network
transmitters
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.)
Withdrawn
Application number
EP93201153A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0568142A3 (enrdf_load_stackoverflow
Inventor
Paulus G. M. c/o INT. OCTROOIBUREAU B.V. De Bot
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.)
Koninklijke Philips NV
Original Assignee
Koninklijke Philips Electronics NV
Philips Electronics NV
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 Koninklijke Philips Electronics NV, Philips Electronics NV filed Critical Koninklijke Philips Electronics NV
Priority to EP93201153A priority Critical patent/EP0568142A2/en
Publication of EP0568142A2 publication Critical patent/EP0568142A2/en
Publication of EP0568142A3 publication Critical patent/EP0568142A3/xx
Withdrawn legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04H—BROADCAST COMMUNICATION
    • H04H20/00—Arrangements for broadcast or for distribution combined with broadcast
    • H04H20/65—Arrangements characterised by transmission systems for broadcast
    • H04H20/67—Common-wave systems, i.e. using separate transmitters operating on substantially the same frequency

Definitions

  • the invention relates to a transmitter network comprising at least two transmitters having a like transmitter frequency which transmit a like signal.
  • Such a transmitter network is known from the journal article entitled "DAB - A new sound broadcasting system, Status of the development - Routes to its introduction” by G. Plenge in EBU Review no. 246, April 1991, Chapter 5.2.2, pp. 87-112.
  • a signal is transmitted with a like transmitter frequency via a plurality of transmitters, whereas a receiver can receive signals from different transmitters.
  • a disturbance signal is developed having a characteristic corresponding to an echo signal.
  • This (undesired) echo signal is suppressed in the receiver by means of an echo canceller or by using a what is commonly referred to as guard band in the time domain when the signal to be transmitted is actually transmitted. Consequently, it is possible that this received signal is discarded in the receiver for a specific period of time during which the received signal is disturbed by the echo signals.
  • a great advantage of transmitter networks, in which no more than a single transmitter frequency is used, is that much fewer channels need to be available than when conventional transmitter networks are used.
  • the transmitter network is characterized, in that the transmitter network comprises a main transmitter and an auxiliary transmitter, the auxiliary transmitter having a smaller aerial height than the main transmitter and the auxiliary transmitter being installed on the boundary of the coverage area of the main transmitter.
  • auxiliary transmitters By adding a plurality of auxiliary transmitters with a smaller aerial height to the main transmitter, it becomes possible to realise a sharply defined coverage area of the transmitter network, which is meant to denote that with a specific size of the coverage area the disturbance caused outside this coverage area is reduced compared with the use of only a single main transmitter.
  • the auxiliary transmitters are installed on the boundary of the coverage area of the main transmitter, the size of the coverage area of the overall transmitter network is determined by the coverage area of the auxiliary transmitters.
  • the field strength received from an auxiliary transmitter with a smaller aerial height than that of the main transmitter diminishes more rapidly as a function of the distance from the receiver to this auxiliary transmitter than does the field strength received from a main transmitter as a function of the distance from the receiver to the main transmitter.
  • a further embodiment of the invention is characterized, in that the transmitter network comprises further auxiliary transmitters positioned on the boundary of the coverage area of another auxiliary transmitter, the aerial height of the further auxiliary transmitters becoming ever smaller as the boundary of the coverage area of the transmitter network is approached more.
  • auxiliary transmitters By positioning smaller auxiliary transmitters on the boundary of the coverage area of an auxiliary transmitter, it is possible to supply a high-quality signal to an erratically formed coverage area without causing much disturbance outside this area.
  • the dashed line a in Fig. 1 shows the field strength of the received signal as a function of the position of a receiver whilst assuming that no more than a single main transmitter A is used.
  • the coverage area is to have the size as denoted by the letter D and that the relative field strength within the coverage area is to be at least -90 dB.
  • This -90 dB value may be determined, for example, by disturbance caused by transmitters from a neighbouring area.
  • the solid lines show the received signal coming from the main transmitter A and the auxiliary transmitters B, , B 2 if a plurality of auxiliary transmitters Bi, B 2 are positioned 30 km apart around the main transmitter A.
  • the aerial height of the main transmitter A is assumed to be a 300 metres and the height of the aerials of the auxiliary transmitters B 1 and B 2 is assumed to be 10 metres.
  • Fig. 1 distinctly shows that the size of the coverage area may be maintained with a considerably lower transmitter power of the main transmitter A. This lower power of the main transmitter leads to a smaller field strength of the received signal outside the coverage area, as a result of which the disturbance caused outside the coverage area is reduced proportionally.
  • auxiliary transmitters B 1 to B 4 having a smaller aerial height are present increasing the overall coverage area.
  • further auxiliary transmitters D 3 , D 5 and D 6 and Di, D 2 and D 4 respectively are present on part of the boundary of the coverage area of the main transmitter A and on the boundary of the coverage area of the auxiliary transmitters B 1 to B 3 , the further auxiliary transmitters having an aerial height again smaller than that of the auxiliary transmitters B 1 to B 4 .
  • auxiliary transmitters E having an even smaller aerial height are present for completely covering the desired coverage area.

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Radio Relay Systems (AREA)
EP93201153A 1992-04-28 1993-04-21 Improved transmitter network with a single transmitter frequency Withdrawn EP0568142A2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP93201153A EP0568142A2 (en) 1992-04-28 1993-04-21 Improved transmitter network with a single transmitter frequency

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
EP92201191 1992-04-28
EP92201191 1992-04-28
EP93201153A EP0568142A2 (en) 1992-04-28 1993-04-21 Improved transmitter network with a single transmitter frequency

Publications (2)

Publication Number Publication Date
EP0568142A2 true EP0568142A2 (en) 1993-11-03
EP0568142A3 EP0568142A3 (enrdf_load_stackoverflow) 1994-03-02

Family

ID=26131364

Family Applications (1)

Application Number Title Priority Date Filing Date
EP93201153A Withdrawn EP0568142A2 (en) 1992-04-28 1993-04-21 Improved transmitter network with a single transmitter frequency

Country Status (1)

Country Link
EP (1) EP0568142A2 (enrdf_load_stackoverflow)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5787344A (en) * 1994-06-28 1998-07-28 Scheinert; Stefan Arrangements of base transceiver stations of an area-covering network

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4941200A (en) * 1987-08-03 1990-07-10 Orion Industries, Inc. Booster
FR2619478A1 (fr) * 1987-08-10 1989-02-17 Rousselie Jacques Reemetteur a amplification directe pour l'extension de la zone de couverture d'une section hertzienne
JPH01288022A (ja) * 1988-05-13 1989-11-20 Shimizu Corp 電磁遮蔽空間への外来電波再放射システム
US5038403A (en) * 1990-01-08 1991-08-06 Motorola, Inc. Simulcast system with minimal delay dispersion and optimal power contouring

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5787344A (en) * 1994-06-28 1998-07-28 Scheinert; Stefan Arrangements of base transceiver stations of an area-covering network
USRE37820E1 (en) * 1994-06-28 2002-08-13 Littlefeet, Inc. Arrangements of base transceiver stations of an area-covering network

Also Published As

Publication number Publication date
EP0568142A3 (enrdf_load_stackoverflow) 1994-03-02

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