EP1177647A2 - Distribution sans fil de services dth sur une voie presentant une largeur de bande limitee - Google Patents

Distribution sans fil de services dth sur une voie presentant une largeur de bande limitee

Info

Publication number
EP1177647A2
EP1177647A2 EP00932135A EP00932135A EP1177647A2 EP 1177647 A2 EP1177647 A2 EP 1177647A2 EP 00932135 A EP00932135 A EP 00932135A EP 00932135 A EP00932135 A EP 00932135A EP 1177647 A2 EP1177647 A2 EP 1177647A2
Authority
EP
European Patent Office
Prior art keywords
user
transponder
signal
satellite
transmitter
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Withdrawn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
EP00932135A
Other languages
German (de)
English (en)
Inventor
Daniel J. Gregoire
Hossein Izadpanah
James H. Schaffner
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.)
HRL Laboratories LLC
Original Assignee
HRL Laboratories LLC
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 HRL Laboratories LLC filed Critical HRL Laboratories LLC
Publication of EP1177647A2 publication Critical patent/EP1177647A2/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04H—BROADCAST COMMUNICATION
    • H04H40/00—Arrangements specially adapted for receiving broadcast information
    • H04H40/18—Arrangements characterised by circuits or components specially adapted for receiving
    • H04H40/27—Arrangements characterised by circuits or components specially adapted for receiving specially adapted for broadcast systems covered by groups H04H20/53 - H04H20/95
    • H04H40/90—Arrangements characterised by circuits or components specially adapted for receiving specially adapted for broadcast systems covered by groups H04H20/53 - H04H20/95 specially adapted for satellite broadcast receiving

Definitions

  • This invention relates to the field of wireless television channel transmission, and more particularly, to the transparent distribution of Direct To Home (DTH) Services to multiple users on a limited-bandwidth channel.
  • DTH Direct To Home
  • Satellites have made a significant difference in the way the world communicates. Since the late 1960's the television industry has increasingly made use of satellites to improve communications.
  • a well-known method of television channel transmission involves the use of satellites which orbit above the Earth and are used for retransmitting signals from one location on the Earth to another.
  • the typical satellite includes thereon multiple transponders, which are receiver- transmitter units aboard the satellite.
  • a typical uplink signal at 17 GHz is received by the transponder from a broadcast center satellite transmitting station on Earth and is converted to a 14 GHz downlink signal which is sent from the satellite to Earth.
  • This methodology provides the basis for the emerging Direct-To-Home systems for communication signal transmission, including television transmission from a signal transmission station to a hor-ne-or other location's user display receiver, such as a television receiver.
  • DTH Hughes DirecTV(trademark) (DTV) system. While this disclosure will focus the invention's application on the DTV system, those skilled in the art will appreciate that the invention disclosed hereinafter is applicable to any DTH satellite broadcast system.
  • DTN's downlink signal consists of 32 transponder signals that lie in the range between 950 and 1450 MHz. Each transponder signal comes from a 120W or 240W Traveling Wave Tube (TWT) Power Amplifier on one of the broadcast satellites. Each transponder signal is 24 MHz wide with a 5.16 MHz guard band between transponders, and contains several television channels encoded in a proprietary format. The transponders are numbered from 1 to 32. The odd numbered ones are transmitted with right-hand polarization, while the even numbered transponders are left-hand polarized.
  • TWT Traveling Wave Tube
  • DTH can be distributed to multiple users using a single earth station antenna system for reception and a cable network for each user.
  • the single earth station antenna is typically very large and a large amount of cabling in the cable network is required.
  • DTH can be distributed to multiple users having a receiving antenna for each user.
  • receiving antennas there are many locations where it is undesirable to erect multiple receiving antennas, such as for apartment complexes, educational facilities, neighborhoods, etc.
  • each individual television channel is typically demodulated, then re-modulated and upconverted for broadcasting within the location.
  • An Integrated Receiver Decoder (IRD) is used to access the desired transponder signals and to decode the channel information into National Television Systems Committee (NTSC) format for display on a television.
  • NTSC National Television Systems Committee
  • Another alternative method is to use one receiving antenna, upconvert the entire signal from 950 - 1950 MHz for local wireless transmission to the users, each of which have their own local wireless receiver and IRD. However, this would require 1000 MHz of local wireless bandwidth.
  • the present invention provides a solution to such problems.
  • an enhanced method and system for wireless Direct To Home satellite services signal distribution to a plurality of service requesting users.
  • Each user controls an IRD associated with a user display receiver, such as a television set.
  • a control processor senses the channel change.
  • the processor uses this information to set control signals that are sent back on a wireless connection to a multiple-user transmitter unit that is connected to an earth station (satellite dish) antenna.
  • the multi-user transmitter processes the control signals and sends them
  • transponder selector which filters out a single transponder signal for transmission to the user.
  • transponder signals are sent forward, one for each of the users.
  • a typical implementation of the invention would have five to ten users and the local wireless channel would accommodate a comparable number of transponders.
  • Each user has a receiver at his location that filters the broadcast signal from the transponder signal that he requested. A much smaller bandwidth results than that which would be required to transmit signals from all 32 transponders to each user.
  • the width of the frequency band required for transmission to several independent users can be much smaller than the frequency bandwidth required to transmit the entire DTH signal.
  • 5 users can be easily accommodated on the 200 MHz wide U- NII band at 5250 MHz as compared with the 1000-MHz wide band necessary to transmit all DTH transponders to each user.
  • a small U-NII antenna (only 3" x 3") can be used to broadcast the signal from the multi-user transmitter to the users.
  • the multi-user transmitter is coupled to the earth satellite antenna to receive selectable satellite transponder signals.
  • the multi-user transmitter includes a plurality of transponder selectors, each transponder
  • Each service requesting user is provided with a user-controllable channel selector (IRD) for accessing the selectable satellite transponder signals.
  • the user-controllable channel selector is coupled to a respective user display unit and to a respective user receiver unit.
  • the user receiver unit is responsive to a service-requesting user-selected-channel signal for transmitting a transponder selection signal to the multi-user transmitter.
  • the transponder selection signal is indicative of a desired satellite transponder signal to be transmitted to the service requesting user associated with the respective user selected channel signal.
  • the multi-user transmitter broadcasts the selected satellite transponder signals to the plurality of service requesting users in response to the transponder selection signals.
  • the desired satellite transponder signal is then coupled to the requesting user- controllable channel selector for display by the respective user display unit.
  • the present invention will enhance the capabilities of any wideband DTH satellite system and provide a wide range of applications for both defense and commercial systems.
  • Fig. 1 is a block diagram of the DTH distribution system in accordance with the present invention.
  • Fig. 2 is a block diagram of a user receiver unit in accordanc-e-with the present invention.
  • Fig. 3 is a block diagram of a multi-user transmitter in accordance with the present invention.
  • Fig. 4 is a spectrum graph showing the combination of three transponder signals and control data in accordance with the present invention.
  • Fig. 1 illustrates a block diagram of an embodiment of the invention that distributes a DTH signal to multiple independent users.
  • DTH signal 10 is received at satellite Earth station antenna 14 and is provided to multi-user transmitter (MUT) 12. Inside the MUT, the DTH signal is split off to five different transponder selectors 16, one for each user, namely TS 1, TS2, TS3, TS4 and TS5 for this five-user embodiment.
  • the transponder selectors are controlled by transponder controller 18 internal to MUT 12.
  • Each transponder selector outputs the signal from a single transponder and downconverts it in frequency so that it is centered at an intermediate frequency for further processing.
  • Each of the users has a dedicated intermediate frequency.
  • the table below shows an example of frequency allocations for the five user embodiment wherein the U-NII communications band is at 5150 to 5350 MHz. However, the practice of the invention is not limited to the use of this band.
  • Transponder controller 18 is controlled by control signals from user responder units, one for each user at the user location, that determine which transponder the user wants to access.
  • the user responder units operation is described in more detail hereinafter.
  • Transmitter 22 bundles the transponders at the intermediate frequency band and upconverts them to a higher frequency for broadcast to the users.
  • Circulator 23 is coupled between transmitter 22 and transponder controller 18 and transmitter / controller antenna 26.
  • Each user has a receiver unit 24 that picks up the broadcast signal from transmitter / controller antenna 26 by user antenna 28 and through circulator 27 and receiver 29, one respectively for each user, namely Rl, R2 ... R5, downconverts it and filters out the transponder signal intended for him.
  • Each receiver 29 is coupled to an IRD 30, one for each user, namely IRD1 , IRD2 ... IRD5 which, in turn, are connected to respective display units 31, which can be television or workstation monitors, namely DUl, DU2 ... DU5.
  • Each receiver unit 24 also has user responder 20, namely UR1, UR2 ... UR5, coupled to its respective IRD.
  • Each user responder 20 queries its respective IRD 30 to determine the transponder requested by the user- and encodes that information for transmission back to the transponder selectors in MUT 12.
  • the control data occupies a small band adjacent to the users' transponders in the communication channel.
  • MUT 12 has to distinguish among the control signals from the various users and direct them to the proper transponder selectors. It does this using conventional or other multiple access techniques.
  • Figs. 2 and 3 illustrate, respectively, user receivers 24 and MUT 12 and for the particular five user embodiment of the invention.
  • the embodiment depicted utilizes the U-NII communications band from 5150 to 5350 MHz.
  • the invention is not confined to using this frequency band.
  • Each user has a receiver unit 24 that receives the broadcast signal from MUT 12 and provides its IRD 30 with its transponder signal.
  • Each receiver unit 24 consists of two major integrated elements that are interfaced to the user's IRD 30, which, in turn, is coupled to a respective user display unit 31. Both of these elements are described in more detail below.
  • Each user has a receiver unit 24 which includes a receiver 29 coupled with antenna 28 (e.g., a 3" x 3" corner reflector U-NII user antenna or an omnidirectional antenna such as Mobile Mark N SCR14-5150) and circulator 27 (e.g., Narda Model No. 4914) that feeds the received broadcast signal to a frequency converter 50 through amplifier 52 (e.g., JCA Technology Model No. JCA048-F01). After conversion, the user's desired transponder is centered at the proper position in the DTH band.
  • Frequency converter 50 includes local oscillator 56 (e.g., Luff Research Model No.
  • SLSM2-38004300 coupled to down converter / mixer 54 (e.g., Mini-Circuits Laboratories Model No. ZMX- 7GLHR), low pass filter 58 (e.g., K & L Microwave Model No. 5IL41- 1500/T3000), and tunable local oscillator 62 (e.g., Luff Research Model No. SLSM2-5001500) coupled to up converter / mixer 60 (e.g., Mini-Circuits Laboratories Model No. ZLW-186MH).
  • Local oscillator 62 is tuned to the proper frequency by control signals from the user's responder 20.
  • tunable frequency sources from Luff Research that have a standard serial port interface are used.
  • the frequency output can be tuned in 1 MHz increments anywhere in the operation band. That port can be connected to a standard PC with a digital to analog interface card (DAC).
  • DAC digital to analog interface card
  • the transponder frequency in processor 64 e.g., a generic 486 class personal computer processor
  • its software can be programmed to set the voltages on the tunable local oscillator port to the correct settings.
  • the signal is then sent from receiver 29 to the user's IRD 30 (e.g., a Sony or HNS) for decoding and display on display unit 31 (e.g., a Sony television).
  • the IRD only needs a single transponder signal to get all of the channel guide information and the user's authorization codes. This capability is significant in making the system transparent to the user.
  • Responder 20 accesses information from IRD 30 as the user changes channels, and uses the information to create control signals.
  • One control signal is sent to frequency converter 50 in the user's receiver 29.
  • Responder 20 includes processor 64 which is coupled to modem 66 (e.g., BroadCom Corp. Model No. BCM 93133).
  • Modem 66 is coupled to frequency converter 68 which includes up- converter / mixer 70 (e.g., Mini-Circuits Laboratories Model No. ZLW-186MH) coupled to local oscillator 72 (e.g., Luff Research Model No. SLSM2-3800-4300) for upconverting to the U-NII band.
  • up- converter / mixer 70 e.g., Mini-Circuits Laboratories Model No. ZLW-186MH
  • local oscillator 72 e.g., Luff Research Model No. SLSM2-3800-4300
  • Frequency converter 68 passes the upconverted signal through bandpass filter 80 (e.g., K & L Microwave 5IB32- 5200/ T100) to amplifier 82 (e.g., JCA Technology Model Number JCA048-F01) which feeds the signal to circulator 27 for broadcast to MUT 12 by user antenna 28.
  • bandpass filter 80 e.g., K & L Microwave 5IB32- 5200/ T100
  • amplifier 82 e.g., JCA Technology Model Number JCA048-F01
  • selected transponder information is sent from user IRD 30 to responder 20. That information can come in two parts, for example, the first part containing the transponder number information, and the second part containing the transponder polarization.
  • the transponder number information can be represented as a voltage. That voltage is obtained by appending a standard frequency-to-voltage converter to the IRD's internal frequency synthesized local oscillator (LO).
  • LO local oscillator
  • the transponder polarization information is accessed as a voltage
  • the voltage is in the range from 16 to 19 volts, and when an odd-numbered transponder is selected, the voltage is in the range from 11 to 14 volts.
  • the user changes channels on the IRD, its internal LO frequency is adjusted accordingly to access the appropriate transponder signal.
  • the adjusted LO frequency signal is transmitted to its frequency-to-voltage converter and the voltage therefrom is sent to processor 64 in responder 20.
  • the voltage signal corresponding to the transponder polarization is received at processor 64 on a separate line (not shown).
  • the processor receives the signals at a two-channel analog-to-digital converter that allows the voltages to be accessed by the processor's software program (or embedded hardware programming).
  • the program determines the transponder number from the input voltages.
  • the polarization is also known (e.g., odd number transponders are left-hand circularly polarized; even number transponders are right-hand polarized) thereby requiring only one voltage to be transmitted from the IRD to the user-responder processor.
  • processor 64 determines the selected transponder number, it sends a bit stream to modem 66.
  • the bit stream contains the user id number and the encoded transponder number.
  • the amount of information sent is very small, typically less than twenty bits.
  • MUT 12 is shown in more detail.
  • MUT 12 can be installed in any central location where its broadcast signal can be accessed by all of the users. A convenient location would be near the Earth station antenna 14.
  • MUT 12 consists of three major integrated elements, namely, transponder selectors 16, transmitter 22 and transponder controller 18. Each of these elements are described in more detail below. 1.
  • the transponder selectors are described in more detail below. 1.
  • Transponder selector is abbreviated terminology for “transponder signal selector,” for it selects the signal from a single transponder from the multiple transponder signals included in the DTH signal received from the satellite.
  • the transponder selectors each receive DTH signal 10 from the satellite antenna 14, and downconverts it to an intermediate frequency so that the desired transponder signal is re-centered about a fixed intermediate frequency dedicated to that corresponding user. The unnecessary portion of the DTH signal is filtered out and the single transponder signal is sent to MUT transmitter 22.
  • Transponder selectors 16 each include an LNB selector 36 (a voltage-controlled L- band microwave switch), frequency converter 37 which has a down-converter mixer 40 coupled to tunable local oscillator 38, and a bandpass filter 41 (e.g. K&L Microwave Model 5TB32). Transponder selectors 16 are controlled by signals 34 from the MUT transponder controller 18 that determine which transponder signal should be output to the MUT transmitter for each user.
  • LNB selector 36 a voltage-controlled L- band microwave switch
  • frequency converter 37 which has a down-converter mixer 40 coupled to tunable local oscillator 38
  • a bandpass filter 41 e.g. K&L Microwave Model 5TB32
  • LNB low- noise block
  • tunable local oscillator 38 e.g., Luff Research frequency synthesizer PN SLSM2- 5501050
  • mixer 40 e.g., Mini-Circuits Laboratories Model ZMX-10G.
  • the intermediate frequencies for the five users could be situated at 400 MHz, 430 MHz ,460 MHz, 490 MHz and 520 MHz respectively.
  • the invention can be practiced by embodiments utilizing other sets of frequencies and accommodating other numbers of users.
  • Transmitter 22 bundles via multi-user combiner 43 (e.g., Narda four-way combiner Model No. 4311C-4) all of the selector signals into a reduced bandwidth package at the intermediate frequencies. It then upconverts them to the U-NII band, bandpass filters and amplifies the signal for transmission, using frequency converter 45 which includes up-converter / mixer 46 (e.g., Mini-Circuits Laboratories Model ZMX- 7GLHR) coupled to local oscillator 48 (e.g., Luff Research Model No. SLSM2- 38004300), bandpass filter 47 (e.g., K & L Microwave Model No. 51B32- 5275 T400), amplifier 49 (e.g., JCA Technology Model No.
  • up-converter / mixer 46 e.g., Mini-Circuits Laboratories Model ZMX- 7GLHR
  • local oscillator 48 e.g., Luff Research Model No. SLSM2- 38004300
  • Transmitter / controller antenna 26 can be a U-NII antenna, which is a small 3" x 3" corner reflector or an 18" long, 1.25"- diameter omnidirectional antenna (e.g., Mobile Mark N SCR14-5150).
  • Transponder controller 18 is abbreviated terminology for “transponder signal- selector controller,” for it controls a transponder selector (16) which in turn selects a transponder signal.
  • Transponder controller 18 includes amplifier 90 (e.g., JCA Technology Model No. JCA048-F01), frequency converter 91 which includes a down-converter / mixer 92 (e.g., Mini-Circuits Laboratories Model No. ZLMX- 7GLHR) coupled to local oscillator 93 (e.g., Luff Research Model No. SLSM2- 38004300), low-pass filter 94 (e.g., K&L Microwave Model No. 5IB32), demodulator 95 (e.g., BroadCom Corp.
  • amplifier 90 e.g., JCA Technology Model No. JCA048-F01
  • frequency converter 91 which includes a down-converter / mixer 92 (e.g., Mini-Circuits Laboratories Model No. ZLMX
  • Transponder controller 18 receives control signals from the user in a narrow frequency band that is adjacent to the users' transponder signals (See Fig. 4). Those signals are downconverted, demodulated, processed and sent as signals 34 to LNB selectors 36 and to the tunable local oscillators (frequency synthesizer) 38 in transponder selectors 16.
  • DTH Direct To Home
  • transponder signals can be selected from a DTH signal and sent on a wireless U-NII (5.15 - 5.35 GHz) link.
  • Fig. 4 shows a spectrum of 3 transponder signals.
  • a receiver can receive those transponder signals, and convert them back to the DTH band for successful signal viewing, for example, television viewing.
  • Control data can be sent simultaneously on the same U-NII band without interfering with the DTH signals. Likewise, the control data is received intact without interference from the DTH signals. (Fig. 4 shows the spectrum wherein the 3 transponder signals are combined with control data.)
  • the desired transponder can be selected for transmission by tuning the local oscillators in the transponder selector and the receiver.
  • the user has full access to the DTH program guide and authorization codes when only a single transponder signal is received at the IRD. This is significant for the user-transparent use of this distribution system.

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  • Physics & Mathematics (AREA)
  • Astronomy & Astrophysics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Radio Relay Systems (AREA)
  • Two-Way Televisions, Distribution Of Moving Picture Or The Like (AREA)

Abstract

Procédé et système permettant d'effectuer la distribution par signaux radiosatellite DTH (Direct to Home: directement à la maison) de services à une pluralité d'utilisateurs demandeurs de services. Un émetteur d'utilisateurs multiples est couplé à une antenne satellite terrestre afin de recevoir des signaux satellite de transpondeur pouvant être sélectionné. Cet émetteur comprend une pluralité de sélecteurs de transpondeur associés chacun, de préférence, à un utilisateur respectif et, même, affectés spécialement à cet utilisateur. Chaque utilisateur demandeur de service est pourvu d'un sélecteur de voie qu'il peut lui-même contrôler et qui sert à accéder aux signaux satellite de transpondeur. Ce sélecteur de voie est couplé à une unité d'affichage utilisateur respective et à un récepteur utilisateur respectif. Un répondeur, qui peut être le récepteur utilisateur, répond à un signal de voie sélectionné par l'utilisateur demandeur de service afin de transmettre un signal de sélection de transpondeur à l'émetteur d'utilisateurs multiples. Ce signal contient des informations indiquant un signal satellite souhaité de transpondeur, devant être transmis à l'utilisateur demandeur de service associé au signal de voie respectif (normalement sélectionné par l'utilisateur). L'émetteur d'utilisateurs multiples transmet les signaux sélectionnés de transpondeur satellite à chacun de la pluralité des utilisateurs demandeurs de services en réponse aux signaux de sélection de transpondeur, ce qu'il peut effectuer par radiodiffusion. Le signal souhaité de transpondeur satellite est alors couplé au récepteur d'utilisateur demandeur de service (qui peut contenir le sélecteur de voie pouvant être contrôlé par l'utilisateur) afin d'être affiché par l'unité d'affichage utilisateur respective.
EP00932135A 1999-05-05 2000-05-04 Distribution sans fil de services dth sur une voie presentant une largeur de bande limitee Withdrawn EP1177647A2 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US30589599A 1999-05-05 1999-05-05
US305895 1999-05-05
PCT/US2000/012401 WO2000067401A2 (fr) 1999-05-05 2000-05-04 Distribution sans fil de services dth sur une voie presentant une largeur de bande limitee

Publications (1)

Publication Number Publication Date
EP1177647A2 true EP1177647A2 (fr) 2002-02-06

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EP00932135A Withdrawn EP1177647A2 (fr) 1999-05-05 2000-05-04 Distribution sans fil de services dth sur une voie presentant une largeur de bande limitee

Country Status (6)

Country Link
EP (1) EP1177647A2 (fr)
JP (1) JP2002543739A (fr)
CN (1) CN1355970A (fr)
AU (1) AU4990400A (fr)
RU (1) RU2001132730A (fr)
WO (1) WO2000067401A2 (fr)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20050229228A1 (en) * 2004-04-07 2005-10-13 Sandeep Relan Unicast cable content delivery
DE102004063785A1 (de) * 2004-12-30 2006-07-13 Schmidt, Hans-Jürgen, Dipl.-Ing. Funkferngesteuerte Rundfunkempfangseinheit
CN101123695B (zh) * 2006-08-07 2010-12-15 石方太 有线电视网“窄带入户”传输方法
KR102281044B1 (ko) * 2020-12-24 2021-07-23 이호영 송신기 및 수신기의 대화가 가능한 디지털 위성방송 시스템 및 그 디지털 위성방송 송수신방법
KR102281042B1 (ko) * 2020-12-24 2021-07-23 이호영 응답신호의 리턴이 가능한 디지털 위성방송 시스템 및 그 디지털 위성방송 송수신방법

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Publication number Priority date Publication date Assignee Title
DE29607742U1 (de) * 1996-04-29 1996-07-25 Wohlmeiner Dietmar Funkbetriebenes Satellitenempfangssystem
DE29816481U1 (de) * 1998-09-15 1999-02-11 Technisat Satellitenfernsehpro Schaltmatrix zur Verteilung von mehreren Satellitensignalen auf mehrere Teilnehmer
DE29903217U1 (de) * 1999-02-23 1999-05-12 Technisat Satellitenfernsehpro Drahtlose Satellitenempfangsanlage

Non-Patent Citations (1)

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Title
See references of WO0067401A3 *

Also Published As

Publication number Publication date
AU4990400A (en) 2000-11-17
WO2000067401A9 (fr) 2002-07-11
WO2000067401A3 (fr) 2001-01-25
JP2002543739A (ja) 2002-12-17
WO2000067401A2 (fr) 2000-11-09
CN1355970A (zh) 2002-06-26
RU2001132730A (ru) 2003-07-20

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