WO2005069495A1 - Outside unit for satellite reception and method of reception with said unit - Google Patents
Outside unit for satellite reception and method of reception with said unit Download PDFInfo
- Publication number
- WO2005069495A1 WO2005069495A1 PCT/EP2004/053477 EP2004053477W WO2005069495A1 WO 2005069495 A1 WO2005069495 A1 WO 2005069495A1 EP 2004053477 W EP2004053477 W EP 2004053477W WO 2005069495 A1 WO2005069495 A1 WO 2005069495A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- band
- frequencies
- frequency
- transposition
- ghz
- Prior art date
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N7/00—Television systems
- H04N7/20—Adaptations for transmission via a GHz frequency band, e.g. via satellite
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/38—Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving
- H04B1/40—Circuits
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/12—Supports; Mounting means
- H01Q1/22—Supports; Mounting means by structural association with other equipment or articles
- H01Q1/24—Supports; Mounting means by structural association with other equipment or articles with receiving set
- H01Q1/247—Supports; Mounting means by structural association with other equipment or articles with receiving set with frequency mixer, e.g. for direct satellite reception or Doppler radar
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q23/00—Antennas with active circuits or circuit elements integrated within them or attached to them
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/06—Receivers
-
- 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
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03D—DEMODULATION OR TRANSFERENCE OF MODULATION FROM ONE CARRIER TO ANOTHER
- H03D7/00—Transference of modulation from one carrier to another, e.g. frequency-changing
- H03D7/16—Multiple-frequency-changing
- H03D7/161—Multiple-frequency-changing all the frequency changers being connected in cascade
Definitions
- the invention pertains to an outside unit for satellite reception and to a method of reception with the said unit.
- the invention is aimed at improving problems of interference with coexisting communication systems.
- LNBs Low Noise Blocks
- the said units are generally placed at the centre of a parabolic reflector which focuses the waves.
- a unit generally comprises a source which transforms the electromagnetic waves into an electrical signal and then the signals are amplified and transposed to an intermediate frequency band so as to be sent to an inside unit, for example a television programme decoder, by way of a coaxial cable.
- the useful satellite band lies between 10.7 GHz and 12.75 GHz.
- Outside units are made to receive the whole of this frequency band according to a horizontal polarization and a vertical polarization.
- the intermediate band used lies between 950 and 2150 MHz.
- the outside units divide the reception band into four subbands each corresponding to half the satellite band for each of the polarizations. Selection of the band is done for example with the aid of commands sent by the inside unit to the outside unit via . the coaxial cable according to the DiSEqC standard.
- the separation of the satellite band into two subbands is done by using a transposition signal which can take two frequency values which are conventionally 9.75 GHz and 10.6 GHz. With these two transposition frequencies, the part of the satellite band lying between 10.7 and 11.7 GHz gets transposed between 950 and 1950 MHz and the frequency band lying between 11.7 and 12.75 GHz gets transposed between 1100 and 2150 MHz. Problems of interference with other transmission devices may arise, in particular with wireless digital telephones.
- the DECT standard provides for the use of a frequency band lying between 1881 and 1898 MHz in Europe and between 1897 and 1914 MHz in the United States.
- this frequency band gets placed in the satellite intermediate band, thereby necessitating appropriate shielding so as not to disturb the reception of the programmes that are transposed to this part of the satellite intermediate band.
- the problem of shielding is all the greater when the decoder comprises a transmitter/receiver operating in the DECT band so as to be linked to a telephone line via a DECT telephone base or when the decoder itself includes a DECT telephone base.
- the invention proposes to solve the problem of interference by using a less expensive technique which hardly modifies the known structure of an outside unit of LNB type.
- the invention proposes an LNB using two transposition frequencies chosen on either side of the reception band so as to obtain a transposition of supradyne type and a transposition of infradyne type according to the frequency used.
- This choice of transposition frequencies makes it possible to have an overlap zone in the middle of the reception band which is transposed with the aid of the two oscillation frequencies but at different frequencies. This makes it possible to choose between the two transpositions in the case where the frequency transposed with the aid of an oscillator corresponds to a particularly noisy frequency.
- the invention is an outside unit for receiving waves originating from a satellite, the unit comprising means of amplification and means of transposition using two transposition frequencies to transpose a satellite reception band to an intermediate frequency band of smaller size than the size of the reception band.
- the two transposition frequencies are such that a part of the satellite reception band is transposed to the intermediate frequency band in an infradyne manner by using one of the transposition frequencies and another part of the satellite reception band is transposed to the intermediate frequency band in a supradyne manner by using the other of the transposition frequencies.
- the two transposition frequencies are chosen so that there exists an intersection common to the two parts of the band of the satellite reception band which is transposed to the intermediate band with the aid of each of the two oscillators with a spectrum inverted on itself.
- the invention is also a method of receiving a radio signal originating from a satellite in a satellite reception band with the aid of an outside unit having means of amplification and means of transposition using two transposition frequencies to transpose a satellite reception band to an intermediate frequency band of smaller size than the size of the reception band.
- the reception band is separated, for a given polarization, into at least four subbands of increasing frequencies and two adjacent subbands are transposed with the aid of two different transposition frequencies.
- one of the transposition frequencies is situated at a frequency below the bottom frequency of the satellite reception band from which is subtracted the bottom frequency of the intermediate band.
- the other of the frequencies is situated at a frequency above the upper frequency of the satellite reception band to which is added the base frequency of the intermediate band.
- Figure 1 represents the structure of an LNB in accordance with the present invention
- Figure 2 presents a first example of transposition according to the invention
- Figure 3 presents a second example of transposition according to the invention.
- Figure 1 represents an outside unit 1 (hereinafter called LNB) implementing the invention.
- the LNB 1 comprises a source 100, for example a horn, which receives the waves originating from the reflection on a parabolic dish (not represented).
- the waves received by the source 100 are transformed by a transition zone 101 into two electrical signals H and V representative of the waves received respectively under horizontal and vertical polarization.
- Two low noise amplifiers 102 and 103 respectively amplify each of the electrical signals H and V.
- a switch 104 selects the output of one of the two low noise amplifiers 102 and 103 so as to supply the signal to transposition means.
- the transposition means comprise a first bandpass filter 105 coupled to an amplifier 106 so as to amplify the signal selected in the reception band of the LNB 1, for example the band lying between 10.7 GHz and 12.75 GHz.
- the transposition means comprise a mixer 107 which mixes the signal originating from the first filter 105 with a transposition signal.
- the transposition signal is supplied in the example described by two oscillators 108 and 109, only one of which is energized so as to have a transposition signal of fixed frequency chosen from among two frequencies.
- An amplifier 110 coupled to a second bandpass filter 111 amplifies the signal originating from the mixer and selects a passband corresponding to an intermediate frequency band, for example lying between 950 and 2150 MHz, so as to supply a transposed signal in the intermediate band to an input/output terminal of the LNB 1 , into which a coaxial cable (not represented) is plugged.
- the LNB 1 also comprises a lowpass filter 112 linked to the input/output terminal so as to extract the power supply to the LNB and the control signals originating from a distant inside unit (not represented).
- a drive and power supply circuit 113 is connected to the lowpass filter 112.
- the drive and power supply circuit provides a voltage to all the elements of the LNB 1 , selectively for the oscillators 108 and 109 so that just one operates.
- the drive and power supply circuit 113 also provides the switch 104 with a control signal so as to select the polarization desired by the inside unit.
- the control signals sent by the inside unit are for example signals coded according to the DiSEqC standard.
- the exemplary embodiment shows two oscillators, only one of which is energized. It is possible to have a single oscillator capable of providing both frequencies as a function of a control signal.
- the reception band 200 lying between 10.7 GHz and 12.75 GHz is separated into first to third subbands 201 to 203, the first subbband 201 lying between 10.7 and 11.55 GHz, the second subband 202 lying between 11.55 and 11.9 GHz and the third subband lying between 11.9 and 12.75 GHz.
- the first and second subbands 201 and 202 are transposed simultaneously and in an infradyne manner to the intermediate band between 950 and 2150 MHz with the aid of the oscillator of frequency 9.75 GHz, this transposition is represented by the band 204.
- the second and third subbands 202 and 203 are transposed simultaneously and in a supradyne manner to the intermediate band between 950 and 2150 MHz with the aid of the oscillator of frequency 13.7 GHz, this transposition is represented by the band 205.
- the band is represented in an inverted manner for better comprehension since the effect of the supradyne transposition is to invert the spectrum.
- the person skilled in the art appreciates that the second subband 202 is transposed with the two oscillators to a portion of the intermediate band which lies between 1800 and 2150 MHz.
- the inversion of the spectrum poses no problem at the signal demodulation level since the demodulators used for satellite transmission are designed to perform an inversion of the demodulated channel, if necessary.
- the DECT band is represented in black on the transposed intermediate bands 204 and 205 and it may be seen that the noisy DECT band for a transposition carried out with an oscillator corresponds to a non-noisy band lying between 2036 and 2069 MHz for the transposition carried out with the aid of the other oscillator.
- the limit of splitting of the transposition arises if the transposition frequencies are chosen so as to be spaced too far apart with respect to the reception band.
- the maximum limit of spacing between the oscillation frequencies is fixed by the width of the reception band, for example 2050 MHz, to which is added twice the bottom frequency of the intermediate band, that is to say twice 950 MHz, and to which is also added the difference, obtained with the example of Figure 2, between the upper bound of the intermediate band which is 2150 MHz and the transposed upper band of the non-noisy band corresponding to a noisy band, that is to say 2069 MHz, i.e. 81 MHz.
- the GSM band lying between 935 and 960 MHz. This band overlaps the intermediate band on the bottom part lying between 950 and 960 MHz.
- the GSM band may be disturbing when a GSM base station is situated in proximity to an LNB. Although less troublesome than the DECT band should a DECT apparatus be included in the inside unit, this GSM band may also be eliminated.without any problem by shifting the oscillation frequencies. .•;,, It is possible to provide a safety margin around the DECT and GSM bands so as to be sure of not encroaching on a channel situated at the limit of the intermediate band.
- the example of Figure 3 corresponds to a preferred example which circumvents the DECT and GSM bands while preserving a safety margin.
- the transposition frequencies are for example fixed at 9.72 GHz and 13.73 GHz.
- the reception band 300 lying between 10.7 GHz and 12.75 GHz is divided up as in the previous example into three subbands, the first lying between 10.7 and 11.58 GHz, the second lying between 11.55 and 11.87 GHz and the third lying between 11.87 and 12.75 GHz.
- the first and second subbands are transposed simultaneously and in an infradyne manner to the intermediate band between 980 and 2150 MHz with the aid of the oscillator of frequency 9.72 GHz.
- the second and third subbands are transposed simultaneously and in a supradyne manner to the intermediate band between 980 and 2150 MHz with the aid of the oscillator of frequency 13.73 GHz.
- the band is represented in an inverted manner for better comprehension since the effect of the supradyne transposition is to invert the spectrum.
- the portion of the intermediate band which lies between 1860 and 2150 MHz and which is transposed with the aid of the two oscillators is of more reduced size but sufficient to circumvent the DECT band as explained previously, the image of the DECT band being located between 2106 MHz and 2129 MHz.
- the useful spectral width of the intermediate band is also reduced over its bottom part in order to distance it from the GSM band and to circumvent any interference problem related to this band.
- the frequency transposition differs from the state of the art without however requiring any significant change at the level of the inside unit. Specifically, the scanning of the satellite band is performed in an alternate manner. With the aid of Figure 3, the method of transposition will now be detailed.
- the reception band 300 is divided into first to fourth subbands 301 to 304.
- the first subband 301 lies between 10.7 and 11.58 GHz, this first subband is transposed with the aid of the 9.72 GHz transposition frequency since there are no other possibilities.
- the second subband 302 lies between 11.58 and 11.725 GHz, this second subband 302 is transposed with the aid of the 13.73 GHz transposition frequency so as to circumvent problems related to the DECT band which would arise if the 9.72 GHz frequency were used.
- the third subband 303 lies between 11.725 and 11.87 GHz, this third subband 303 is transposed with the aid of the 9.72 GHZ* transposition frequency so as to circumvent problems related to the DECT band which would arise if the 13.73 GHz frequency were used.
- the fourth subband 304 lies between 11.87 and 12.75 GHz, this fourth subband 304 is transposed with the aid of the 13.73 GHz transposition frequency since there are no other possibilities.
- the size of the second and third subbands 302 and 303 may vary since their widths are greater than the bands. It is also possible to make two adjacent subbands overlap slightly so as to be sure that the slicing of the reception band into subbands does not occur exactly in the middle of a transmitted channel.
- the person skilled in the art will understand that the separation into four subbands, with the transposition frequencies as defined, corresponds to the minimum separation to be effected in order to circumvent the DECT band. In the example chosen, the transposition frequencies are chosen symmetrically with respect to the reception band.
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- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Physics & Mathematics (AREA)
- Astronomy & Astrophysics (AREA)
- General Physics & Mathematics (AREA)
- Computer Networks & Wireless Communication (AREA)
- Radar, Positioning & Navigation (AREA)
- Remote Sensing (AREA)
- Multimedia (AREA)
- Input Circuits Of Receivers And Coupling Of Receivers And Audio Equipment (AREA)
- Superheterodyne Receivers (AREA)
- Noise Elimination (AREA)
Abstract
Description
Claims
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2006548192A JP4751834B2 (en) | 2004-01-06 | 2004-12-15 | External unit for satellite reception and reception method using the unit |
CN2004800399270A CN1902829B (en) | 2004-01-06 | 2004-12-15 | Outside unit for satellite reception and method of reception with said unit |
EP04804832.6A EP1704650B1 (en) | 2004-01-06 | 2004-12-15 | Outside unit for satellite reception and method of reception with said unit |
US10/584,650 US7831197B2 (en) | 2004-01-06 | 2004-12-15 | Outside unit for satellite reception and method of reception with said unit |
KR1020067013288A KR101092575B1 (en) | 2004-01-06 | 2004-12-15 | Outside unit for satellite reception and method of reception with said unit |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR0400070A FR2864877A1 (en) | 2004-01-06 | 2004-01-06 | Low noise block for use with parabolic reflector, has transposition unit for transposing sub-bands of satellite reception band in intermediate frequency band of infra-dyne type and supra-dyne type |
FR0400070 | 2004-01-06 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2005069495A1 true WO2005069495A1 (en) | 2005-07-28 |
Family
ID=34673855
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/EP2004/053477 WO2005069495A1 (en) | 2004-01-06 | 2004-12-15 | Outside unit for satellite reception and method of reception with said unit |
Country Status (7)
Country | Link |
---|---|
US (1) | US7831197B2 (en) |
EP (1) | EP1704650B1 (en) |
JP (1) | JP4751834B2 (en) |
KR (1) | KR101092575B1 (en) |
CN (1) | CN1902829B (en) |
FR (1) | FR2864877A1 (en) |
WO (1) | WO2005069495A1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2010031944A1 (en) * | 2008-09-19 | 2010-03-25 | France Telecom | Method for processing two signals received by a single terminal |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1997023052A1 (en) * | 1995-12-15 | 1997-06-26 | Pace Micro Technology Ltd. | Improvements relating to the processing of broadcasting signals |
EP1198066A2 (en) * | 2000-10-11 | 2002-04-17 | Pace Micro Technology PLC | Avoidance of interfernce between items of electrial apparatus |
Family Cites Families (13)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH03210825A (en) * | 1990-01-16 | 1991-09-13 | Toshiba Corp | Superheterodyne receiver |
JPH06284033A (en) * | 1993-03-29 | 1994-10-07 | Toshiba Corp | Radio communication system of digital cordless telephone system or the like |
JPH1155139A (en) * | 1997-08-06 | 1999-02-26 | Hitachi Denshi Ltd | Radio equipment |
GB9818397D0 (en) * | 1998-08-25 | 1998-10-21 | Philips Electronics Nv | Low if receiver |
FR2810173A1 (en) * | 2000-06-08 | 2001-12-14 | Thomson Multimedia Sa | RADIO FREQUENCY TRANSMISSION AND / OR RECEPTION DEVICE |
JP3680927B2 (en) * | 2000-11-27 | 2005-08-10 | シャープ株式会社 | Converter for satellite broadcasting reception |
FR2822000B1 (en) * | 2001-03-08 | 2003-05-23 | Thomson Multimedia Sa | TRANSMISSION DEVICE LIMITING PARASITES OUTSIDE THE ALLOCATED FREQUENCY BAND |
JP4171869B2 (en) * | 2001-09-05 | 2008-10-29 | ソニー株式会社 | Heterodyne receiver |
JP2003188753A (en) * | 2001-12-18 | 2003-07-04 | Sharp Corp | Digital satellite broadcast receiving tuner |
FR2841067A1 (en) * | 2002-06-18 | 2003-12-19 | Thomson Licensing Sa | External unit for use in subscriber side of transmission system, synchronizes local oscillator using reference subcarrier placed in transmission frequency band, by transposing transposed subcarrier into desired frequency span |
FR2842370B1 (en) * | 2002-07-10 | 2004-09-17 | Thomson Licensing Sa | MICROWAVE ADAPTER FOR CABLE NETWORK |
AU2003279479A1 (en) * | 2002-12-13 | 2004-07-09 | Koninklijke Philips Electronics N.V. | Tunable tracking filter |
FR2884983A1 (en) * | 2005-04-25 | 2006-10-27 | Thomson Licensing Sa | BROADBAND DEPHASING DEVICE |
-
2004
- 2004-01-06 FR FR0400070A patent/FR2864877A1/en active Pending
- 2004-12-15 EP EP04804832.6A patent/EP1704650B1/en not_active Expired - Fee Related
- 2004-12-15 CN CN2004800399270A patent/CN1902829B/en not_active Expired - Fee Related
- 2004-12-15 JP JP2006548192A patent/JP4751834B2/en not_active Expired - Fee Related
- 2004-12-15 KR KR1020067013288A patent/KR101092575B1/en active IP Right Grant
- 2004-12-15 WO PCT/EP2004/053477 patent/WO2005069495A1/en active Application Filing
- 2004-12-15 US US10/584,650 patent/US7831197B2/en not_active Expired - Fee Related
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1997023052A1 (en) * | 1995-12-15 | 1997-06-26 | Pace Micro Technology Ltd. | Improvements relating to the processing of broadcasting signals |
EP1198066A2 (en) * | 2000-10-11 | 2002-04-17 | Pace Micro Technology PLC | Avoidance of interfernce between items of electrial apparatus |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2010031944A1 (en) * | 2008-09-19 | 2010-03-25 | France Telecom | Method for processing two signals received by a single terminal |
Also Published As
Publication number | Publication date |
---|---|
KR101092575B1 (en) | 2011-12-13 |
US20090291655A1 (en) | 2009-11-26 |
KR20060123418A (en) | 2006-12-01 |
EP1704650B1 (en) | 2014-02-26 |
JP2007520119A (en) | 2007-07-19 |
FR2864877A1 (en) | 2005-07-08 |
EP1704650A1 (en) | 2006-09-27 |
JP4751834B2 (en) | 2011-08-17 |
US7831197B2 (en) | 2010-11-09 |
CN1902829B (en) | 2010-05-26 |
CN1902829A (en) | 2007-01-24 |
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