WO1996005661A1 - Faisceau hertzien - Google Patents

Faisceau hertzien Download PDF

Info

Publication number
WO1996005661A1
WO1996005661A1 PCT/GB1995/001959 GB9501959W WO9605661A1 WO 1996005661 A1 WO1996005661 A1 WO 1996005661A1 GB 9501959 W GB9501959 W GB 9501959W WO 9605661 A1 WO9605661 A1 WO 9605661A1
Authority
WO
WIPO (PCT)
Prior art keywords
signal
local oscillator
transmitter
receiver circuit
frequency
Prior art date
Application number
PCT/GB1995/001959
Other languages
English (en)
Inventor
David Alexander Cowan
Bharat Patel
Original Assignee
Nera Limited
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 Nera Limited filed Critical Nera Limited
Priority to AU32300/95A priority Critical patent/AU3230095A/en
Publication of WO1996005661A1 publication Critical patent/WO1996005661A1/fr

Links

Classifications

    • 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
    • H03D7/163—Multiple-frequency-changing all the frequency changers being connected in cascade the local oscillations of at least two of the frequency changers being derived from a single oscillator
    • 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
    • H04B1/50—Circuits using different frequencies for the two directions of communication

Definitions

  • Microwave radio systems are known in which each station uses a common antenna for transmitting and receiving signals.
  • a transmitter/receiver circuit serves to "upconvert" the signal to be transmitted from a low carrier frequency to an appropriate microwave carrier frequency, and serves to "downconvert" the received signal to an appropriate low carrier frequency.
  • Licensed frequency bands are generally split between upper and lower half bands: in an intercommunicating pair of stations, one station transmits in the upper half band and receives in the lower half band; correspondingly, because the transmit frequency of each station is the receive frequency of the other, the second station of the pair receives in the upper half band and transmits in the lower half band.
  • the transmit and receive frequencies are offset by a constant amount, known as the duplex frequency.
  • each station of a microwave radio system uses a common microwave local oscillator synthesiser for the final upconversion stage of the transmitted signal and the initial downconversion stage of the received signal.
  • the synthesisers in the two stations run at significantly different frequencies and are of different designs, arranged so that the intermediate frequencies in the respective transmit and receive signal paths remain constant.
  • Known circuits are further complicated in requiring as many as five local oscillators in each station to provide the necessary upconversion and downconversion of the signals being transmitted and received: often a sixth local oscillator is required in order to provide a built-in loop test function.
  • a transmitter/receiver circuit for a microwave radio station comprising a signal path for upconverting a signal for transmission from an antenna and a signal path for downconverting a signal received on said antenna, and a local oscillator circuit: providing a first IF local oscillator signal equal to the duplex frequency and a second IF local oscillator signal equal to twice the duplex frequency, the two IF oscillator signals being applied to respective mixers in the upconverting and downconverting signal paths or vice versa.
  • one station uses the IF local oscillator signal of twice duplex frequency in the upconverting (transmitting) signal path, and the IF local oscillator frequency equal to the duplex frequency in the downconverting (receiving) signal path.
  • the other station uses the duplex frequency as IF local oscillator signal in the upconverting path and the twice-duplex frequency as IF local oscillator signal in the downconverting path.
  • a common microwave local oscillator synthesiser is used for the final upconversion stage of the transmitted signal and the initial downconversion stage of the received signal.
  • the local oscillator synthesiser runs at the same frequency in both stations and is preferably of the same design.
  • the synthesiser frequency tuning bandwidth needs to be only half that of the licensed band in order to cover the full band.
  • the IF local oscillator signals are generated from a single oscillator, for example from an oscillator running at twice the duplex spacing, a divide-by-two circuit providing the duplex frequency signal.
  • This duplex frequency signal may also be used for a loop-test circuit of the station, where such a loop-test function is required.
  • one of the IF local oscillator signals may be used as a microwave reference for the SHF synthesiser.
  • a final downconversion stage may use a separate local oscillator, or a signal divided from the above-described IF local oscillator.
  • the local oscillator frequency may be that required for the final downconversion stage, with a multiplier providing the IF local oscillator signals.
  • the transmitter/receiver circuit of this invention requires fewer local oscillators than hitherto known arrangements. It is a further advantage that the SHF synthesiser is the same in both stations and can be of relatively simple design.
  • the signal transmitter/receiver circuit of one station of a microwave radio system comprises an identical pair of such stations.
  • the circuit which is shown is housed in an outdoor or antenna unit and has a microwave port MP coupled to a transmit/receive microwave antenna: in the example which is shown, the circuit includes a multiplexer CM which is connected over a coaxial cable to an indoor unit (not shown) which provides the customer or user interface.
  • the indoor unit passes signals to be transmitted to the multiplexer CM and these signals are upconverted, in a signal path 10, for application to the common transmit/receive antenna via a diplexer 15. Signals received by this antenna are downconverted, in a signal path 20, and passed via multiplexer CM and the coaxial cable, to the indoor unit.
  • Each of the signal paths 10,20 includes various amplifier stages, filters and gain control arrangements, which have been omitted from the drawing for the sake of simplicity.
  • transmit signal path 10 includes mixers Ml and M2 for the frequency upconversion
  • receive signal path 20 includes mixers M3 , M4 and M5 for the frequency downconversion.
  • the intermediate frequency circuits are broadband, but are made frequency selective by bandpass filters BP1 and BP2 in the transmit and receive signal paths.
  • the transmit/receive circuit further comprises a local oscillator 12 having a divide-by-two divider circuit 14 connected to its output.
  • the output frequency of local oscillator 12 is twice the duplex spacing (i.e. the difference between the frequencies of the radio signals transmitted from and received at the port MP) , and the frequency of the output from divider circuit 14 is therefore equal to the duplex spacing.
  • a change-over switch 13 applies either the output of oscillator 12 to mixer Ml and the output of divider circuit 14 to mixer M4 , or the output of divider circuit 14 to mixer Ml and the output of oscillator 12 to mixer M4 , as will be described.
  • the transmit/receive circuit further comprises a microwave local oscillator synthesiser 16, based on a voltage controlled oscillator 17, providing a super high frequency (SHF) signal of selected frequency, for example within the range of 35.5915 to 36.7045 GHz: this super high frequency signal is applied via a splitter 18 to mixers M2 and M3.
  • SHF super high frequency
  • the transmit/receive circuits of the two intercommunicating stations of the radio system are identical.
  • the transmit signal frequency of one station is the receive signal frequency of the other station, and vice-versa: one station transmits in the upper half band and receives in the lower half band, whilst the other station receives in the upper half band and transmits in the lower half band.
  • the station which is shown transmits in the upper half band and receives in the lower half band, with a duplex spacing of 1260 MHz (the oscillator 12 running at 2520 MHz) .
  • a signal to be transmitted is passed from the indoor unit to the outdoor unit on a carrier frequency of 210 MHz, then upconverted at mixer Ml (fed with 2520 MHz from oscillator 12) to an intermediate frequency IF, of 2730 MHz.
  • the signal is further upconverted at mixer M2 : suppose that the synthesiser 16 is running at a selected frequency of 35.87 GHz, then the microwave transmit frequency will be 38.60 GHz.
  • the received signal frequency will be 37.34 GHz: this is downconverted at mixer M3 , also fed with the SHF signal of 35.87 GHz from synthesiser 16, to an intermediate frequency IF r of 1470 MHz; mixer M4 is fed with an 1260 MHz from divider circuit 14, to downconvert the signal to a carrier frequency of 210 MHz.
  • the received signal is downconverted to 70 MHz by a mixer M5 which is fed with a 280 MHz local oscillator signal provided by a separate local oscillator.
  • Bandpass filter BP1 is centred at the transmit IF frequency of 2730 MHz and filter BP2 is tuned to the receive IF frequency of 1470 MHz.
  • the synthesiser runs at the same selected frequency, but the change-over switch 13 is used in its alternative state (i.e. the local oscillator frequency of 2520 MHz is used for the received signal downconversion and the divided local oscillator frequency of 1260 MHz is used for the transmitted signal upconversion) .
  • the bandpass filters BP1 and BP2 are exchanged so that the transmit IF filter is at 1470 MHz and the receive filter is at 2730 MHz
  • the output from the IF local oscillator 12 may be used as a reference for the synthesiser 16. Further, the duplex frequency may be used (from the divider circuit 14) as local oscillator signal for a mixer M6 in a loop-test circuit.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Transmitters (AREA)
  • Transceivers (AREA)

Abstract

Circuit émetteur/récepteur pour un station de faisceau hertzien, qui comprend un parcours de signal (10) destiné à transposer par montée en fréquence un signal pour la transmission à partir d'une antenne et un second parcours (20) de signal destiné à transposer par abaissement de fréquence un signal reçu sur l'antenne. Un seul oscillateur local (12) fonctionne à deux fois la fréquence duplex et est utilisé pour fournir les signaux pour la transposition par montée en fréquence et par abaissement de fréquence: le signal d'oscillateur est utilisé directement pour la transposition par montée en fréquence et est divisé en deux pour la transmission par abaissement de fréquence. Un synthétiseur (17) d'oscillateur local effectue l'étape finale de transposition par montée en fréquence du signal transmis et l'étape initiale de transposition par abaissement de fréquence du signal reçu. Ainsi la configuration est simple et nécessite moins d'oscillateurs locaux que les dispositifs de l'art antérieur. En outre, les synthétiseurs d'oscillateur local pour deux stations de radio communicantes peuvent présenter la même conception relativement simple.
PCT/GB1995/001959 1994-08-17 1995-08-17 Faisceau hertzien WO1996005661A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU32300/95A AU3230095A (en) 1994-08-17 1995-08-17 Microwave radio system

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB9416637.8 1994-08-17
GB9416637A GB2292502B (en) 1994-08-17 1994-08-17 Microwave radio system

Publications (1)

Publication Number Publication Date
WO1996005661A1 true WO1996005661A1 (fr) 1996-02-22

Family

ID=10759991

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB1995/001959 WO1996005661A1 (fr) 1994-08-17 1995-08-17 Faisceau hertzien

Country Status (3)

Country Link
AU (1) AU3230095A (fr)
GB (1) GB2292502B (fr)
WO (1) WO1996005661A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU678915B2 (en) * 1995-06-05 1997-06-12 Mitsubishi Denki Kabushiki Kaisha Transmitter-receiver
GB2312573A (en) * 1996-04-25 1997-10-29 Samsung Electronics Co Ltd A radio communication system
US10828802B2 (en) 2013-02-01 2020-11-10 Sabic Global Technologies B.V. Methods for treatment and manufacture of pellets

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2842370B1 (fr) * 2002-07-10 2004-09-17 Thomson Licensing Sa Adaptateur hyperfrequence pour reseau cable

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4231116A (en) * 1978-03-27 1980-10-28 Hitachi, Ltd. Radio station system
US4489413A (en) * 1982-07-19 1984-12-18 M/A-Com Dcc, Inc. Apparatus for controlling the receive and transmit frequency of a transceiver
EP0246658A2 (fr) * 1986-05-23 1987-11-25 Nec Corporation Appareil émetteur récepteur
US5239689A (en) * 1990-10-25 1993-08-24 Sony Corporation Transmitter/receiver apparatus with common oscillator that changes frequency between transmitting and received operations

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4685099A (en) * 1982-05-19 1987-08-04 Maxon Electronics Co. Ltd. Method and apparatus for duplex communications

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4231116A (en) * 1978-03-27 1980-10-28 Hitachi, Ltd. Radio station system
US4489413A (en) * 1982-07-19 1984-12-18 M/A-Com Dcc, Inc. Apparatus for controlling the receive and transmit frequency of a transceiver
EP0246658A2 (fr) * 1986-05-23 1987-11-25 Nec Corporation Appareil émetteur récepteur
US5239689A (en) * 1990-10-25 1993-08-24 Sony Corporation Transmitter/receiver apparatus with common oscillator that changes frequency between transmitting and received operations

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU678915B2 (en) * 1995-06-05 1997-06-12 Mitsubishi Denki Kabushiki Kaisha Transmitter-receiver
US5689819A (en) * 1995-06-05 1997-11-18 Mitsubishi Denki Kabushiki Kaisha Transmitter-receiver
GB2312573A (en) * 1996-04-25 1997-10-29 Samsung Electronics Co Ltd A radio communication system
GB2312573B (en) * 1996-04-25 1998-12-30 Samsung Electronics Co Ltd Radio communication system
CN1079005C (zh) * 1996-04-25 2002-02-06 三星电子株式会社 无线电通信系统的频率发生器
US10828802B2 (en) 2013-02-01 2020-11-10 Sabic Global Technologies B.V. Methods for treatment and manufacture of pellets

Also Published As

Publication number Publication date
GB9416637D0 (en) 1994-10-12
GB2292502A (en) 1996-02-21
AU3230095A (en) 1996-03-07
GB2292502B (en) 1998-07-15

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