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WO2000031886A1 - Emetteur-recepteur - Google Patents

Emetteur-recepteur Download PDF

Info

Publication number
WO2000031886A1
WO2000031886A1 PCT/GB1999/003865 GB9903865W WO0031886A1 WO 2000031886 A1 WO2000031886 A1 WO 2000031886A1 GB 9903865 W GB9903865 W GB 9903865W WO 0031886 A1 WO0031886 A1 WO 0031886A1
Authority
WO
WIPO (PCT)
Prior art keywords
switch
transceiver
signal
frequency band
frequency
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.)
Ceased
Application number
PCT/GB1999/003865
Other languages
English (en)
Inventor
John Howard Waterhouse
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.)
Central Research Laboratories Ltd
Original Assignee
Central Research Laboratories Ltd
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 Central Research Laboratories Ltd filed Critical Central Research Laboratories Ltd
Publication of WO2000031886A1 publication Critical patent/WO2000031886A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • 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
    • H04B1/005—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 adapting radio receivers, transmitters andtransceivers for operation on two or more bands, i.e. frequency ranges
    • 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
    • H04B1/005—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 adapting radio receivers, transmitters andtransceivers for operation on two or more bands, i.e. frequency ranges
    • H04B1/0096—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 adapting radio receivers, transmitters andtransceivers for operation on two or more bands, i.e. frequency ranges where a full band is frequency converted into another full band
    • 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
    • H04B1/16—Circuits
    • H04B1/26—Circuits for superheterodyne receivers
    • H04B1/28—Circuits for superheterodyne receivers the receiver comprising at least one semiconductor device having three or more electrodes
    • 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
    • H04B1/403—Circuits using the same oscillator for generating both the transmitter frequency and the receiver local oscillator frequency
    • H04B1/406—Circuits using the same oscillator for generating both the transmitter frequency and the receiver local oscillator frequency with more than one transmission mode, e.g. analog and digital modes

Definitions

  • This invention relates to a transceiver and more particularly, but not exclusively, to a duplex or semi-duplex type transceiver.
  • the transceiver may be operable as an if transceiver or, when suitably adapted, it may be incorporated in an optoelectronic circuit.
  • the transceiver will be described with reference to an rf application on an rf board.
  • the if board is adapted for high data rate communication systems which may be used, for example, in applications such as video and computer links.
  • ISM industrial, scientific and medical
  • the present invention arose to overcome the aforementioned problems and provides an improved transceiver which does not suffer from any of the aforementioned problems.
  • a transceiver is operable to receive a signal and to transmit a signal at first and second frequency bands, the transceiver having a first switch in a transmission path, for switching a signal to be transmitted, at either of said frequency bands; and a receiving path, which in use, is adapted to be connected to an antenna; a second switch connected to said receiving path for switching a received signal, at either one of said frequency bands, characterised in that a transmit/receive switch is provided to switch selectively between receive and transmit modes for each frequency band.
  • the received signal and the transmitted signal are received and transmitted at the same frequency.
  • signals may be transmitted and received at different frequencies band.
  • This embodiment may be incorporated into repeater equipment; in which case a power amplifier may be provided for improving the signal-to-noise ratio (SNR); as energy is dissipated when the transceiver operates to transmit and receive in the same frequency band at the same time.
  • SNR signal-to-noise ratio
  • the first and second switches may be if switches.
  • the switches may be a beam splitter or prism or other suitably adapted optoelectronic switch.
  • Switching is by way of a micro-processor or software control from a personal computer.
  • Automatic detection means may be provided for detecting signals from one or more antennae and for determining whether the signals are of sufficient strength.
  • the automatic detection means may include the capability of dynamic channel hopping or switching so as to select a preferred channel and/or antenna.
  • a diversity switch may be incorporated into an automatic channel hopping function.
  • software may assist the automatic detection of a preferred channel.
  • the 2.4 GHz band is preferred currently as the 5.8 GHz band generally requires more expensive components and the attainable transmission range is less for a given antenna system.
  • the 5.8 GHz band has more channel capacity and is less prone to interference.
  • the invention permits migration from either band to the other thereby enhancing flexibility of a system. This particular combination reduces the number of components and therefore the cost because certain components can be incorporated into both frequency circuits.
  • a dual band (2.4/5.8 GHz) rf board meets this requirement at a much lower cost and size than, for example, providing 2 separate radios for the bands and clearly offers greater flexibility. This feature of the invention enables dissimilar networks or systems to communicate to one another.
  • a dual band transceiver has a further benefit in that an operator now has 230 MHz of available bandwidth, which can be useful if there are a number of users in the same vicinity.
  • a typical 802.11 standard wireless LAN radio occupies 22 MHz of spectrum, so it can be seen therefore that each band can only accommodate a small number of users in a given area.
  • transceiver 1 having a based band processor 10 for converting a signal to be transmitted into a spread spectrum.
  • Base band filter 12 and up converter converts a base signal, to 280 MHz using a voltage controlled oscillator (VCO).
  • VCO voltage controlled oscillator
  • SAW 14 acts as a bandpass filter.
  • Mixer 16 provides an output signal of 2.45 GHz.
  • Synthesizer 18 produces 3.4 GHz output signal for mixing with the 2.45 Ghz signal for subsequent transmission at a first frequency band. Transmission at a second frequency band, typically 2.4 GHz is achieved by switching switch 24b. Baseband and IF (intermediate frequency) sections are shared between both bands
  • HFA3624 IC acts as an up/downconvertor from 280 MHz IF frequency to 2.45 GHz which is used for the rf signal when in 2 4 GHz mode. In 5.8 GHz mode these sections are used as a second IF stage. The 2.4/5.8 switching occurs prior to the final mixer sections Implementation of switch 24 could be by using PLN diodes or an integrated
  • GaASFET switch both these methods may be software controlled.
  • the signal In 2.4 GHz mode the signal is routed to the power amplifier in transmit mode or the LNA (low noise amplifier) in receive mode. After those stages signals are combined at the transmit/receive switch 24a /24b and pass to (2.4 GHz) filter which is required to reject out-of -band signals from being transmitted or received.
  • the transmit/receive switch 24a /24b After those stages signals are combined at the transmit/receive switch 24a /24b and pass to (2.4 GHz) filter which is required to reject out-of -band signals from being transmitted or received.
  • the signal from the 2.4/5.8 GHz switch is applied to another mixer stage which converts the signal to 5.8 GHz.
  • the 5.8 GHz signals are routed to a power amplifier and LNA circuits in the same way as for 2.4 GHz.
  • An extra synthesiser is required to generate the 3 4 GHz LO (local oscillator) signal for the 5 8 GHz mixer stages
  • Amplifier 20 increases the rf power level and bandpass filter 21 which acts to provide a signal within a narrow licensed bandwidth for transmission to antenna 22
  • the invention may be used in a myriad of applications including, w ithout limitation signal generatoi or analyseis, telecommunication equipment, mobile telephones, video and wLAN based systems
  • the invention has been described by way of example only and variations may be made to the embodiment described without departing from the scope of the invention.

Landscapes

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

Abstract

Cet émetteur, qui est capable de fonctionner à des première et seconde bandes de fréquences, comprend un premier commutateur dans une voie de transmission pour commuter un signal à émettre sur l'une de ces bandes de fréquences; et une voie de réception qui, au moment de l'utilisation, est prévue pour être connectée à une antenne. Cet émetteur-récepteur se caractérise en ce que l'organe de réception du signal peut fonctionner dans l'une ou l'autre de ces bandes de fréquences, un second commutateur étant connecté à cette voie de réception pour commuter le signal ainsi reçu sur l'une ou l'autre de ces bandes de fréquences, pour que le signal reçu ainsi commuté se trouve dans la bande de fréquences souhaitée. Un avantage de cet émetteur-récepteur par rapport aux dispositifs existants consiste dans le fait que l'une des bandes de fréquences dans laquelle fonctionne l'émetteur-récepteur est la même que la fréquence intermédiaire de la seconde bande de fréquences utilisée par l'émetteur-récepteur. On peut ainsi obtenir un seul dispositif capable de couvrir un plus grand nombre de canaux de fréquences.
PCT/GB1999/003865 1998-11-19 1999-11-19 Emetteur-recepteur Ceased WO2000031886A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GBGB9825412.1A GB9825412D0 (en) 1998-11-19 1998-11-19 A transceiver
GB9825412.1 1998-11-19

Publications (1)

Publication Number Publication Date
WO2000031886A1 true WO2000031886A1 (fr) 2000-06-02

Family

ID=10842731

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB1999/003865 Ceased WO2000031886A1 (fr) 1998-11-19 1999-11-19 Emetteur-recepteur

Country Status (2)

Country Link
GB (2) GB9825412D0 (fr)
WO (1) WO2000031886A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105933942A (zh) * 2016-06-16 2016-09-07 北京小米移动软件有限公司 频段切换方法及装置

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5574775A (en) * 1993-08-04 1996-11-12 Lucent Technologies, Inc. Universal wireless radiotelephone system
EP0744831A2 (fr) * 1995-05-16 1996-11-27 Matsushita Electric Industrial Co., Ltd. Unité sans fil pour système à accès multiple et à division dans le temps
CA2209597A1 (fr) * 1996-07-03 1998-01-03 Northern Telecom Limited Emetteur-recepteur bimode
WO1998029973A1 (fr) * 1996-12-30 1998-07-09 Nokia Mobile Phones Limited Liaison infrarouge

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3100111B2 (ja) * 1995-06-26 2000-10-16 株式会社エヌ・ティ・ティ・ドコモ 移動無線機のマルチバンド高周波回路
GB2310342A (en) * 1996-02-16 1997-08-20 Northern Telecom Ltd Dual mode radio transceiver front end

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5574775A (en) * 1993-08-04 1996-11-12 Lucent Technologies, Inc. Universal wireless radiotelephone system
EP0744831A2 (fr) * 1995-05-16 1996-11-27 Matsushita Electric Industrial Co., Ltd. Unité sans fil pour système à accès multiple et à division dans le temps
CA2209597A1 (fr) * 1996-07-03 1998-01-03 Northern Telecom Limited Emetteur-recepteur bimode
US5881369A (en) * 1996-07-03 1999-03-09 Northern Telecom Limited Dual mode transceiver
WO1998029973A1 (fr) * 1996-12-30 1998-07-09 Nokia Mobile Phones Limited Liaison infrarouge

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105933942A (zh) * 2016-06-16 2016-09-07 北京小米移动软件有限公司 频段切换方法及装置

Also Published As

Publication number Publication date
GB9927503D0 (en) 2000-01-19
GB9825412D0 (en) 1999-01-13
GB2344724A (en) 2000-06-14

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