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1. WO1996005661 - MICROWAVE RADIO SYSTEM

Publication Number WO/1996/005661
Publication Date 22.02.1996
International Application No. PCT/GB1995/001959
International Filing Date 17.08.1995
Chapter 2 Demand Filed 07.03.1996
IPC
H03D 7/16 2006.01
HELECTRICITY
03BASIC ELECTRONIC CIRCUITRY
DDEMODULATION OR TRANSFERENCE OF MODULATION FROM ONE CARRIER TO ANOTHER
7Transference of modulation from one carrier to another, e.g. frequency-changing
16Multiple frequency-changing
H04B 1/50 2006.01
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
BTRANSMISSION
1Details of transmission systems, not covered by a single one of groups H04B3/-H04B13/123; Details of transmission systems not characterised by the medium used for transmission
38Transceivers, 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
40Circuits
50using different frequencies for the two directions of communication
CPC
H03D 7/163
HELECTRICITY
03BASIC ELECTRONIC CIRCUITRY
DDEMODULATION OR TRANSFERENCE OF MODULATION FROM ONE CARRIER TO ANOTHER
7Transference of modulation from one carrier to another, e.g. frequency-changing
16Multiple-frequency-changing
161all the frequency changers being connected in cascade
163the local oscillations of at least two of the frequency changers being derived from a single oscillator
H04B 1/50
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
BTRANSMISSION
1Details 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
38Transceivers, 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
40Circuits
50using different frequencies for the two directions of communication
Applicants
  • NERA LIMITED [GB]/[GB] (AllExceptUS)
  • COWAN, David, Alexander [GB]/[GB] (UsOnly)
  • PATEL, Bharat [GB]/[GB] (UsOnly)
Inventors
  • COWAN, David, Alexander
  • PATEL, Bharat
Agents
  • GIBSON, Stewart, H.
Priority Data
9416637.817.08.1994GB
Publication Language English (EN)
Filing Language English (EN)
Designated States
Title
(EN) MICROWAVE RADIO SYSTEM
(FR) FAISCEAU HERTZIEN
Abstract
(EN)
A transmitter/receiver circuit for one station of a microwave radio system comprising one signal path (10) for upconverting a signal for transmission from an antenna and a second signal path (20) for downconverting a signal received on the antenna. A single local oscillator (12) runs at twice the duplex frequency and is used to provide the signals for the upconversion and the downconversion: the oscillator signal is used directly for upconversion, and is divided by two for downconversion. A local oscillator synthesiser (17) effects the final upconversion stage of the transmitted signal and the initial downconversion stage of the received signal. Thus, the arrangement is of simple construction and requires fewer local oscillators than prior art devices. Also, the local oscillator synthesisers for two communicating radio stations can be of exactly the same, relatively simple design.
(FR)
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.
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