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Radio transmission system

  • US 5,903,592 A
  • Filed: 09/30/1996
  • Issued: 05/11/1999
  • Est. Priority Date: 04/18/1996
  • Status: Expired due to Term
First Claim
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1. A radio transmission system having a master station and a plurality of series connected substations connected to the master station via a radio channel, comprising:

  • first receiving means, provided in each of the substations, for receiving a plurality of modulated waves modulated by means of spread spectrum and sent in a first transmission direction;

    demodulating means, provided in each of the substations, for demodulating a modulated wave destined therefor by means of spread spectrum from among said plurality of modulated waves received by said first receiving means;

    first transmitting means, provided in each of the substations, for transmitting said plurality of modulated waves received by said first receiving means in the first transmission direction to an adjacent one of the substations,second receiving means, provided in each of the substations, for receiving a plurality of modulated waves modulated by means of spread spectrum and sent in a second transmission direction exactly opposite to the first transmission direction;

    modulating means, provided in each of the substations, for modulating a baseband signal to be sent therefrom by means of spread spectrum; and

    second transmitting means, provided in each of the substations, for transmitting, together with said plurality of modulated waves received by said second receiving means, a modulated wave obtained by said modulating means in the second transmission direction to an adjacent one of the substations or the master station.

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