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Radio communication system

  • US 4,658,405 A
  • Filed: 01/10/1984
  • Issued: 04/14/1987
  • Est. Priority Date: 01/21/1983
  • Status: Expired due to Term
First Claim
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1. A radio communication system for transmitting and receiving digital data over a transmission path using an on-off amplitude shift keying modulation method, said system comprising:

  • a transmitter unit, operatively coupled to the transmission path, for generating a carrier, transforming the carrier into a vertically (V)-polarized wave carrier and a horizontally (H)-polarized wave carrier in dependence upon the digital data and transmitting at least one of the V-polarized wave carrier and the H-polarized wave carrier as a transmission signal, over the transmission path when the digital data is to be transmitted; and

    a receiver unit, operatively coupled to the transmission path to receive the transmission signal for separating the transmission signal of the V-polarized wave carrier and the H-polarized wave carrier into V- and H-polarized wave received signals, detecting the amplitude levels of the V- and H-polarized received signals and reproducing the digital data as received data in dependence upon existence or nonexistence of the V- and H-polarized wave received signals, comprising;

    a V-polarized wave mixer, operatively coupled to the transmission path, for demodulating the V-polarized wave received signal;

    a V-polarized wave intermediate frequency amplifier operatively connected to said V-polarized wave mixer;

    a V-polarized wave detector, operatively connected to said V-polarized wave intermediate frequency amplifier, for detecting the V-polarized wave received signal;

    an H-polarized wave mixer, operatively coupled to the transmission path, for demodulating the H-polarized wave received signal;

    an H-polarized wave intermediate frequency amplifier operatively connected to said H-polarized wave mixer;

    an H-polarized wave detector, operatively connected to said H-polarized wave intermediate frequency amplifier, for detecting the H-polarized wave received signal;

    a local oscillator, operatively connected to said V- and H-polarized wave mixers, supplying a local oscillation signal commonly to both said V- and H-polarized wave mixers to produce individual intermediate frequency signals;

    a differential amplifier, operatively connected to said V- and H-polarized wave detectors, for amplifying a difference between the V- and H-polarized wave received signals; and

    a discriminator, operatively connected to said differential amplifier, for reproducing the digital data.

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