Radio communication system
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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Abstract
A radio communication system includes a transmitter unit, a transmission line and a receiver unit. The transmitter unit produces a vertically-polarized wave carrier or a horizontally-polarized wave carrier or both, in accordance with transmission data to be transmitted to the receiver unit. The receiver unit discriminates the levels of the thus transmitted vertically- and horizontally-polarized wave carriers to reproduce the original data.
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Citations
25 Claims
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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:
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A radio communication system for transmitting and receiving digital data over a transmission path, using a multilevel keying type amplitude shift keying modulation method, said system comprising:
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a transmitter unit operatively coupled to the transmission path, for generating a carrier, transforming the carrier to V- and H-polarized wave carriers at any one of predetermined multilevel amplitudes in dependence upon the digital data, the sum of the amplitudes of the V- and H-polarized wave carriers being substantially constant during data transmission, and transmitting at least one of the V- and H-polarized wave carriers over the transmission path as a trasmission signal 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 according to a variety of combinations of the multilevel amplitudes 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. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25)
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Specification