Multi-frequency communication system with an improved diversity

Details Multi-frequency communication system with an improved diversity Multi-frequency communication system with an improved diversity

1992-05-20

1994-11-29

Eisenzopf, Reinhard J.

Telecommunications

Transmitter and receiver at separate stations

Single message via plural carrier wave transmission

455101, 455135, 4552761, H04B 708

Patent

active

053698002

ABSTRACT:
In a transmitting section, a modulator modulates a first carrier with data o be transmitted, thereby producing a modulated output f.sub.m, a local oscillator generates a local oscillating signal to be used as a second carrier f.sub.LO, a mixer mixes the modulated output and the local oscillating signal, thereby generating waves of different frequencies. These waves include an upper side band wave f.sub.LO +f.sub.m and a lower side band wave f.sub.LO -f.sub.m. A transmitting antenna radiates electromagnetic waves into the air, which includes the waves of different frequencies generated by the mixer. In a receiving section, a receiving antenna receives the electromagnetic waves, a diversity section extracts at least one of the upper side band and lower side band waves f.sub.LO +f.sub.m, f.sub.LO -f.sub.m from the waves of different frequencies received by the receiving antenna, a local oscillator generates a local oscillating signal corresponding to the second carrier, a mixer mixes the one wave extracted by the diversity section and the local oscillating signal generated by the local oscillator, thereby generating an output, and a demodulator extracts a signal corresponding to the first carrier, from the output of the mixer, and demodulates the signal thus extracted, thereby outputting data corresponding to the data transmitted from the transmitting section.

REFERENCES:
patent: 1940097 (1933-12-01), Ohl et al.
patent: 2504341 (1950-04-01), Matthews
patent: 2955199 (1960-10-01), Mindes et al.
patent: 3662268 (1972-05-01), Gans et al.
patent: 4584716 (1986-04-01), Drentea
patent: 5204980 (1993-04-01), Sharples

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