Short wave transmission method and apparatus therefor

Details Short wave transmission method and apparatus therefor Short wave transmission method and apparatus therefor

1996-05-15

1998-11-24

Cuchlinski, Jr., William A.

Telecommunications

Transmitter and receiver at separate stations

Plural transmitters or receivers

343796, 343822, 342363, H04B 7005, H04B 701, H04B 7015, H04B 1500

Patent

active

058421351

ABSTRACT:
In a short wave transmission method, a carrier in a short wave band is circularly polarized and radiated from an antenna, thereby removing an influence of fading. A short wave transmission apparatus has a transmission apparatus including a carrier generation unit, a subcarrier generation unit, a first mixer, a phase shifter, a second mixer, and two orthogonal dipole antennas. The carrier generation unit generates a carrier in a short wave band. The subcarrier generation unit generates a subcarrier. The first mixer receives the carrier and the subcarrier. The phase shifter phase-shifts the subcarrier generated from the subcarrier generation unit by .pi./2. The second mixer receives the carrier and a subcarrier which is phase-shifted by .pi./2 by the phase shifter.

REFERENCES:
patent: 4242661 (1980-12-01), Henoch et al.
patent: 4494117 (1985-01-01), Coleman
patent: 4742354 (1988-05-01), Wen et al.
patent: 5483680 (1996-01-01), Talbot

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