Radio communication system

Details Radio communication system Radio communication system

1985-01-22

1987-05-12

Safourek, Benedict V.

Pulse or digital communications

Repeaters

Testing

375 39, 371 55, 455 60, H04L 2534, H04B 700

Patent

active

046655328

ABSTRACT:
A radio communication system using a QAM system. In the transmission system, the data of each channel to be transmitted is divided into data groups having frame slots. When the polarity of the mean value of a data summed in a present data group is the same as the polarity of the mean value of the deviation of all data group coming before, all data in the present data group is inverted, a direct current component and a lower frequency component near the direct current component are suppressed, and carrier waves are injected after encoding. In the receiving system, a decoder decodes a received signal to obtain the original data before the encoding by the transmission system.

REFERENCES:
patent: 2957947 (1960-10-01), Bowers
patent: 3311442 (1967-03-01), De Jager et al.
patent: 3343093 (1967-09-01), Van Gerwen
patent: 3344352 (1967-09-01), Daguet
patent: 3349177 (1967-10-01), Cattermole
patent: 3378771 (1968-04-01), Van Gerwen et al.
patent: 3955141 (1976-05-01), Lyon et al.
patent: 4408189 (1983-10-01), Betts et al.
patent: 4519073 (1985-05-01), Bertocci et al.
patent: 4528550 (1985-07-01), Graves et al.

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