System for transmitting data through a troposcatter medium

Details System for transmitting data through a troposcatter medium System for transmitting data through a troposcatter medium

1984-05-15

1986-07-15

Safourek, Benedict V.

Pulse or digital communications

Repeaters

Testing

375 40, 375 96, 375100, 375102, 329135, 332 17, 332 23R, H04L 2726

Patent

active

046010467

ABSTRACT:
A method of transmitting binary data from one station to another via a troposcatter medium, characterized in that the data is converted to parallel form so that the bits produce distinctive pairs of sine and cosine harmonics having different frequencies, which harmonics are summed in two separated channels that are modulated by rf sine and cosine modulating signals that are combined and transmitted to the receiver, together with a test signal that was periodically inserted in the parallel bits. The receiver supplies the signals to banks of matched filters that produce a first set of signal estimates from which the test signal is detected. A matrix system responsive to the test signal produces from the first set of estimates a second set of signal estimates having lower distortion than the first set. When the system is provided with diversity signal transmission at a different rf frequency, the test signal at the receiver is used to provide weighted diversity channel signals that are summed to provide third signal estimates having less distortion than the second set of estimates.

REFERENCES:
patent: 3955141 (1976-05-01), Lyon et al.
patent: 3993956 (1976-11-01), Gilmore et al.
patent: 4528674 (1985-07-01), Sweeney et al.

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