System for transmitting data through a troposcatter medium
First Claim
1. Apparatus for transmitting and receiving binary data signals in serial form from one station to another through a troposcatter medium, comprising(a) means for converting the serial data signals to parallel data signals;
- (b) means for periodically inserting a channel test signal into said parallel data signals;
(c) means for generating sine and cosine harmonics for first and second groups of said parallel data signals, respectively, half of each of said sine and cosine harmonics generators being contained in one channel (I) and the remaining sine and cosine harmonics generators being contained in another channel (Q), each pair of sine and cosine harmonics generators in a given channel having a different harmonic frequency (w1 -w16), respectively, corresponding pairs of sine and cosine harmonics generators in the other channel having corresponding harmonic frequencies, respectively;
(d) means for adding the sine and cosine harmonics for each channel, thereby to define respective channel signals (SI, SQ);
(e) means for modulating said channel signals with radio frequency cosine and sine modulating signals, respectively, and for adding the cosine and sine modulated signals, thereby to produce resultant rf signals;
(f) means for transmitting said resultant rf signals; and
(g) means for receiving said transmitted signal and for reproducing therefrom the original binary data signals.
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Accused Products
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.
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Citations
12 Claims
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1. Apparatus for transmitting and receiving binary data signals in serial form from one station to another through a troposcatter medium, comprising
(a) means for converting the serial data signals to parallel data signals; -
(b) means for periodically inserting a channel test signal into said parallel data signals; (c) means for generating sine and cosine harmonics for first and second groups of said parallel data signals, respectively, half of each of said sine and cosine harmonics generators being contained in one channel (I) and the remaining sine and cosine harmonics generators being contained in another channel (Q), each pair of sine and cosine harmonics generators in a given channel having a different harmonic frequency (w1 -w16), respectively, corresponding pairs of sine and cosine harmonics generators in the other channel having corresponding harmonic frequencies, respectively; (d) means for adding the sine and cosine harmonics for each channel, thereby to define respective channel signals (SI, SQ); (e) means for modulating said channel signals with radio frequency cosine and sine modulating signals, respectively, and for adding the cosine and sine modulated signals, thereby to produce resultant rf signals; (f) means for transmitting said resultant rf signals; and (g) means for receiving said transmitted signal and for reproducing therefrom the original binary data signals. - View Dependent Claims (2, 3, 4, 5, 6)
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7. The method for transmitting and receiving binary data signals in serial form from one station to another through a troposcatter medium, comprising the steps of
(a) converting the serial data signals to parallel data signals; -
(b) periodically inserting a channel test signal into said parallel data signals; (c) generating sine and cosine harmonics for first and second groups of said parallel data signals, respectively, half of each of said sine and cosine harmonics generators being contained in one channel (I) and the remaining sine and cosine harmonics generators being contained in another channel (Q), each pair of sine and cosine harmonics generators in a given channel having a different harmonic frequency (w1 -w16), respectively, corresponding pairs of sine and cosine harmonics generators in the other channel having corresponding harmonic frequencies, respectively; (d) adding the sine and cosine harmonics for each channel, thereby to define respective channel signals (SI, SQ); (e) modulating said channel signals with radio frequency cosine and sine modulating signals, respectively, and for adding the cosine and sine modulated signals, thereby to produce resultant signals; (f) transmitting said resultant rf signals; and (g) receiving said transmitted signal and reproducing therefrom the original binary data signals. - View Dependent Claims (8, 9, 10, 11, 12)
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Specification