Excavating
Patent
1978-04-28
1980-04-29
Griffin, Robert L.
Excavating
371 68, 371 69, H04J 314
Patent
active
042008387
ABSTRACT:
Apparatus for evaluating the error rate of a binary digital signal transmitted according to a multiple level modulation process in which a received signal is connected to a main and an auxiliary demodulator in parallel, the auxiliary modulator including means to disturb the signal, the output from the main demodulator being applied to a comparator to provide a first signal according to the comparison of a first signal pattern with a second signal pattern and the auxiliary demodulator including a comparator whose output provides a second signal according to the state of modulation of first and second received signals, the first and second signals being applied to a modulo 2 adder whose output is applied to a counter.
REFERENCES:
patent: 4064459 (1977-12-01), Markwitz
patent: 4091240 (1978-05-01), Lainey
A Bit Error Rate Monitor for Digital PSK Links, Leon et al., IEEE Transactions on Communications, vol. COM-23, #5, May, 1975.
Performance Monitor Techniques for Digital Receivers Based on Extrapolation of Error Rate, Gooding, IEEE Transactions on Communications, vol. COM-16, #3, Jun. 1968.
Griffin Robert L.
Masinick Michael A.
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