Excavating
Patent
1983-04-19
1986-01-21
Fleming, Michael R.
Excavating
375 86, 375 52, G06F 1100
Patent
active
045661006
ABSTRACT:
A bit error rate of M-phase digital phase-modulated waves is measured by the steps comprising multiplying a received wave by M, phase-detecting the M-multiplied signal either directly or after frequency conversion, detecting errors by comparing the output level of the phase detection with a threshold, and counting the number of such errors. By employing above mentioned system, a bit error rate can be measured easily and accurately by a simple circuit structure.
REFERENCES:
patent: 4189622 (1980-02-01), Foslee
patent: 4291403 (1981-09-01), Waddill et al.
patent: 4305150 (1981-12-01), Richmond et al.
patent: 4355044 (1982-10-01), Uzunoglu
patent: 4367550 (1983-01-01), Douvcine
Takenaka, et al, "Bit Error Rate Monitor for Four Phase PSK System", Conference: ICC 1980, 8-12 Jun. 1980.
Goodins, "Performance Monitor Techniques for Digital Receivers Based on Extrapolation of Error Rate", IEEE Transaction, vol. Com. 16, No. 3, Jun. 1968.
Mizuno Toshio
Ohkawa Michihisa
Satoh Gunkichi
Fleming Michael R.
Kokusai Denshin Denwa Co. Ltd.
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