Pulse or digital communications – Repeaters – Testing
Patent
1983-06-06
1986-04-08
Bookbinder, Marc E.
Pulse or digital communications
Repeaters
Testing
375 18, 375 58, 375 87, 375103, H04B 1500, H03M 512, H04L 2700
Patent
active
045817502
ABSTRACT:
Transmission system for bi-phase modulated signals. Generally receiving filters for these signals will have a frequency response up to twice the bit frequency (twice 1/T) passband. For colored noise whose power increases as the frequency increases this may mean a considerable deterioration of the signal-to-noise ratio compared with the signal-to-noise ratio for unmodulated NRZ-signals. In order to increase the signal-to-noise ratio a receiving filter is used in this case, whose frequency response approximates zero above the bit frequency (1/T) (stopband) and which for lower frequencies is determined such that after filtering a predominantly three-level signal is obtained. The binary data signal can be drived from this signal by rectification and slicing. Use: Optical communication systems.
REFERENCES:
patent: 4142065 (1979-02-01), Tannhauser
patent: 4283789 (1981-08-01), Monrolin et al.
Lucky, R. W., et al., Principles of Data Communication, McGraw-Hill Book Co., New York, 1968.
Hauk, Waldemar et al., "The Calculation of Error Rates for Optical Fiber Systems", IEEE Trans. on Com., vol. COM-26, No. 7, Jul. 1978.
Bookbinder Marc E.
Briody Thomas A.
Eason Leroy
Greer Timothy K.
Streeter William J.
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