Pulse or digital communications – Spread spectrum – Direct sequence
Patent
1981-04-24
1983-04-12
Safourek, Benedict V.
Pulse or digital communications
Spread spectrum
Direct sequence
371 41, 455206, 455305, H04L 100
Patent
active
043800823
ABSTRACT:
The invention eliminates an FM interference from a digital signal when the interference occurs because the FM and digital signals are transmitted over adjacent routes and sharing a common frequency band. An error detector finds a difference between a detected baseband digital signal and an assumed transmission code, which is taken from the baseband signal. The detector produces a first error signal responsive thereto. A phase synchronizing circuit produces an output signal synchronized with the first error signal. A coefficient circuit multiplies the output of the synchronizing circuit by a complex coefficient which is then subtracted from the baseband signal. A second error detector produces a second error signal responsive to the difference between the output of the subtractor and a discriminated transmission code. Responsive thereto to a control circuit varies the complex coefficient to produce an output which is the original baseband signal, free of the FM interference.
REFERENCES:
patent: 3422222 (1969-01-01), Lord
patent: 3537008 (1970-10-01), Lakatos
patent: 3613077 (1971-10-01), Forney, Jr.
Nippon Electric Co. Ltd.
Safourek Benedict V.
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