Pulse or digital communications – Repeaters – Testing
Patent
1983-09-21
1987-02-24
Griffin, Robert L.
Pulse or digital communications
Repeaters
Testing
364728, 332 10, H04L 2700
Patent
active
046463232
ABSTRACT:
A system and method for digital transmission of pulses of a predetermined duration includes a transmitter (30) and a receiver (40). A data stream (a.sub.i) is transformed into a narrow band signal spectrum and following transmission is demodulated to a data stream (a.sub.i). In one form of the invention concept, a Delta function spectrum is converted into a quasi-rectangular transmitter spectrum by appropriate filters (26). In the receiver (40), a filter (28) is employed for data recovery. Data symbols which are received by the receiver (40) are decoupled by using periodic zeros of an autocorrelation function obtained at the receiver output filter. The shape factor of filters used in the overall system is selected to be preferably within the approximate range of 1.0-3.0. By selecting suitable slope responses of the aforementioned filters, the duration of the autocorrelation function and the resulting systems may be controlled for optimized results.
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Chin Stephen
Griffin Robert L.
Rosenberg Morton J.
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