Pulse or digital communications – Repeaters – Testing
Patent
1989-12-14
1991-03-05
Buczinski, Stephen C.
Pulse or digital communications
Repeaters
Testing
375 56, 375 84, 329304, 364821, 455207, 455214, 455276, H04K 100
Patent
active
049982613
ABSTRACT:
In a digital data receiver (80) for demodulating a direct sequence spread spectrum differential phase shift keyed data signal, the signal is applied to the input transducer (140) of a SAW device (100) which has first and second output transducers (142, 144) spaced apart on the SAW substrate (130) so as to produce first and second output signals on output lines (102, 104), which are relatively delayed by a time corresponding to a symbol period. The output transducers are of identical construction and are matched to the spread spectrum code utilized in the data signal. Thus, a single SAW device (100) effects both correlation and delay. The output signals on the output lines (102, 104) are processed by a circuit including multipliers (106, 110) and a phase shifter (108) to produce output data signals representing the received data.
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K. V. Lever et al., "Surface Acoustic Wave Matched Filters for Communications Systems", The Radio and Electronic Engineer, May 1976, pp. 237-246.
Payne Freret et al., "Applications of Spread-Spectrum Radio to Wireless Terminal Communications", IEEE 1980 National Telecommunications Conference, Nov. 30-Dec. 4, 1980, pp. 69.7.1-69.7.4.
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Haartsen Jacobus C.
Tuch Bruce T.
van Driest Hans
Visee Maarten
Buczinski Stephen C.
Gregory Bernarr Earl
Hawk Jr. Wilbert
NCR Corporation
Sessler Jr. Albert L.
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