Pulse or digital communications – Repeaters – Testing
Patent
1986-09-03
1988-06-21
Cangialosi, Salvatore
Pulse or digital communications
Repeaters
Testing
380 6, 380 34, H04K 100, H04L 900
Patent
active
047529393
ABSTRACT:
A method is provided for achieving initial synchronization of the transmission and reception of a frequency hopped communication signal, which comprises the steps of transmitting a preamble defined by a sequence of synchronizing pulses on a single channel and transmitting random dummy pulses over the remaining channels to hide the preamble. The received signal is filtered to obtain the preamble which is then convolved with a stored replica of the preamble to produce a synchronizing signal that is used to synchronize frequency hopping of the receiver and transmitter in preparation for the transmission of information. The received, constituent pulses of the preamble are delayed and accumulated by a baseband correlator (18) to form a composite pulse whose magnitude is detected by a threshold detector (20). The threshold detector produces the synchronizing signal (22) when the accumulated pulse reaches a prescribed value indicating that all of the bits of the preamble have been received.
REFERENCES:
patent: 4188580 (1980-02-01), Nicolai et al.
patent: 4267592 (1981-05-01), Craiglow
patent: 4388723 (1983-06-01), Keen
patent: 4561089 (1985-12-01), Rouse et al.
patent: 4601047 (1986-07-01), Horwitz et al.
patent: 4621365 (1986-11-01), Chiu
International Search Report.
National Telecommunications Conference, 27-29 Nov. 1979; IEEE, vol. 3, S. S. Rappaport et al., "A Two Level Coarse Code Acquisition Scheme for Spread Spectrum Radio".
Amoroso Frank
Taylor Norman L.
Cangialosi Salvatore
Hughes Aircraft Company
Karambelas A. W.
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