Pulse or digital communications – Repeaters – Testing
Patent
1984-10-17
1986-08-19
Cangialosi, Salvatore
Pulse or digital communications
Repeaters
Testing
375 10, 455 27, 178 2215, H04L 900
Patent
active
046073752
ABSTRACT:
The covert communication system comprises a first arrangement to translate binary "1" bits into different portions of a predetermined PN (pseudonoise) code sequence and primary "0" bits into a complement of the different portion of the PN sequences, the PN sequence being selected to spread the binary signal over as large a bandwidth as possible. A second arrangement is coupled to the first arrangement to transmit the portions of the PN sequence and the complements of the portions of the PN sequence at a variable transmission rate and at a power level below environmental noise of propagation medium. A third arrangement is coupled to the second arrangement through the propagation medium to receive the portions of the PN sequence and the complements of the portions of the PN sequence imbedded the environmental noise with a fourth arrangement coupled to the third arrangement to recover the binary signal from the received portions of the PN sequence and the received complements of the portions of the PN sequence. To render the communication system more covert, the second arrangement includes the Rayleigh fader producing a waveform simulating a Rayleigh fading characteristic with the waveform being modulated by the portions of the PN sequences and the complements of the portions of the PN sequences only during time periods the waveform is above a predetermined amplitude.
REFERENCES:
patent: 4231113 (1980-10-01), Blasbalg
patent: 4400790 (1983-08-01), Chambers et al.
patent: 4477912 (1984-10-01), Russell
Cangialosi Salvatore
ITT Corporation
Lewis Aaron J.
Meagher Thomas F.
O'Halloran John T.
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