Concatenated code-decode system for the protection against inter

Details Concatenated code-decode system for the protection against inter Concatenated code-decode system for the protection against inter

1987-04-30

1989-01-24

Griffin, Robert L.

Pulse or digital communications

Repeaters

Testing

455 20, H03K 1100

Patent

active

048005703

ABSTRACT:
A digital signal to be transmitted (TXSG) is encoded through an external code device (EXCD); digital signal TXSG' so obtained (with a bit rate greater than TXSG) is used to modulate, through modulator MOD 1, a transmission carrier later amplified by transmitter TEQ 1 and radiated by antenna ANT1. The RF carrier sent by the transmitter is received by an intermediate transponder through antenna ANT2, receiver REQ2 and demodulator DEM1, which reconstitutes signal TXSG', save for transmission errors. The signal so received is once again encoded by internal coder INCD, obtaining a new digital signal TXSG", which has a bit rate even higher than TXSG'. This TXSG" signal is then used to modulate a second RF carrier by means of MOD2 modulator. The resulting signal is amplified by TEQ2 and radiated by antenna ANT3.
The RF signal sent by the transponder is received by the receiver terminal through ANT4 and, through receiver (REQ2) and demodulation (DEM2) units, a RXSG" signal is rebuilt, coinciding, save for transmission errors, with signal TXSG". Such signal is decoded by internal decoder INDC, thereby obtaining a signal RXSG' which, save for transmission errors, coincides with signal TXSG'.
This last signal is decoded by external decoder EXDC so as to rebuild signal RXSG which, save for transmission errors, coincides with transmitted signal TXSG.

REFERENCES:
patent: 3944723 (1976-03-01), Fong
patent: 4354054 (1982-10-01), Bellisio

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