The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jan. 24, 1989
Filed:
Apr. 30, 1987
Giorgio Perrotta, Rome, IT;
Giacinto Losquadro, Rome, IT;
Selenia Spazio S.p.A., L'Aquila, IT;
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.