System for digital communications satellite with on board processing, adaptive attenuation conditions, traffic and radio interface for point to point communication and mesh networks.

摘要

Apparatus for processing and regenerating the signals of telecommunication satellites, for communications mesh multi-beam coverage between terminals standard user DVB-RCS and DVB-S2, the apparatus consists of the following parts: - A device bench filter (Fil); - A conversion device bench tail (ConvD); - A device bench analog digital conversion (DAC); - A bank channel demultiplexing device (DemC); - A switching device bench space and frequency (ComSF); - A signal processor controller (CPS); - A device bench demodulation and decoding (DemDec); - A device bench PID (RPID) recognition; - A device bench and modulation format (ModFor); - A circular signaling bus (BCS); - A device bench digital-analog conversion (CAD1); - A bank leading conversion device (Convs). characterized by: f. a number NC of radiofrequency channels (C1, C2, C3 ...) carrying the digital signals (SD1, SD2, SD3, ...) generated by the terrestrial terminals entering said filtering device bench (Fil) and once therein said channels are separated in band to be converted by said bank conversion devices tail (ConvD) to operate at the operating frequency of the device bench channel demultiplexing (DemC) receiving said C1, C2 channels, C3 , ... in digital format (CD1, CD2, CD3, ...) by the conversion carried out by the device bench analog-digital conversion (DAC); said channels are then processed by the bank channel demultiplexer device (DemC) that produces the desired number Nsc of sub-channels (SC1, SC2, SC3, ...), each containing the modulated and encoded symbols that represent the information contained in the intermediate frequency of said digital signals (SD1, SD2, SD3, ...); said desired number Nsc of said incoming (SCE1, SCE2, SCE3, ...) subchannels is determined by the bandwidth of said radiofrequency channels (C1, C2, C3, ...) and by the bandwidth of subchannels (SCE1, SCE2, SCE3, ...); g. said incoming sub-channels (SCE1, SCE2, SCE3, ...) are switched in space and frequency by the switching device bench space and frequency (ComSF), which processes the symbols belonging to said incoming sub-channels for generating as many output sub-channels (SCU1, SCU2, SCU3, ...) as output lines of said ComSF, thus originating a redistribution space and frequency of the digital signals (SD1, SD2, SD3, ...); h. said output sub-channels (SCU1, SCU2, SCU3, ...) are input to the bank of devices demodulation and turbo decoding (DemDec) that processes said sub-channels applying the current demodulation profile (PADM, for example 8PSK for) and the turbo decoding profile (PADT, for example FEC 3/4) and produces the digital flows in base (FDB1, FDB2, FDB3, ...) band; said PADM and PADT corresponding to the set of demodulation profiles (PDM1, PDM2, PDM3 ...) and turbo decoding profiles (PTD1, PTD2, PTD3, ....) respectively obtained by said DemDec; demodulation profiles (PDM1, PDM2, PDM3 ...) and said turbo decoding profiles (PTD1, PTD2, PTD3, ...) comply with the schemes specified by the standard DVB-RCS and form a suitable subset thereof ; said PADM and PADT are defined on the basis of the strength objectives to the attenuations on the leading channel and efficient use of the transmission band by said digital signals (SD1, SD2, SD3, ...); said PADM and PADT are actuated by said DemDec after a command sent by the signal processing controller (CPS); i. said digital flows in base (FDB1, FDB2, FDB3, ...) band are input to the bank of formatters devices and modulation (ModFor); said ModFor generates regenerated digital flows (FDR1, FDR2, FDR3, ...) applying the current modulation profile (PAM, for example 8-PSK) and the current turbo encoding profile (PAC, for example LDPC with FEC 3/4 ); said PAM and PAC corresponding to the set of modulation profiles (PM1, PM2, PM3 ...) and encoding profiles assembly (PC1, PC2, PC3, ...) respectively carried out by said ModFor; said modulation profiles (PM1, PM2, PM3 ...) and encoding profiles (PC1, PC2, PC3, ...) comply with the schemes specified by the standard DVB-RCS and form a suitable subset thereof; said PAM and PAC are defined on the basis of the strength objectives, the attenuations on the trailing channel and efficient use of the transmission band by said digital signals (SD1, SD2, SD3, ...); said PAM and PAC are actuated by said ModFor after a command sent by said CPS; the number of generated digital streams (FDR1, FDR2, FDR3, ...) is equal to the NC number of radio frequency channels (C1, C2, C3, ...); j. said regenerated digital flows (FDR1, FDR2, FDR3, ...) cross the digital device bench-analog conversion (CDA1) and the bank leading conversion device (Convs) to then be supplied to the subsequent sections amplification on board the satellite before being transmitted on the radio channel queue.