Flag (1) Address(14) Control(1/2) PID(1) Info(<256) FCS(2) Flag(1) MX909 Modem. MX909 Modem. Radio/ Antenna. Radio/ Antenna. Propagation loss & noise
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1 А А А А
2 Flag (1) Address(14) Control(1/2) PID(1) Info(<256) FCS(2) Flag(1) Satelitte Application data Radio link Ground Station Application data AX25 protocol MX99 Modem Radio/ Antenna Propagation loss & noise AX25 protocol MX99 Modem Radio/ Antenna АP АP АP
3 А А А А А А Noise Carrier Frame Head Bit Sync Frame Sync Control Bytes FEC 16 bit 16 bit 16 bit 8 bit Data 3 bytes Data Blocks Data 3 bytes Data 3 bytes
4
5 АP АP АP АP АP АP АP АP АP
6 9 km 3 km satellite
7 BER Bit Error Rate for GMSK SNR [db] АP АP АP Transmitter application Receiver application AX 25 transmit AX 25 receive AX 25 CRC: Detected errors MX99 transmit AWGN Channel MX99 receive AWGN CRC Detected errors Out1 Measure packages Display Demodulated Bit Error rate Display Output bit error Display Package error measuring FEC Corrected errors Transmitted packages Packages errors А А А
8 1 In General CRC Generator FEC Matrix Interleaver Scrambler GMSK 1 Out transmitted signal s(t) noise n(t) r(t) received signal 1 Out1 General CRC Syndrome Detector Detected error counter 3 Corrected Errors 2 Detected errors FEC decoder Matrix Deinterleaver Descrambler Descrambler1 GMSK GMSK Demodulator Baseband 1 In
9 АP АPАP АP АМ АМ АМ АМ АМ АМ АМ АМ
10
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