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This describes the signal flow through the gnuradio-0.9 ATSC Transmitter
and Receiver programs.
ATSC Transmitter
================
module input output notes
-------------------- ---------------- ------------------- --------
VrFileSource "MPEG transport stream" atsc_mpeg_packet
GrAtscRandomizer atsc_mpeg_packet atsc_mpeg_packet_no_sync whiten data with LFSR
GrAtscRSEncoder atsc_mpeg_packet_no_sync atsc_mpeg_packet_rs_encoded Reed-Soloman encoder
GrAtscInterleaver atsc_mpeg_packet_rs_encoded atsc_mpeg_packet_rs_encoded convolutional interleaver
GrAtscTrellisEncoder atsc_mpeg_packet_rs_encoded atsc_data_segment trellis encoder
GrAtscFieldSyncMux atsc_data_segment atsc_data_segment add in field syncs
GrAtscSymbolMapper atsc_data_segment float map [0,7] to +/- {1,3,5,7} and add pilot
GrWeaverModHead float float,float front half of Weaver VSB modulator
GrFIRfilterFFF (2x) float float low pass root raised cosine (matched filter)
GrWeaverModTail float,float short back half of Weaver VSB modulator
VrFileSink short "16-bit passband data"
ATSC Receiver
=============
module input output notes
-------------------- ---------------- ------------------- -------
VrFileSource "16-bit passband data" short
GrConvertSF short float convert short to float
GrFIRfilterFFF float float band pass root raised cosine centered at IF freq (matched filter)
GrAtscFPLL float float carrier tracking freq and phase lock loop with down converting mixer
GrFIRfilterFFF float float low pass to kill unwanted mixer image
GrRemoveDcFFF float float remove DC offset prior to symbol timing module
GrAtscBitTimingLoop3 float float,syminfo track symbol & segment timing and do fractional interpolation
GrAtscFieldSyncChecker float,syminfo float,syminfo look for field sync patterns
GrAtscEqualizer float,syminfo float,syminfo LMS equalizer
GrAtscFieldSyncDemux float,syminfo atsc_soft_data_segment remove field syncs and pack into data segments
GrAtscViterbiDecoder atsc_soft_data_segment atsc_mpeg_packet_rs_encoded Viterbi decoder (12 seg delay)
GrAtscDeinterleaver atsc_mpeg_packet_rs_encoded atsc_mpeg_packet_rs_encoded convolutional de-interleaver (52 seg delay)
GrAtscRSDecoder atsc_mpeg_packet_rs_encoded atsc_mpeg_packet_no_sync Reed-Solomon decoder
GrAtscDerandomizer atsc_mpeg_packet_no_sync atsc_mpeg_packet de-whiten with LFSR
VrFileSink atsc_mpeg_packet "MPEG transport stream"
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