void InitReceiveData()
{
if (CurrentMode.Mode == MILSTD_188.Mode.D_4800N)
{
this.Interleaver = new Interleaver_188_110A_4800();
}
else
{
this.Interleaver = new Interleaver_188_110A(CurrentMode.InterleaverColumns, CurrentMode.InterleaverRows);
}
this.TotalPatternsInBlock = CurrentMode.BlockLength / (CurrentMode.ProbeDataSymbols + CurrentMode.UnknownDataSymbols);
this.ProbeCounter = 0;
this.ProbeTarget = new IQ[CurrentMode.ProbeDataSymbols];
this.Probe = new int[CurrentMode.ProbeDataSymbols];
this.DataBlock = new int[CurrentMode.UnknownDataSymbols];
this.FECBuffer = new byte[Interleaver.Length];
this.OutputData.Clear();
this.DataScrambler = new LFSR_188_110A();
if (CurrentMode.Mode == MILSTD_188.Mode.D_4800N)
{
this.FECDecoder = null;
}
else
{
this.FECDecoder = new VitDecoder(ConvEncoderType.Truncate, FECEncoderRate * CurrentMode.RepeatDataBits, FECEncoderConstraint, FECEncoderPoly, -1, 8, 0);
}
this.ProbeCorr = new Correlator(CORR_TYPE.NONE, CurrentMode.ProbeDataSymbols, CurrentMode.ProbeDataSymbols, 0, 0, 0, 0);
this.Decoder = new IQDecoder(CurrentMode.BitsPerSymbol, CurrentMode.BitsToSymbolTable, Constellation.IQTable_8PSK, EncodingType.SCRAMBLE_ADD);
this.Decoder.StartCorrectionProcess(CurrentMode.UnknownDataSymbols + CurrentMode.ProbeDataSymbols);
}
public TxModem(MILSTD_188.Mode modemMode, float processingFreq, float outputFreq, float[] symbolFilter, float[] outputFilter)
{
this.ModemMode = modemMode;
// Set up all the required parameters
MILSTD188_110B.modemModes[ModemMode].GetModeInfo(out ModemMode, out D1, out D2, out PreambleSize, out InterleaverRows,
out InterleaverColumns, out UnknownDataSymbols, out ProbeDataSymbols, out BlockLength,
out RepeatDataBits, out BitsPerSymbol, out MGDTable);
if (modemMode == MILSTD_188.Mode.D_4800N)
{
this.DataInterleaver = new Interleaver_188_110A_4800();
}
else
{
this.DataInterleaver = new Interleaver_188_110A(InterleaverColumns, InterleaverRows);
}
this.DataInterleaver.Init();
this.DataScrambler = new LFSR_188_110A();
this.PreambleScrambler = new SyncScrambler();
if (modemMode == MILSTD_188.Mode.D_4800N)
{
this.FECEncoder = null;
}
else
{
this.FECEncoder = new ConvEncoder(ConvEncoderType.Truncate, FECEncoderRate * RepeatDataBits, FECEncoderConstraint, FECEncoderPoly, -1, 8);
}
this.Encoder = new IQEncoder(BITS_PER_SYMBOL, Constellation.Table_1_to_1, Constellation.IQTable_8PSK, EncodingType.SCRAMBLE_ADD);
this.Modulator = new IQModulator(CARRIER_FREQ, CARRIER_FREQ, NUM_FREQ, processingFreq, SYMBOLRATE, symbolFilter);
this.OutputBuff = new float[(int)(processingFreq / SYMBOLRATE)];
this.OutputFilter = new FIR(outputFilter, (int)(processingFreq / outputFreq));
this.FlushModulatorLength = 0;
if (symbolFilter != null)
{
FlushModulatorLength += (symbolFilter.Length * 2);
}
if (outputFilter != null)
{
FlushModulatorLength += (outputFilter.Length * 2);
}
this.TotalPatternsInBlock = BlockLength / (ProbeDataSymbols + UnknownDataSymbols);
// FEC Size and Counter - reinitialize FEC on interleaver boundaries
FECBuffer = new byte[this.DataInterleaver.Length];
FECLength = this.DataInterleaver.Length / (FECEncoderRate * RepeatDataBits);
FECCounter = 0; // Re-initialize FEC coder on interleaver boundaries.
}
public TxModem(MILSTD_188.Mode modemMode, float processingFreq, float outputFreq, float[] symbolFilter, float[] outputFilter)
{
this.ModemMode = modemMode;
// Set up all the required parameters
MILSTD188_110B_39.modemModes[ModemMode].GetModeInfo(out ModemMode, out D1, out D2, out PreambleSize, out InterleavingDegree,
out InterleaverNumBlocks, out BitsPerCodeword, out SyncSymbols, out BlockLength,
out RepeatDataBits, out BitsPerSymbol, out BitsToSymbols);
this.DataRate = Baudrates[D2];
this.DiversityArray = Diversity_New[D2];
this.InputBlockSize = (int)(processingFreq / SYMBOLRATE);
// For 2400 baud we use RS(14, 10), for all others - RS(7,3)
int SymbTotal = (DataRate == 2400) ? 14 : 7;
int SymbData = (DataRate == 2400) ? 10 : 3;
DataSymbols = BitsPerCodeword * InterleavingDegree * InterleaverNumBlocks;
// DataSymbols = TotalBits * RS_BITS * InterleavingDegree * InterleaverNumBlocks; // The same
// Here is the magic formula that keeps the incoming and outgoing bitrate:
// @ 2400 K = (16 * Int * NumBlocks ) / 9
// @ any other K = (4 * Int * NumBlocks ) / 9
SyncSymbols = (((DataRate == 2400) ? 16 : 4) * InterleavingDegree * InterleaverNumBlocks) / 9;
SyncLFSR = new LFSR__188_110B_39(9, 0x0116);
// Calculate the seed value - the scrambler repeats every 2^9 - 1 = 511 symbols
// Start with the desired end value and count the (511 - necessary number of symbols)
int NumShift = 0x1FF - SyncSymbols; if (NumShift < 0)
{
NumShift += 0x1FF;
}
SyncLFSR.Init(0x1FF);
SyncLFSR.Shift(NumShift + 1);
LSFRSeed = SyncLFSR.Value & 0x1FF;
this.DataInterleaver = new Interleaver_188_110B_39(InterleavingDegree, InterleaverNumBlocks, RS_BITS, SymbTotal, SymbData);
this.DataInterleaver.Init();
this.DiversitySpreader = new DataSpreader <byte>(BitsPerSymbol, this.DiversityArray);
this.DiversitySpreader.Init();
this.Encoder = new IQEncoder[NUM_FREQ];
for (int i = 0; i < NUM_FREQ; i++)
{
Encoder[i] = new IQEncoder(BITS_PER_SYMBOL, Constellation.BitsToPhase_39, Constellation.IQTable_QPSK45,
EncodingType.DIFF_IQ);
}
this.Modulator = new OFDMFFTModulator(CARRIER_FREQ_LO, CARRIER_FREQ_HI, NUM_FREQ, processingFreq, SYMBOLRATE);
this.PreambleModulator = new IQModulator(CARRIER_FREQ_LO, CARRIER_FREQ_HI, NUM_FREQ, processingFreq, SYMBOLRATE, null);
this.DopplerTone = new Generator();
this.DopplerTone.Init(DOPPLER_FREQ + FREQ_OFFSET, processingFreq, 0);
this.OutputFilter = new FIR(outputFilter, (int)(processingFreq / outputFreq));
this.FlushModulatorLength = 20;
if (symbolFilter != null)
{
FlushModulatorLength += (symbolFilter.Length * 2);
}
if (outputFilter != null)
{
FlushModulatorLength += (outputFilter.Length * 2);
}
}
