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.
}
void FillSyncPatterns()
{
IQEncoder Enc = new IQEncoder(BITS_PER_SYMBOL, Constellation.Table_1_to_1, Constellation.ITable_8PSK, Constellation.QTable_8PSK, EncodingType.SCRAMBLE_ADD);
SyncScrambler scrambler = new SyncScrambler();
int SyncSymbolCounter = 0;
foreach (int BitChanSymb in SyncPreamble)
{
int[] sequence = ChanSymbToTribit[BitChanSymb];
scrambler.Init();
// repeat sequence 4 times
for (int i = 0; i < 4; i++)
{
foreach (int tribit in sequence)
{
Enc.Process(tribit, scrambler.DataNext(), SCRAMBLE_MASK, out PreamblePattern[SyncSymbolCounter]);
SyncSymbolCounter++;
}
}
}
IQ[] symb75 = new IQ[32];
foreach (int[] sequence in ChanSymbToTribit)
{
SyncSymbolCounter = 0;
scrambler.Init();
for (int i = 0; i < 4; i++)
{
foreach (int tribit in sequence)
{
Enc.Process(tribit, scrambler.DataNext(), SCRAMBLE_MASK, out symb75[SyncSymbolCounter]);
SyncSymbolCounter++;
}
}
SymbDetector.AddTarget(symb75);
}
}
