int SendSyncPreamble()
{
int NumSent = 0;
int[] DCBits = new int[6];
DCBits[0] = D1;
DCBits[1] = D2;
DCBits[5] = 0;
PreambleScrambler.Init();
for (SyncSymbolCounter = PreambleSize - 1; SyncSymbolCounter >= 0; SyncSymbolCounter--)
{
NumSent += SendSyncString(SyncPreamble);
// This is how the counter is formed - bits 5:4, 3:2 and 1:0 are mapped into tribits
DCBits[2] = ((SyncSymbolCounter >> 4) & 0x3) | 0x4;
DCBits[3] = ((SyncSymbolCounter >> 2) & 0x3) | 0x4;
DCBits[4] = ((SyncSymbolCounter >> 0) & 0x3) | 0x4;
NumSent += SendSyncString(DCBits);
}
return(NumSent);
}
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);
}
}
