/* FFT function:
* Real[] is the real part of complex input/output data;
* Imag[] is the imaginary part of complex input/output data;
* FFTSize is the data length equal to 2^M;
* Sign represents the FFT() function: 1 -> FFT
* -1 -> IFFT;
* Results are stored back in Real[] and Imag[];
*/
void FFT(int Real[], int Imag[], WordType sign);
/* CONVBASE Converts the number base of the input data (DataIn):
* ConvBase(DType DataIn[], DType DataOut[], DType DataLen, DType sign)
* From the current base (CurrBase) to the new base required (NewBase);
* If the new base is less than the old base, e.g
* NewBase = 2 and CurrBase = 8, the DataOut will have more
* data words. For the above example DataOut will be 4 times
* longer than DataIn;
* The actual base used = 2^NewBase, thus NewBase = 8, is base 256;
* E.g. DataIn = [ 2 64 20 ] with CurrBase = 8, NewBase = 2
* DataOut = [2 0 0 0, 0 0 0 1, 0 1 1 0]
* Note : Both the input and output data is in a serial format;
* DataLen is the length of DataIn[];
* Sign represents the ConvBase() function: 1 -> NewBase < CurrBase
* 0 -> NewBase > CurrBase;
* Other -> No change;
*/
void ConvBase(DType DataIn[], DType DataOut[], WordType DataLen, WordType Sign);
/* Convert 2-bit binary code to Gray code */
void Gray2(DType DataIn[], WordType Length);
/* Change the source data format to fit the channel encoder */
void SrcToChan(short SrcData[], DType ReqData[], WordType SymbolMark[], WordType BitMark[]);
/* Change the data format to fit the source decoder */
void ChanToSrc(DType ChannelData[], short SrcData[], WordType PosMark[]);
/* Round the data to nearest integer */
WordType Round(float RealData);
/* Generates a pseudorandom number:
* *Seed is the seed of this function;
* RandMax is the maximum number of pseudorandom;
*/
unsigned short Random(unsigned int *Seed, unsigned short RandMax);
