uran.c

Practical DSP Applications in Communications Real-Time Digital Signal Processing Implementations,

/**************************************************************
*  URAN - This function generates pseudo-random numbers       *
**************************************************************/
static long n=(long)12357; // seed x(0) = 12357
float uran()

{
  float ran;               // random noise r(n)
  n=(long)2045*n+1L;       // x(n)=2045*x(n-1)+1
  n-=(n/1048576L)*1048576L;//x(n)=x(n)-INT[x(n)/1048576]*1048576
  ran=(float)(n+1L)/(float)1048577; //r(n)=FLOAT[x(n)+1]/1048577
  return(ran);             // return r(n) to main function
}