Hi All, My problem is that above calculation sort of works, and isn't it exact. I have the following preable of 32 bits [1,0,1,0,1,1,0,0,1,1,0,1,1,1,0,1,1,0,1,0,0,1,1,0,0,1,1,1,0,1,0,1]. This can be seen in badpreamble.png, where for some reason I have trailing 0s or noise and the start of preamble is missing.
If I shift the position to 8 bits lag in the bit file and then plot(8shiftedpreamble.png), the corresponding IQ samples using above logic, it is almost right (alhough sitll not right. Any suggestions how to get the exact IQ samples ? Thanks, Abhinav On Sun, Jan 24, 2016 at 11:03 AM, abhinav narain <[email protected]> wrote: > Hi all, > This might be too simple, but I wanted to confirm as I am not sure how the > blocks manipulate the IQ samples and how AGC works, does it add more > samples for compensating the noise average or not. > > I have a flowgraph(image attached) which dumps the IQ samples and the bits > after using Polyphase Clock Sync. I want to find exact IQ samples > corresponding to > a specific preamble in the bitsequence I have obtained in the output > file. > Let say the starting position of sample is= P, the sample rate=S ksps, > samples \ > per symbol=Y. > > Is it correct to assume that the index of iq samples corresponding to > preamble in the IQ file will be at index P*Y ? > If preamble size is 32 bits then there will be 32*Y of them ? > > Thanks, > Abhinav > >
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