Problem in Implementing Autocorrelation on Stratix II EP2S60 DSP Development Board

[Altera_Forum]

Hi there, 

 I am trying to synchronize the transmitted signal with the receiver by energy detection. The transmitted signal is a sine wave and I plan to autocorrelate it to obtain the peak and then transmitting the data. Could you please help me in implementing the autocorrelation using Stratix II.  Thanks a lot....  -S

[Altera_Forum]

--- Quote Start ---  I am working with frequencies of 3MHz(transmitted signal) and trying to make a model of visible light communication.  --- Quote End ---  That's a little vague.  What are you trying to do "in detail".  You have a DSP board, what are you sending to the DAC, what are you sending to the ADC? Do you have two boards that are supposed to communicate, or are you just looping things back on the same board? How are the TX and RX connected, eg. just a wire, or are you using the 'visible light communications' interface? What is that interface, and IR source? Are the source and destination using the same clock, or are they asynchronous?   What kind of direction have you been given for this project?  Cheers, Dave

[Altera_Forum]

I am having a hard time with my ADC. Its AC coupled and changes the signal I send. Could you please send me something about handling the ADC. 

 Thanks bro, Saket

[Altera_Forum]

--- Quote Start ---  I am having a hard time with my ADC. Its AC coupled and changes the signal I send. Could you please send me something about handling the ADC.   --- Quote End ---    If the ADC is AC coupled, then it will have a low-frequency limit. You need to check the bandwidth of the AC coupling circuit. Is it just some capacitors or is it a balun? Are you using an Altera board, or custom board?  There are some spectra in here from the Stratix II DSP Kit:  http://www.ovro.caltech.edu/~dwh/correlator/pdf/lfsr_tutorial.pdf  The spectrum looks fine at 3MHz (if this is the board you are using).  Cheers, Dave