Hi everyone, Got Stuck with fresh doubt. I saw a very old post in comp.dsp http://www.dsprelated.com/showmessage/58605/1.php ------------------------------------------------------------------------------------------------------- in that post, phil says "This isn't quite right. Keep in mind that frequencies that appear to be beyond the Nyquist frequency will end up wrapping (aliasing) around into the -ve frequencies. So... ........................N/2........................: 0 + (N/2-1)/(N*T) Hz ......................N/2+1......................: 0 - (N/2)/(N*T) Hz ... ........................N..........................: 0 - 1/(N*T) Hz Also, the OFDM symbol period will be N*T + M*T, where M represents the number of samples used for the cyclic prefix and suffix." -------------------------------------------------------------------------------------------------- i am wondering about this statement " Nyquist frequency will end up wrapping (aliasing) around into the -ve frequencies." At transmitters it is fine, but at receiver how it is being recovered (basically it doesn't satisfy sampling theorem)..i mean to say information is lost in terms of samples being missed (with inadequate sampling). Please explain, Thanks aizza ahmed
alias in OFDM
Started by ●October 31, 2011