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ofdm
Nov 16, 2004 8:25:56 GMT -5
Post by ajaydhingra on Nov 16, 2004 8:25:56 GMT -5
if anybody know,kindly explain the procedure to convert the discrete time domain signal (output of ifft) to continuous signal.
in my paper a pulse shape filter is used , kindly tell how the convolution is done.
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ofdm
Nov 16, 2004 14:05:43 GMT -5
Post by charan langton on Nov 16, 2004 14:05:43 GMT -5
The output of the IFFT is a continuous signal. This is beacuse each baseband signal (assume disrete) is being multiplied by a continuous carrier. The sum total of all such carriers for a OFDM signal is a continuous signal.
On the receive side, when we sample this received signal, we then convert it again to discrete for signal processing.
Charan Langton
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ofdm
Nov 16, 2004 23:30:35 GMT -5
Post by Ajay Dhingra on Nov 16, 2004 23:30:35 GMT -5
As we know, that ifft and fft are technique for digital data processing consequently in digital every thing is discrete output as well as input.
if output of the ifft is x(n), it exist for n=0,1 ..... N.
so it exist for only integer values of n.
how close the samples are it depends upon the value of quanta u choose.
but ultimately the result is discrete.
so the further processing needs to smoothing the signal or making it continuous.
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