OFDM Help

Hello,

I am trying to simulate a OFDM signal

I would to do the following before

Generate a signal and see its charachetrics with delay spread.

I have generated a signal and then divided it into parallel signal for
multipath, but now I have difficulty generating a delay spread.

I would appreciate if some one could help me in this regard.

Zigbee Jack

Once the transmit vector is created, one would want to pass it througH
the channel having the appropriate delay spread characterisitics.

Channel can be modelled as a complex FIR filter. The number of taps
of the 'flter' depends on the delay spread of the channel.

Regards,
Krishna

Generate the OFDM signal using IFFT. I'm not clear what " divided it
into parallel signal for multipath" means.

Anyways, once you have the signal , you can convolve the signal with
the channel FIR filter.

By having a look at the Power delay profile of the channel, generate
random taps for the FIR filter with the variance given in the power
delay profile.

Note that the sampling frequency of the channel is same as that of the
signal, only then convolution is valid. Else you will have to upsample
the signal or the channel and then convolve.

You can see the output of the channel to see the desired effects.