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Undersampling technique for the sampling of the ofdm signal

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shameem

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UNDER SAMPLING PROBLEM

Hi,
I am working on the front end design of ofdm decoder.I want to use undersampling technique for the sampling of the ofdm signal.Actually the RF signal comes in the L1 band.I tune it on 38.912 MHz IF.After that i want to under sample it at 8.192 MHz sampling frequency and do 2048 point fft.
My problem is how can i get the 2048 I & Q components of the signal to input to ifft function.
Please reply me as soon as possible.

Thank you
 

Renjith

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UNDER SAMPLING PROBLEM

hi,
mix ur input IF signal with the NCO of 8.192Mhz.
Here ur NCO should generate both sine and cosine signals so that u can mix both of these with the incoming IF to get the complex output (I and Q) for feeding to FFT block.
 

shameem

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Re: UNDER SAMPLING PROBLEM

Hi,
Thank you very much for ur valueable suggestion.
 

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