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OFDM with pilot and equalizer

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raymawri

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Hello,

I would like a matlab code for OFDM with pilot and different types of equalizers. I have a matlab code for OFDM without the equalization. I am having hard time incorporating the equalization into the OFDM.

Please advise
 

Equalization in OFDM with perfect subcarrier orthogonality is to done by multiply the received OFDM symbol by the inverse of a diagonal matrix that result from taking the FFT of the circular channel matrix. It's a one tap frequency domain equalizer. My guess is that your code performs it, but you don't realize it.
 

Hi David83,

Why for each subband of OFDM, we only need 1-tap equalizer ? only 1-tap ?
 

Conceptually, OFDM transforms a frequency selective channel into a number of frequency flat channels. In each subband k, the received signal can be written as

Yk=Hk*Xk+Wk

where Hk is the frequency response of the channel at frequency k, Xk is the transmitted symbol over frequency k, and Wk is the AWGN. So you need a one tap equalizer for each band, namely for subband k it's 1/Hk.
 
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