OFDM- Assuming the channel response remains constant and G2L, the demodulated signal is given by Y(n)=A(n)X(n)+z(n),where A(n) is diagonal, or, equivalently, as Y(n,k)=a(n,)X(n,k)+Z(mn,k),0≤k≤K Besides the noise component, the demodulated symbol Y(n, k)is just the product of the complex gain and the corresponding data symbol X(n,k) OF DM with a cyclic prefix transforms a frequency selective fading channel into K decoupled and perfectly flat fading subchannels Georgia Institute of Technology Center for Signal and Image ProcessingGeorgia Institute of Technology Center for Signal and Image Processing OFDM - III • Assuming the channel response remains constant and G  L, the demodulated signal is given by or, equivalently, as • Besides the noise component, the demodulated symbol Y(n,k) is just the product of the complex gain and the corresponding data symbol X(n,k). • OFDM with a cyclic prefix transforms a frequency￾selective fading channel into K decoupled and perfectly flat fading subchannels! Y(n n n n n ) = + Λ X Z Λ ( ) ( ) ( ) , where is diagonal, ( ) Y n k n k X n k Z n k k K ( , , , , , 0 1. ) = +   −  ( ) ( ) ( )