Structure of oFDM systems using FFT X(h) x(n) S(1) binary data encoding Guard Lowpass arrier (BPSK IFFT Insertion filtering modulation nanne y(k) y(n y'(n Binary data decoding lowpass (BPSK.) FFT Guard filtering Carrier deleting demodulation converting Channel OFDM symbol estimation synchronisationStructure of OFDM systems using FFT Encoding (BPSK…) IFFT Guard insertion Lowpass filtering Carrier modulation Binary data Channel Carrier demodulation Lowpass filtering A/D converting Guard FFT deleting decoding (BPSK…) Binary data OFDM symbol synchronisation Channel estimation X(k) x(n) x’(n) s(t) y’(k) y(n) y’(n) r(t)