In this section the block diagram of OFDM will be described. From figure at first the bits are passed through a serial to parallel converter. The output of the converter then passed through an encoder. From here we got the N sub channels. Then the signal passed through IFFT for inverse Fast Fourier Transform. From the output of N-IFFT the signal cyclic prefix added. Then the signal is passed through parallel to serial converter. After that the serial data passed through Digital to analog filter and then to antenna port.