Abstract

Orthogonal Frequency Division Multiplexing (OFDM) is mainly designed to combat the effect of multipath reception, by dividing the wideband frequency selective fading channel into many narrow flat sub-channels. OFDM offers flexibility in adaptation to time varying channel condition by adopting the parameters at each subcarrier accurately. To avoid ISI due to multipath, successive OFDM symbols are separated by guard band. This makes the OFDM system resistant to multi-path effects [1].The idea of using parallel data transmission by FDM was published in mid 60s [2].However, recently the attention toward OFDM has grown rapidly in the field of wireless and wired communication systems. This is reflected by the adoption of this technique in applications such as digital audio/video broadcast, wireless LAN (802.11a and HiperLAN2), broadband wireless (802.16) and xDSL [3]. In this paper design of OFDM system transmitter and receiver is introduced and Simulation is done using MATLAB.

Keyword

FFT, IFFT, OFDM, QAM.

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