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Orthogonal Frequency Division Multiplexing (OFDM) is a transmission techniquethat uses several subcarrier frequencies (multicarrier) that are perpendicularto each other (orthogonal). This OFDM modulation technique effectivelyeliminates Intersymbol Interference (ISI) on a channel caused by the effects ofmultipath fading. To overcome this weakness, OFDM uses a guard interval (cyclicprefix) inserted in its transmission. This paper analyses the effect ofdifferent cyclic prefix lengths on OFDM performance on multipath channels usingMatlab. Here, the cyclic prefix length as the main parameter is varied for thedifferent number of subscribers. Meanwhile, Bit Error Rate (BER) and SignalNoise Ratio (SNR) values obtained at the receiver are used to see the system'sperformance. Based on our simulation results, the best value of BER is obtainedusing a cyclic prefix length of 1/4 with a Fast Fourier Transform (FFT) size of512.

Performance of OFDM System against Different Cyclic Prefix Lengths on Multipath Fading Channels