Effect of Varying the Cyclic Prefix Length on OFDM System Performance Over Different Wireless Channel Models

Topic: Enterprise Software
Format: PDF
Cyclic Prefix (CP) is a significant feature of an OFDM waveform. It is used to completely eliminate both Inter-Symbol Interference (ISI) and Inter-Carrier Interference (ICI) as long as the CP length is greater than the channel delay spread. By eliminating the ISI and ICI, the CP compensates for the effect of the multi-path dispersion; but it consumes a considerable amount of the scarce spectrum and the power. Conventional OFDM uses a fixed and large CP length to tolerate worst case channel condition. This paper, however, causes a loss in bandwidth efficiency as well as consumes relatively more transmitter energy.

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