An Improved ICI Reduction Method in OFDM Communication System in Presence of Phase Noise

Orthogonal frequency division multiplexing (OFDM) is a promising technique for the broadband wireless communication system. However, the inter-sub-carrier- interference (ICI) produced by the phase noise of transceiver local oscillator is a serious problem. Bit error rate (BER) performance is degraded because the orthogonal properties between the sub-carriers are broken down. In this paper, the number of sub-carriers is chosen according to the consideration of the trade off between the amount of ICI and data rate of the system. ICI self-cancellation of Mapping Method introduced here is also studied to reduce ICI effectively. Then the system performance of the Mapping Method is compared with those of the original OFDM and the conventional data-conversion method.