PHASE NOISE EFFECTS AND ITS COMPUTATIONALLY EFFICIENT REDUCTION TECHNIQUE IN OFDM SYSTEM

Orthogonal frequency division multiplexing (OFDM) systems, is one of the future of high rate wireless communications, exhibit great sensitivity to the effects of phase noise and the time-varying propagation channel, which can introduce inter-channel interference (ICI) due to the loss of orthogonality among subcarriers and common phase error (CPE) which causes the rotation of constellation. The presence of phase noise can reduce the signal to noise ratio (SNR) at the receiver, and hence reduce the bit error rate (BER) and data rate. There are various methods of phase noise mitigation already proposed in the literature but are of high complexity. In this paper a computationally efficient technique has been proposed, both by theory and computer simulations of the proposed scheme are shown which can effectively mitigate the effect caused by phase noise and improve the BER of OFDM systems.