ANALYSIS OF THE EFFECT OF PHASE NOISE IN OFDM SYSTEMS

Multicarrier systems are gaining much attention for their possible app lication to the transmission of asynchronous transfer mode (ATM) data packets over indoor radio channels. Due to the high frequency selectiv ity of these channels, at data rate of some tens of Mbits/s multicarri er modulation appears a convenient technique to reduce the intersymbol interference produced by multipath propagation. However, multicarrier modulation exhibits a significant sensitivity to the phase noise of t he oscillator used for frequency down-conversion at the receiver. Ln o rder to give a quantitative measure of such impairment, in this paper we evaluate the impact of the oscillator phase noise on the system per formance and, in particular, four modulation schemes are compared.