Interference Analysis for OFDM Transmissions in the Presence of Time-Varying Channel Impairments

Abstract

This paper is concerned with the detrimental effect of phase noise on the performance of orthogonal frequencydivision multiplexing (OFDM) transmissions over time-selective channels. In the literature, most of the existing papersanalyze the performance of OFDM systems in the presence of either time-selective channels or phase noise. Unlike theexisting studies, this paper formulates an approximate expression of signal-to-interference-plus-noise ratio (SINR) at anOFDM receiver in the presence of both phase noise and time-selective channel response. The formulated SINR expressioncan be used as a guideline in determining appropriate OFDM transmission settings under a given quality-of-service (QoS)requirement. To illustrate the tightness of the approximate SINR formulation, empirical and theoretical values of SINRunder different OFDM system settings are presented in this paper.