Analysis of phase noise effects on time-direction differential OFDM receivers

This paper analyzes the effect of phase noise on orthogonal frequency division multiplexing (OFDM) systems with a focus on time-direction (TD) differential receivers. Both Wiener phase noise and wide-sense stationary (WSS) phase noise are considered. A signal-to-noise ratio (SNR) expression for TD differential receivers is derived in the presence of phase noise and is compared to that for coherent receivers, common phase error correction (CPEC) receivers, and frequency-direction (FD) differential receivers. It is shown that Wiener phase noise affects TD differential receivers more than CPEC receivers and FD differential receivers. On the other hand, for WSS phase noise, the performance of TD differential receivers depends on the shape of the power spectral density of the phase noise and the subcarrier bandwidth. When the power of the phase noise in one subcarrier bandwidth is much smaller than the total power of the phase noise, the performance of TD differential receivers is comparable to that of FD differential receivers