Phase Noise Estimation In Time Domain For OFDM System

The Orthogonal Frequency Division Multiplexing (OFDM) system is sensitive to the phase noise (PN), which is usually generated by various radio frequency (RF) devices. The PN leads to the common phase error (CPE) and intercarrier interference (ICI), which breaks the orthogonality among subcarriers and degrades the performance of the system. In this paper, the maximum a posteriori-Gaussian elimination (MAP-GE) method is proposed. The PN is modeled as the Wiener process and the maximum a posteriori (MAP) estimation criterion is derived for the joint estimation of transmitted signals and PN based on the Bayesian theory. In addition, the linear approximation of MAP estimation is equivalent to solving a tridiagonal linear equation, which can be solved exactly by the Gaussian elimination (GE) method with low complexity. The simulation results demonstrate the superiorities of the proposed method in terms of high accuracy and low computation consumption.