Computationally efficient phase noise cancellation technique in OFDM systems with phase noise

It has been shown that OFDM is a strong candidate for future high rate wireless communications. One drawback of OFDM is, however, its sensitivity to phase noise, which causes leakage of digital Fourier transform (DFT), leads to common phase error (CPE) as well as intercarrier interference (ICI) in the frequency domain, and therefore saturates system performance. Many methods have been developed in the literature to mitigate phase noise. Among them, a simultaneous CPE and ICI correction (SCIC) technique, which chooses to estimate and cancel CPE and ICI simultaneously, has a better performance than others. Nevertheless, this technique requires much higher computational complexity, mainly due to the matrix inversion. We propose a new SCIC-based method which, while maintaining the same performance as the original scheme, greatly reduces the computational complexity. Numerical results are provided to show the effectiveness of the proposed method.