Enhanced Algorithm for Digital Mitigation of ICI Due to Phase Noise in OFDM Receivers

摘要

In this letter, an enhanced yet computationally efficient algorithm is proposed for suppressing ICI due to phase noise in OFDM receivers. The method is particularly targeted to improve the detection error rate performance when high-order constellation size and long cyclic prefix are used. The approach optimizes the interpolation of estimated excess phase between adjacent OFDM symbols and re-compensates for residual CPE after interpolation. The proposed enhancement is verified in OFDM system with 64-QAM subcarrier modulation and 1/4 cyclic prefix, and shown to outperform state-of-the-art. Implementation complexity and its optimization are also discussed.