A subspace-based method for blind CFO estimation in OFDM systems

Abstract

Recently, a blind subspace channel estimation algorithm in which using only a few received OFDM blocks is proposed. Based on this earlier work, we introduce a novel subspace-based blind carrier frequency offset (CFO) estimation method for OFDM systems. The CFO is obtained by solving the nullspace of the proposed rank-reduced matrix and the CFO estimate is given in closed form. Moreover, we do not make the assumption that the modulation symbols are white or constant-modulus. Simulation results show that the proposed method performs better than the existing methods.