Iterative compensated MMSE channel estimation in LTE systems

In this paper, an iterative channel estimation algorithm is considered in LTE systems. In order to take advantage of “null” sub-carriers (guard band) in LTE systems and make the algorithm simpler, an iterative compensated MMSE (IC-MMSE) channel estimation algorithm is proposed in frequency domain. Together with a simple “linear interpolation” in time domain, channel estimates are obtained in an iterative way with lower complexity. Theoretical analysis shows that the compensation process does not affect the accuracy of iterative MMSE channel estimation. Simulation results confirm that the proposed channel estimation has very robust performance and approaches the best achievable performance.