Preamble-Based LMMSE Channel Estimation in OFDM/OQAM Modulation

This paper presents a preamble-based linear minimum mean square error (LMMSE) estimation technique for filter bank multicarrier (FBMC) modulations. Orthogonal frequency division multiplex (OFDM) systems have been extensively used in digital communication systems, for they are extremely efficient in terms of channel estimation and equalization. Estimation being a crucial part of digital communication systems, techniques have been developed to reduce the impact of noise on the channel estimation process, the optimal one being the LMMSE one. Until recently, non-orthogonal multicarrier modulations such as FBMC, were unable to use OFDM-like estimation techniques due to the non-orthogonality. The interference approximation method (IAM) is one of the most popular method among preamblebased estimation techniques with a limited complexity. This paper present a combination of IAM and a LMMSE-based algorithm that makes possible to achieve a LMMSE estimation in FBMC.