Abstract
Preamble-Based MMSE Channel Estimation With Low Pilot Overhead in MIMO-FBMC Systems
Highlights
A S an alternative to the classical orthogonal frequency division multiplexing (OFDM), filter bank multicarrier (FBMC) has drawn much attention [1]–[3] by reason of the high spectral efficiency in harsh environments
We propose a minimum mean square error (MMSE) algorithm for the channel estimation in the MIMOFBMC system, which reduces the pilot overhead obviously and can achieve satisfactory performance in harsh environments with poor signal-to-noise ratio (SNR)
The well-known isotropic orthogonal transform algorithm (IOTA) function is used for the filter in the multiple input multiple output (MIMO)-FBMC system, obtained by [26]
Summary
A S an alternative to the classical orthogonal frequency division multiplexing (OFDM), filter bank multicarrier (FBMC) has drawn much attention [1]–[3] by reason of the high spectral efficiency in harsh environments. Compared with the classical MIMOOFDM, the imaginary interference makes pilot design and estimation algorithm more complicated in MIMO-FBMC systems [6]. In [7], [8], the authors presented an interference approximation method (IAM), based on the construction of pseudo-pilots, to conduct the channel estimation in MIMO-FBMC. We propose a minimum mean square error (MMSE) algorithm for the channel estimation in the MIMOFBMC system, which reduces the pilot overhead obviously and can achieve satisfactory performance in harsh environments with poor signal-to-noise ratio (SNR). By adopting symmetry design, the imaginary interference between nonzero pilots can be removed, and pilot overhead of preamble is reduced compared with the conventional IAM scheme with 5 columns of pilots.
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