Improvement of Channel Estimation Method Based on Preamble Pilot in FBMC System

The traditional channel estimation methods for Filter Bank Multicarrier (FBMC) systems have some drawbacks, such as unreasonable pilot structure settings and poor estimation accuracy. Because FBMC/OQAM systems have inherent imaginary interference, this paper presents two new block pilots based on the traditional channel estimation methods. First, the system is briefly introduced. Because the traditional two-column pairs of pilot method (POP) has poor estimation accuracy and anti-noise performance, the structure of the pilot is reset to reduce noise interference and improve the estimation performance from the basic reason. Then aiming at the interference approximation method (IAM), because of the characteristics of its three-column pilot settings, the equivalent power of the pilot is high, which results in the excessive amplitude of the time-domain pilot signal and the pressure on the RF power amplifier. Therefore, the structure of IAM is modified to effectively suppress the amplitude. The simulation results show that the algorithm presented in this paper has a good bit error rate (BER) performance and small mean square error (MSE).