Simulation Analysis of OFDM System Demodulation Algorithm Based on Hierarchical Decision Feedback

Abstract

According to the problem that the channel is very sensitive to intersymbol interference of multipath propagation and decline feature for orthogonal frequency division multiplexing(OFDM) system on the receiver, which seriously affects the quality of communication. A hierarchical decision feedback equalization algorithm is proposed based on the analysis of spatial diversity and frequency diversity. The algorithm based on subcarrier and each antenna signal is detected by hierarchical frequency domain equalization method until all signals on the antenna are detected, and then MMSE is used to detect the best subcarrier of the signal. The simulation results show that the proposed layered detection technology can effectively improve the performance of the communication system.