Interference Suppression in a MLT Based Spread Spectrum System with Digital Beamforming

Abstract

In this paper, we improve the traditional expanded time and frequency OFDM (ETF-OFDM) system by using Inverse Modulated Lapped Transform (IMLT) / Modulated Lapped Transform (MLT) instead of Inverse Discrete Fourier Transform (IDFT) / Discrete Fourier Transform (DFT) in the OFDM modulation / demodulation part, respectively. For further interference suppression, we adopt the digital beam forming scheme at the transmitter to null-steering the jammings. Simulation results show that the proposed system has better anti-jamming performance than the conventional DFT-based system.