Title :
Interference Suppression in a MLT Based Spread Spectrum System with Digital Beamforming
Author :
Feng, Xiaotao ; Shang, Yong
Author_Institution :
Sch. of Electron. Eng. & Comput. Sci., Peking Univ., Beijing, China
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.
Keywords :
OFDM modulation; array signal processing; demodulation; discrete Fourier transforms; frequency modulation; interference suppression; inverse transforms; jamming; radio transmitters; spread spectrum communication; ETF-OFDM system; IDFT; IMLT; demodulation; digital beamforming scheme; expanded time and frequency OFDM system; interference suppression; inverse discrete fourier transform; inverse modulated lapped transform; jamming; null-steering; spread spectrum system; transmitter; Array signal processing; Frequency domain analysis; Interference; Jamming; OFDM; Time domain analysis; Transforms; ETF; MLT; anti-jamming; null-steering;
Conference_Titel :
Information Science and Engineering (ISISE), 2010 International Symposium on
Conference_Location :
Shanghai
Print_ISBN :
978-1-61284-428-2
DOI :
10.1109/ISISE.2010.116
