Tone interference suppression in DS-SS systems with modified DFT

Authors:
Yongmei Wei;Guoan Bi;Gang Li
Affiliations:
Block S2, Information Systems Research Lab, School of EEE, Nanyang Technological University, Nanyang Avenue, Singapore 639798, Singapore;Block S1, School of Electrical and Electronic Engineering, Nanyang Technological University, Nanyang Avenue, Singapore 639798, Singapore;College of Information Engineering, Zhejiang University of Technology, Hangzhou, Zhejiang, PR China
Venue:
Signal Processing
Year:
2008

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Abstract

The performance of traditional interference excision methods based on the discrete Fourier transform (DFT) in direct sequence spread spectrum (DS-SS) systems varies significantly with the frequency of the interference because the DFT of the interference becomes more dispersive with the increase of grid biases in the DFT operation. This paper presents a new excision method using modified DFT (MDFT) with an estimated grid bias. Minimum dispersion of the interference is achieved in the MDFT domain. Both theoretical analysis and experimental simulation are presented to show that the interference can be excised with a minimum distortion of the desired signal in a large range of interference-to-signal ratio.