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Frequency Sweeping Interference Suppressing in DSSS System Using Chirp-Fourier Transform

Lin Qi

Abstract

An algorithm for suppressing the frequency sweeping interference in Direct Sequence Spread Spectrum(DSSS) system using Chirp-Fourier transform is proposed. Chirp-Fourier transform is used as an effective technique for the detection and parameter estimation of chirp signals, and a DSSS receiver with adaptive time-varying filter is presented. The simulations show that remarkable improvement in Bit Error Rate is obtained, and compared with other two-dimensional time-frequency interference suppressing algorithms, it is better in the interference suppressing, and easier in implementation.

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Available abstract

Key concepts: Chirp, Chirp spread spectrum, Direct-sequence spread spectrum, Interference (communication), Spread spectrum, Computer science, Fourier transform, Filter (signal processing)