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2008-05-30
Broadband Interference Excision in Spread Spectrum Communication Systems Based on Short-Time Fourier Transformation
By
Progress In Electromagnetics Research B, Vol. 7, 309-320, 2008
Abstract
An interference excision algorithm in direct-sequence spread spectrum (DS-SS) communication systems is introduced. The proposed excision algorithm is developed for linear frequency modulated (LFM) signals that have broadband frequency characteristics. It is based on the time-frequency analysis of received signals employing short-time Fourier transformation (STFT). To analyze the interference, STFT of the received signal block is evaluated and thresholded. The interference detection is followed by an inverse-STFT computation to estimate the high-power jamming signal. The estimated jammer is then mitigated before demodulation. Simulations present adequate interference estimation results with mean estimation errors less than 0.01%. Various scenarios with different jammer-to-signal ratios (JSRs) and signal-to-noise ratios (SNRs) vs. bit error rates (BERs) are presented for single and multi-component LFM signals. Interference excision algorithms improve the system performance more than an order of magnitude.
Citation
Sultan Aldirmaz, and Lutfiye Durak, "Broadband Interference Excision in Spread Spectrum Communication Systems Based on Short-Time Fourier Transformation," Progress In Electromagnetics Research B, Vol. 7, 309-320, 2008.
doi:10.2528/PIERB08050803
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