Title

Broadband interference excision in spread spectrum communication systems via fractional Fourier transform

Document Type

Conference Proceeding

Date of Original Version

12-1-1998

Abstract

We demonstrate the use of the fractional Fourier transform (FRFT) in excising broadband, linear FM (chirp) type interferences in spread spectrum communication systems. Our method is predicated on the fact that the FRFT perfectly localizes a linear FM signal as an impulse when the angle parameter of the transform matches the sweep rate (chirp rate) of the linear chirp signal. Therefore, a transform domain thresholding can often eliminate linear-FM type interferences without severely affecting the desired part of the received signal. Thus, we propose a preprocessing of the received signal by an FRFT-based excision scheme prior to demodulation. Our simulations demonstrate that this technique often improves the bit error performance of the receiver when compared to the case where there is no preprocessing.

Publication Title

Conference Record of the Asilomar Conference on Signals, Systems and Computers

Volume

1

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