A FAST FOURIER TRANSFORM APPROACH TO INTERFERENCE SUPPRESSION IN DIRECT SEQUENCE SPREAD SPECTRUM SIGNALS

Authors
  1. Kozminchuk, B.
Corporate Authors
Defence Research Establishment Ottawa, Ottawa ONT (CAN)
Abstract
An FFT algorithm is examined with respect to its utility as an interference suppressor in direct sequence spread spectrum communications signals. The basic problem to be solved is described, followed by a description of the algorithm. The algorithm consists of power spectrum estimation using an FFT-based routine, interpolation of the power spectrum at equally-spaced points different from those calculated by the FFT, and design of an FIR linear filter which filters the data, i.e., suppresses the interference. This technique is feasible so long as the bandwidth of the interference during the observation time over which the FFT is calculated is much less than the bandwidth of the spread spectrum signal. An important result from this brief study is that the interpolation algorithm used can have an effect on the performance and reliability of the suppression filter ultimately designed and that for small order filters, the discrete Fourier transform approach may be better.
Report Number
DREO-TN-93-2 — Technical Note
Date of publication
01 Dec 1992
Number of Pages
52
DSTKIM No
94-01229
CANDIS No
129000
Format(s):
Hardcopy;Originator's fiche received by DSIS

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