A PROOF OF CONCEPT IMPLEMENTATION OF AN FFT-BASED EXCISOR

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Authors
  1. Kozminchuk, B.
Corporate Authors
Defence Research Establishment Ottawa, Ottawa ONT (CAN)
Abstract
An FFT-based algorithm for suppressing narrowband interference in direct sequence spread spectrum signals has been implemented across TMS320C30 processors forming part of the Advanced Communications Electronic Support Measures System (ACES). An FFT approach is especially attractive because of its computational economy. The basic problem to be solved is described, followed by a description of the algorithm. 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. One of the laborious aspects of implementing this algorithm (and perhaps any others to be implemented on ACES as a later date) was to efficiently distribute the workload across the three TMS320C30 processors so as to achieve real-time performance; this objective was achieved, although the spread spectrum bandwidths which could be processed were not high. The experience gained will demand the incorporation of efficient ways of reducing the development/testing cycle in the ACES system when attempting to implement algorithms for any signal processing application.
Keywords
FFT-BASED ALGORITHMS;SUPPRESSION
Report Number
DREO-TN-93-16 — Technical Note
Date of publication
01 Sep 1993
Number of Pages
48
DSTKIM No
95-00104
CANDIS No
143924
Format(s):
Hardcopy;Document Image stored on Optical Disk

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