A Time/Frequency Spectral Based Approach to Filtering

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Authors
  1. Read, W.J.L.
Corporate Authors
Defence R&D Canada - Ottawa, Ottawa ONT (CAN)
Abstract
This report describes a new filtering approach suitable for demodulating narrowband signals captured in digital wideband data. The new approach is based on generating the filtered and downconverted baseband signals using time/frequency spectral data, rather than the input wideband data. For communications electronic support measures systems, this spectral data will normally be generated to facilitate signal detection and parameter estimation (i.e. frequency, bandwidth, bearing, etc.). Hence the new approach is able to take good advantage of this to reduce the overall number of computations. Through comparisons with more traditional FIR filtering techniques, it is shown that the new spectral filtering approach is computationally more efficient when multiple signals are to be simultaneously demodulated.

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Report Number
DRDC-OTTAWA-TM-2005-198 — Technical Memorandum
Date of publication
01 Dec 2005
Number of Pages
30
DSTKIM No
CA029049
CANDIS No
527295
Format(s):
CD ROM

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