Title:
Revisiting the Spread Spectrum Sliding Correlator: Why Filtering Matters
Revisiting the Spread Spectrum Sliding Correlator: Why Filtering Matters
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Author(s)
Pirkl, Ryan J.
Durgin, Gregory D.
Durgin, Gregory D.
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Abstract
A wireless channel sounder based upon the conventional
spread spectrum sliding correlator implementation uses
unfiltered pseudo-random noise (PN) at both the transmitter
and receiver to generate a time-dilated copy of the channel’s
impulse response. However, in addition to this desired impulse
response, the sliding correlator also produces a noise-like, wideband
distortion signal that decreases the measurement system’s
dynamic range. Careful selection of the sliding correlator’s lowpass
filter can significantly reduce this distortion, but no amount
of filtering will remove it completely. In contrast, using filtered
PNs at both the transmitter and receiver enables one to remove
this distortion in entirety and realize a measurement system
whose dynamic range closely approximates the theoretical ideal
for spread spectrum systems.
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Date Issued
2009-07
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Proceedings