Effects of video bandwidth on the performance of a square law detector with Gaussian IF and video filters.
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Authors
Chang, Long Wee
Subjects
Advisors
Wadsworth, Donald v.Z.
Date of Issue
1991-09
Date
Publisher
Monterey, California. Naval Postgraduate School
Language
en_US
Abstract
The effects of Gaussian-shaped IF and video filters on the
performance of a square-law detector employing post-detection
integration are analyzed. The number of additional noise-only
samples that are integrated due to a finite video bandwidth is
determined. Emerson's method is used to obtain an expression
for the cumulants of the output probability density function.
These cumulants are used in Edgeworth's asymptotic series
expansion of the density functions. By integrating these
density functions, the receiver operating characteristics are
determined for various ratios of IF bandwidth to video
bandwidth. A collapsing ratio which takes into account the
Gaussian shape of the filters is formulated and compared against Barton's approximate formula for the collapsing ratio.
For typical video bandwidths, Barton's approximate formula is
found to overestimate the collapsing loss by an amount less
than 0.5 dB.
Type
Thesis
Description
Series/Report No
Department
Electrical Engineering
Organization
Naval Postgraduate School
Identifiers
NPS Report Number
Sponsors
Funding
Format
64 p.;28 cm.
Citation
Distribution Statement
Approved for public release; distribution is unlimited.