Hierarchical digital modulation classification using cumulants
Swami, A.
Sadler, B.M.
Army Res. Lab., Adelphi, MD;
This paper appears in: Communications, IEEE Transactions on
Publication Date: Mar 2000
Volume: 48,
Issue: 3
On page(s): 416-429
ISSN: 0090-6778
References Cited: 32
CODEN: IECMBT
INSPEC Accession Number: 6562640
Digital Object Identifier: 10.1109/26.837045
Current Version Published: 2002-08-06
Abstract
A simple method, based on elementary fourth-order cumulants, is
proposed for the classification of digital modulation schemes. These
statistics are natural in this setting as they characterize the shape of
the distribution of the noisy baseband I and Q samples. It is shown that
cumulant-based classification is particularly effective when used in a
hierarchical scheme, enabling separation into subclasses at low
signal-to-noise ratio with small sample size. Thus, the method can be
used as a preliminary classifier if desired. Computational complexity is
order N, where N is the number of complex baseband data samples. This
method is robust in the presence of carrier phase and frequency offsets
and can be implemented recursively. Theoretical arguments are verified
via extensive simulations and comparisons with existing approaches
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