Classification of Digital Modulation Types in Multipath Environments

Classification of Digital Modulation Types in Multipath Environments by George Hatzichristos

Title: Classification of Digital Modulation Types in Multipath Environments
Author: George Hatzichristos
ISBN10: 1423530152
ISBN13: 978-1423530152
Publisher: Storming Media (2001)
Language: English
Subcategory: -
Size PDF: 1856 kb
Size Fb2: 1438 kb
Rating: 3.7/5
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Pages: -
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Classification of Digital Modulation Types in Multipath Environments by George Hatzichristos


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This is a NAVAL POSTGRADUATE SCHOOL MONTEREY CA report procured by the Pentagon and made available for public release. It has been reproduced in the best form available to the Pentagon. It is not spiral-bound, but rather assembled with Velobinding in a soft, white linen cover. The Storming Media report number is A018093. The abstract provided by the Pentagon follows: As the expansion of digital communication applications still continues, the need for automated classification of digital modulation types increases. This study attempts to give a partial solution to this problem by proposing a classification scheme which identifies nine of the most popular digital modulation types; namely 2-FSK, 4-FSK, 8-FSK, 2-PSK, 4-PSK, 8-PSK, 16- QAM, 64-QAM and 256-QAM. Higher-order statistics parameters are selected as class features, and a hierarchical neural network-based classifier set-up proposed for the identification of all modulation types considered except those within the M-QAM family. Specific M-QAM types identification is obtained via equalization-based schemes. This study considers the effects due to real-world multipath propagation channels and additive white Gaussian noise. Results show a consistent overall classification performance of at least 68% for severe multipath propagation models and for SNR levels as low as 11dB.