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Summary: A JOINT MODULATION IDENTIFICATION AND FREQUENCY OFFSET
CORRECTION ALGORITHM FOR QAM SYSTEMS
Evren Terzi
, Hasan B. Celebi
, and Huseyin Arslan
Department of Electrical Engineering, University of South Florida
4202 E. Fowler Avenue, ENB118 Tampa, FL, 33620
E-mails:{eterzi, hbcelebi}@mail.usf.edu, arslan@eng.usf.edu
ABSTRACT
Modulation identification is one of the most challenging
steps for blind receivers. If frequency offset is present in the
system, this process becomes even more difficult. The
proposed method is based on the estimation of the
modulation types for quadrature amplitude modulation
(QAM) even before correcting the frequency offset. The
modulation order is estimated using the probability density
information (pdf) of the amplitude of the received signal. As
carrier frequency offset causes a cumulative rotation for
every successive sample, amplitude variation of the signal
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