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400 IEEE TRANSACTIONS ON COMMUNICATIONS, VOL. 51, NO. 3, MARCH 2003 Constellation Mappings for Two-Dimensional
 

Summary: 400 IEEE TRANSACTIONS ON COMMUNICATIONS, VOL. 51, NO. 3, MARCH 2003
Constellation Mappings for Two-Dimensional
Signaling of Nonuniform Sources
Glen Takahara, Member, IEEE, Fady Alajaji, Senior Member, IEEE, Norman C. Beaulieu, Fellow, IEEE, and
Hongyan Kuai
Abstract--The design of two-dimensional constellation map-
pings for the transmission of binary nonuniform memoryless
sources over additive white Gaussian noise channels using stan-
dard -ary PSK and QAM modulation schemes is investigated.
The main application of this problem is the incorporation of an
adaptive mapping assignment in modem devices that employ
fixed PSK/QAM modulation schemes for the transmission of
heterogenous data (such as multimedia information) containing
various levels of nonuniformity. In general, the optimal mapping
depends on both the probability distribution of the input signals
and the signal-to-noise ratio (SNR) in the channel, in addition
to the geometry of the signal constellation. We show that con-
stellation mappings which follow the objective of minimizing the
average symbol energy and, given this, maximizing the decoding
probability of the most likely signals, can yield symbol-error-rate

  

Source: Alajaji, Fady - Department of Mathematics and Statistics, Queen's University (Kingston)

 

Collections: Engineering