| | |
Summary: Parity Assisted Decision Making for QAM Modulation
Amer H. Alhabsi, Hussain M. Al-Rizzo and Robert Akl
Abstract
A simple technique which involves the trans-
mission of a Quadrature Amplitude Modulation
(QAM) symbol and two parity bits in separate
channels to improve the performance of commu-
nication systems is devised. When a symbol is
received, a decision is made not solely by its
Euclidean distances to the constellation points.
Rather, the two parity bits are used to assist in
making the decision. Unlike standard error cor-
recting codes (ECC), the proposed method op-
erates on the received symbols at the detector
level and before the ECC. The parity bits and
the information symbols can be sent in differ-
ent channels (frequency division) or at different
times on the same channel (time division). The
available energy for transmission can be distrib-
uted unevenly among the information bits and
|
