Title :
Constellation shaping for pragmatic turbo coded modulation
Author :
Raphaeli, D. ; Gurevitz, A.
Author_Institution :
Dept. of Electr. Eng. Syst., Tel Aviv Univ., Israel
fDate :
7/4/2002 12:00:00 AM
Abstract :
A new turbo encoding scheme for high spectral efficiency is proposed. The scheme combines non-uniform signalling on a Gaussian channel, and pragmatic turbo coded modulation. A table is used to map equiprobable input symbols into non-equiprobable points in the QAM constellation. It is shown that the new scheme provides shaping gains of 0.6 and 0.93 dB, at rates 2 and 3 bits/dim, respectively, and reach about 1 dB from the Gaussian channel capacity
Keywords :
Gaussian channels; channel capacity; modulation coding; quadrature amplitude modulation; telecommunication signalling; turbo codes; 0.6 dB; 0.93 dB; Gaussian channel; QAM constellation; channel capacity; constellation shaping; equiprobable input symbols; nonequiprobable points; nonuniform signalling; pragmatic turbo coded modulation; shaping gains; spectral efficiency;
Journal_Title :
Electronics Letters
DOI :
10.1049/el:20020515
