An improved pragmatic turbo encoding scheme for high spectral efficiency using constellation shaping

Dan Raphaeli, Assaf Gurevitz

Research output: Contribution to journalConference articlepeer-review

Abstract

We propose a new turbo encoding scheme for high spectral efficiency with performance close to the Gaussian channel capacity. The scheme combines nonuniform signaling on a Gaussian channel, and pragmatic turbo coded modulation for simple and flexible implementation. A table is used to map equiprobable input symbols into nonequiprobable points in the QAM constellation. It is shown that the new scheme provides shaping gains of 0.6 dB and 0.93 dB, at rates 2 and 3 bits/dim respectively compared to the equiprobable pragmatic turbo coded modulation, and reach about 1 dB from the Gaussian channel capacity.

Original languageEnglish
Pages (from-to)2738-2742
Number of pages5
JournalConference Record - International Conference on Communications
Volume4
StatePublished - 2003
Event2003 International Conference on Communications (ICC 2003) - Anchorage, AK, United States
Duration: 11 May 200315 May 2003

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