An Improved Bit-Interleaved Turbo-Coded Modulation Scheme using Constellation Shaping and Iterative Decoding

Konferenz: TURBO - CODING - 2006 - 4th International Symposium on Turbo Codes & Related Topics; 6th International ITG-Conference on Source and Channel Coding
03.04.2006 - 07.04.2006 in Munich, Germany

Tagungsband: TURBO - CODING - 2006

Seiten: 6Sprache: EnglischTyp: PDF

Persönliche VDE-Mitglieder erhalten auf diesen Artikel 10% Rabatt

Goff, Stéphane Y. Le; Khoo, Boon Kien; Tsimenidis, Charalampos C.; Sharif, Bayan S. (School of Electrical, Electronic, and Computer Engineering, University of Newcastle upon Tyne, NE1 7RU, UK)

We present an improved version of the bitinterleaved turbo-coded modulation (BITCM) scheme with constellation shaping originally introduced in "S. Y. Le Goff, B. S. Sharif, S. A. Jimaa, Bit-interleaved turbocoded modulation using shaping coding". Simulation results carried out on a 3-bit/dim 16-PAM BITCM indicate that, by implementing an iterative decoding algorithm at the receiver side, it is possible to obtain shaping gains almost equal to 0.8 dB, which is very close to the maximal achievable values predicted by theory. It is also shown that, in most practical cases, the receiver structure can be simplified by removing the demapper from the iterative decoding loop, without any performance degradation.