Low decoding complexity STBC design for turbo coded broadcast transmission

Ammar El Falou (1, 2) , Charbel Abdel Nour (3, 1) , Charlotte Langlais (3, 1) , Catherine Douillard (3, 1)

1 ELEC - Département Electronique
2 Lab-STICC - Laboratoire des sciences et techniques de l'information, de la communication et de la connaissance (UMR 3192)
3 Lab-STICC_TB_CACS_IAS

In this paper, we study the Space Time Block Code (STBC) called Matrix D (MD) that enjoys low-complexity detection for broadcast transmission. Such a transmission uses a powerful channel code like a turbo code. To produce Log-Likelihood Ratio (LLR) for the channel decoder, we propose a soft Maximum Likelihood (ML) detector for MD STBC while keeping the same low-complexity order as the original one. Then, we optimize the MD STBC for low Signal to Noise Ratio (SNR) under the trace criterion. The performance of the concatenation of a turbo code with optimized MD is given. A gain of almost 0.2 dB is obtained between optimized MD and original MD. However, the proposed code loses its full-diversity as its determinant is equal to 0. Then, a tradeoff angle is chosen and a low-complexity detection full-rate full-diversity STBC is designed for turbo coded broadcast transmission which performs well for both low and high SNR.

Domaines: Electronique; Traitement du signal et de l'image [eess.SP]

Ammar El Falou, Charbel Abdel Nour, Charlotte Langlais, Catherine Douillard. Low decoding complexity STBC design for turbo coded broadcast transmission. IEEE International Symposium on Broadband Multimedia Systems and Broadcasting, Jun 2011, Erlangen, Germany. ⟨hal-00609525⟩