Title :
Study of bit-interleaved coded space-time modulation with different labeling
Author :
Zhao, Lu ; Lampe, Lutz ; Huber, Johannes
Author_Institution :
Erlangen-Nurnberg Univ., Erlangen, Germany
Abstract :
A bit-interleaved concatenated coding scheme consisting of an outer convolutional code and an inner space-time modulation together with an iterative decoding-demapping method is analyzed. As a result, two parameters based on bitwise pairwise error probabilities (b-PEP) for the cases with and without a-priori knowledge are proposed as new measures for a labeling of signal points suited to iterative decoding-demapping. In particular, we demonstrate that the two parameters are closely related to the transfer characteristic (TC) of the demapper and accordingly lead to the same design guideline as a TC analysis. By optimizing these two analytical parameters for an orthogonal space-time block code (oSTBC) employing 16QAM constituent symbols w.r.t. an outer simple 4-states rate 1/2 convolutional code, a highly power efficient concatenated scheme with rate of 2 bits per channel use is proposed, which offers an excellent trade off between power efficiency and complexity.
Keywords :
block codes; concatenated codes; convolutional codes; error statistics; interleaved codes; iterative decoding; modulation coding; quadrature amplitude modulation; space-time codes; QAM; bit-interleaved coded space-time modulation; bitwise error probabilities; bitwise pairwise error probabilities; coded modulation; complexity; concatenated coding; convolutional code; iterative decoding-demapping; iterative demapping; orthogonal space-time block code; power efficiency; signal point labeling; transfer characteristic; Block codes; Concatenated codes; Convolutional codes; Guidelines; Interleaved codes; Iterative decoding; Iterative methods; Labeling; Modulation coding; Pairwise error probability;
Conference_Titel :
Information Theory Workshop, 2003. Proceedings. 2003 IEEE
Print_ISBN :
0-7803-7799-0
DOI :
10.1109/ITW.2003.1216729