TY - GEN
T1 - BER analysis for MIMO BICM-ID assuming finite precision of extrinsic LLR
AU - Wang, Chien Yi
AU - Lai, I. Wei
AU - Chiueh, Tzi Dar
AU - Ascheid, Gerd
AU - Meyr, Heinrich
PY - 2010
Y1 - 2010
N2 - In this paper, we analyze the error rate degradation caused by the finite-precision extrinsic log-likelihood ratio (LLR), i.e., demapper output, for multiple-input multiple-output (MIMO) bit-interleaved coded modulation with iterative decoding (BICM-ID). A closed-form expression for the probability density function (pdf) of the metric difference with finite precision is derived. This pdf is well-approximated by two approaches, namely the pseudo quantization noise (PQN) model and the pdf tail truncation. Moreover, we interpret such performance degradation as an additional signal-to-noise ratio (SNR) loss. As validated by Monte Carlo simulations, this SNR loss can be directly applied at the first iteration, extending our analysis to non-iterative scenario. This work provides a convenient indicator for deciding the LLR precision in real implementations.
AB - In this paper, we analyze the error rate degradation caused by the finite-precision extrinsic log-likelihood ratio (LLR), i.e., demapper output, for multiple-input multiple-output (MIMO) bit-interleaved coded modulation with iterative decoding (BICM-ID). A closed-form expression for the probability density function (pdf) of the metric difference with finite precision is derived. This pdf is well-approximated by two approaches, namely the pseudo quantization noise (PQN) model and the pdf tail truncation. Moreover, we interpret such performance degradation as an additional signal-to-noise ratio (SNR) loss. As validated by Monte Carlo simulations, this SNR loss can be directly applied at the first iteration, extending our analysis to non-iterative scenario. This work provides a convenient indicator for deciding the LLR precision in real implementations.
UR - http://www.scopus.com/inward/record.url?scp=78651309538&partnerID=8YFLogxK
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U2 - 10.1109/ISITA.2010.5649415
DO - 10.1109/ISITA.2010.5649415
M3 - Conference contribution
AN - SCOPUS:78651309538
SN - 9781424460175
T3 - ISITA/ISSSTA 2010 - 2010 International Symposium on Information Theory and Its Applications
SP - 129
EP - 134
BT - ISITA/ISSSTA 2010 - 2010 International Symposium on Information Theory and Its Applications
T2 - 2010 20th International Symposium on Information Theory and Its Applications, ISITA 2010 and the 2010 20th International Symposium on Spread Spectrum Techniques and Applications, ISSSTA 2010
Y2 - 17 October 2010 through 20 October 2010
ER -