Abstract
In this paper, we analyze the physical layer abstraction for bit interleaved coded orthogonal frequency division multiplexing (BIC-OFDM) system from a parallel bit channel perspective. By combining the exponential effective SNR (signal-to-noise ratio) mapping (EESM) with the maximum a posteriori (MAP) algorithm, a bit LLR (log-likelihood ratio) wise EESM (BL-EESM) method is proposed. This method can abstract the link performance with high accuracy, especially for the case when channel estimation is imperfect. Afterward, the BL-EESM method is simplified by utilizing the non-linear quantization idea, which can reduce the times of exponential operation by two orders of magnitude at wide system bandwidth, yet shows little loss in accuracy. Our proposal can be applied to both system level simulations to save the time consumption and to practical terminals to facilitate the adaptive modulation and coding (AMC) procedure, bringing about throughput improvement at low hardware cost.
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References
Tsai S S, Soong A C K. Effective-SNR mapping for modeling frame error rates in multiple-state channels [R]. SanDiego, California: Ericsson, 2003.
Song H, Kwan R, Zhang J. General results on SNR statistics involving EESM-based frequency selective feedbacks [J]. IEEE Transaction on Wireless Communication, 2010, 9(5): 1790–1798.
Song H, Kwan R, Zhang J. Approximations of EESM effective SNR distribution [J]. IEEE Transaction on Communication, 2011, 59(2): 603–612.
Donthi S N, Mehta N B. An accurate model for EESM and its application to analysis of CQI feedback schemes and scheduling in LTE [J]. IEEE Transaction on Wireless Communication, 2011, 10(10): 3436–3448.
He X, Niu K, He Z Q, et al. Link layer abstraction in MIMO-OFDM system [C]//International Workshop on Cross Layer Design. Jinan, China: IEEE, 2007: 41–47.
RUNCOM Technologies LTD. Generalized EESM system and method [P]. USA: PCT/IL 2008/001659, 2010-03-11.
Sung C K, Chung S Y, Heo J, et al. Adaptive bitinterleaved coded OFDM with reduced feedback information [J]. IEEE Transaction on Communication, 2007, 55(9): 1649–1655.
Pan Z, Zhou Y Q, Chihlin I. Bit-wise exponential ESM (B-EESM) method for accurate link level performance evaluation [C]// International Conference on Communication. Dresden, Germany: IEEE, 2009: 1–5.
Sayana K, Zhuang J, Stewart K. Short term link performance modeling for ML receivers with mutual information per bit metrics [C]// IEEE GlobeComm 2008. LA, New Orleans: IEEE, 2008: 1–6.
Mehlführer C, Wrulich M, Ikuno J C, et al. Simulating the long term evolution physical layer [C]//17th European Signal Processing Conference (EUSIPCO 2009). Glasgow, Scotland: EURASIP, 2009: 1471–1478.
Kyösti P, Meinilä J, Hentilä L, et al. IST-4-027756 Winner II D1.1.2 V1.2: Winner II channel models [R]. Munich, Germany: Winner, 2007.
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Foundation item: the Shanghai Basic Research Key Project (No. 11DZ1500206) and the National Science and Technology Major Project of China (No. 2012ZX03001013-003)
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Li, Ms., Yu, H., Luo, Hw. et al. Pragmatic physical layer abstraction method based on bit-LLR-wise exponential effective SNR mapping for bit interleaved coded orthogonal frequency division multiplexing system. J. Shanghai Jiaotong Univ. (Sci.) 19, 173–180 (2014). https://doi.org/10.1007/s12204-014-1487-5
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DOI: https://doi.org/10.1007/s12204-014-1487-5
Key words
- physical layer abstraction
- parallel bit channel
- signal-to-noise ratio (SNR)
- exponential effective SNR mapping (EESM)
- adaptive modulation and coding (AMC)
- quantization