Improved Baseband Mapping Method for G3 OFDM Technology

Abstract:

G3-PLC, an orthogonal frequency division multiplexing (OFDM) power line communication solution, has recently gained a lot of attention. It supports the application of four types of baseband mapping modes in different environments. These modes typically require a hard-decision demodulation, which will lead to nearly 3dB preference loss. In this paper, we propose an improvement scheme for the baseband mapping modes by changing the constellation encoding method. The optimal soft decision algorithm which makes use of log likelihood ratio (LLR) of the probabilities is used in the demodulators. Simulation results show that the proposed scheme can outperformer many existing algorithms.

• Periodical: Applied Mechanics and Materials (Volumes 385-386)
• Pages: 1318-1321
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.385-386.1318
• Online since: August 2013
• Authors: Zhi Ru Gu, Da Wei Liu, Hong Li Liu, Kun Xu
• Keywords: AMR, LLR, Orthogonal Frequency Division Multiplexing (OFDM), Programmable Logic Controller (PLC), Soft Decision

References

[1] Electricity metering – Data exchange for meter reading, tariff and load control – Part 62: Interface classes, IEC62056-62, Second edition, pp.42-67, (2006).

DOI: 10.3403/02606953u

[2] M. Hoch, Comparison of PLC G3 and PRIME, IEEE International Symposium on Power Line Communications and its Applications. (ISPLC), pp.165-169, May (2011).

DOI: 10.1109/isplc.2011.5764384

[3] PLC G3 Physical Layer Specification, ERDF. [Online]. Available: http: /www. erdfdistribution. fr/medias/Linky/PLC_G3_Physical_Layer_Specifica-tion. pdf.

[4] K. Razazian, M. Umari, A. Kamalizad, Error correction mechanism in the new G3-PLC specification for powerline communication, IEEE International Symposium on Power Line Communications and Its Applications. (ISPLC), pp.50-55, March 28-31, (2010).

DOI: 10.1109/isplc.2010.5479944

[5] Divsalar D and Simon M K, Multiple-Symbol Differential Detection of MPSK, IEEE Transactions on Communications, vol. 38(3), Mar. (1990).

DOI: 10.1109/26.48887

[6] Hagenauer J and Hoeher P. A Viterbi Algorithm with Soft_Decision Outputs and its Applications (1989).

DOI: 10.1109/glocom.1989.64230

[7] Wang, X. A. and Wicker, S. B., A soft-output decoding algorithm for concatenated systems, IEEE Transactions on Information Theory, vol. 42(2), pp.543-553, (1996).

DOI: 10.1109/18.485723

[8] K. Razazian, M. Umari, A. Kamalizad, V. Loginov and M. Navid, G3-PLC Specification for Powerline Communication: Overview, System Simulation and Field Trial Results, IEEE International Symposium on Power-Line Communications and its Applications. (ISPLC), pp.313-318 , Mar (2010).

DOI: 10.1109/isplc.2010.5479881

[9] Il Han Kim, B. Varadarajan and A. Dabak  Performance analysis and enhancements of narrowband OFDM powerline communication systems, First IEEE International Conference on Smart Grid Communications,  pp.362-367 (2010).

DOI: 10.1109/smartgrid.2010.5622070