Power efficient wireless LAN using 16-state trellis-coded modulation for infrared communications

Authors:
Hae Geun Kim
Affiliations:
School of Computer and Information Communication, Catholic University of Daegu, Kyungsan-si, Korea
Venue:
ICCSA'06 Proceedings of the 2006 international conference on Computational Science and Its Applications - Volume Part III
Year:
2006

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Trellis-coded M-ary orthogonal modulation

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Abstract

Optical wireless communication employing 16-state trellis-coded multiple-subcarrier modulation with a fixed bias is introduced, where 4-dimensional vectors having the largest Euclidean distance for 32 signal points are used. After combining coding with the 4-dimensional modulation, the proposed system improves the power and the bandwidth efficiency, significantly. The performance evaluation results are that the normalized power and the bandwidth requirements are reduced up to 6.1 dB and 5.8 dB compared to those of the block codes using QPSK, respectively. The proposed system needs much less power and bandwidth than the counterparts transmitting the same bit rates for optical wireless connection.