[1] [1] M. Akanegawa, Y. Tanaka, and M. Nakagawa, IEEE Trans. Intell. Transp. Sys. 2, 197 (2001).

[2] [2] P. Xu, C. Xia, F. Wu, X. Li, Q. Sai, G. Zhou, and X. Xu, Chin. Opt. Lett. 10, 021601 (2012).

[3] [3] Z. Liu, P. Liu, and F. Yu, Chin. Opt. Lett. 10, 112201 (2012).

[4] [4] S. Okada, T. Yendo, T. Yamazato, T. Fujii, M. Tanimoto, and Y. Kimura, in Proceedings of IEEE Intelligent Vehicle Symposium. 1033 (2009).

[5] [5] N. Kumar, L. N. Alves, and R. L. Aguiar, in Proceedings of Wireless VITAE 798 (2009).

[6] [6] I. E. Lee, M. L. Sim, and F. W. L. Kung, IET Optoelectron 3, 30 (2009).

[7] [7] S. Iwasaki, C. Premachandra, T. Endo, T. Fujii, M. Tanimoto, and Y. Kimura, in Proceedings of Intelligent Vehicle Symposium 13 (2008).

[8] [8] H. Chinthaka, N. Premachandra, T. Yendo, T. Yamazato, T. Fujii, M. Tanimoto, and Y. Kimura, in Proceedings of the 2009 IEEE Intelligent Vehicle Symposium. 179 (2009).

[9] [9] K. Cui, G. Chen, Z. Xu, and R. D. Roberts, in Proceedings of 2010 7th International Symposium on Communication Systems Networks and Digital Signal Processing (CSNDSP) 621 (2010).

[10] [10] M. D. Audeh and J. M. Kahn, in Proceedings of SUPERCOMM/ICC 2 660 (1994).

[11] [11] K. Cui, G. Chen, Z. Xu, and R. D. Roberts, Appl. Opt. 51, 6594 (2012).