DS-CDMA assisted visible light communications systems

In this contribution we propose and investigate the performance of Direct Sequence Code Division Multiple Access (DS-CDMA) based VLC system using M-ary orthogonal modulation under Additive White Gaussian Noise (AWGN) channel. Various types of spreading code sequences are considered, including the modified binary sequences previously used in wireless CDMA systems and the optical orthogonal code (OOC) which is widely employed in the optical domain. For each code set correlation property is studied for the purpose of predicting whether its corresponding multiple access interference (MAI) is tolerable. Furthermore, sophisticated code designs are proposed to improve the system performance while reducing the overall MAI effect under specified channel conditions. The numerical results show that the performance of optical wireless networks can be enhanced with the proposed spreading code design.

[1]  Mohsen Kavehrad,et al.  Optical code-division-multiplexed systems based on spectral encoding of noncoherent sources , 1995 .

[2]  Tafazolli.  Technologies For The Wireless Future , 2013 .

[3]  Masao Nakagawa,et al.  Indoor visible communication utilizing plural white LEDs as lighting , 2001, 12th IEEE International Symposium on Personal, Indoor and Mobile Radio Communications. PIMRC 2001. Proceedings (Cat. No.01TH8598).

[4]  Zabih Ghassemlooy,et al.  Optical Wireless Communications: System and Channel Modelling with MATLAB® , 2012 .

[5]  Tasshi Dennis,et al.  Optical spectral amplitude CDMA communication , 1997 .

[6]  M. S. Islim,et al.  Short range V2I communication system using wireless optical CDMA , 2012, 2012 20th Telecommunications Forum (TELFOR).

[7]  Jean-Paul M. G. Linnartz,et al.  Optical wireless CDMA employing solid state lighting LEDs , 2009, 2009 IEEE/LEOS Summer Topical Meeting.

[8]  Li Chuanqi,et al.  Performance of OCDMA spectral-amplitude-coding with optical orthogonal codes , 2002, 2002 3rd International Conference on Microwave and Millimeter Wave Technology, 2002. Proceedings. ICMMT 2002..

[9]  Fan Chung Graham,et al.  Optical orthogonal codes: Design, analysis, and applications , 1989, IEEE Trans. Inf. Theory.

[10]  Harald Haas,et al.  An overview of indoor OFDM/DMT optical wireless communication systems , 2010, 2010 7th International Symposium on Communication Systems, Networks & Digital Signal Processing (CSNDSP 2010).

[11]  Chi-Ho Chan,et al.  LED wireless , 2002 .

[12]  Rahim Tafazolli,et al.  Technologies for the Wireless Future: Wireless World Research Forum (WWRF) , 2006 .

[13]  Yan Li,et al.  A construction method of optical orthogonal code based on difference set , 2009, 2009 IEEE International Conference on Network Infrastructure and Digital Content.