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Interconnecting devices in an indoor environment using the illuminationsystem and white light emitting diodes (LED) requires adaptive networkingtechniques that can provide network access for multiple users. Two techniquesbased on multilevel signaling and optical orthogonal codes (OOC) are exploredin this paper in order to provide simultaneous multiple access in an indoormultiuser network. Balanced incomplete block designs (BIBD) are used toconstruct multilevel symbols for M-ary signaling. Using these multilevelsymbols we are able to control the optical peak to average power ratio (PAPR)in the system, and hereby control the dimming level. In the first technique,the M-ary data of each user is first encoded using the OOC codeword that isassigned to that user, and then it is fed into a BIBD encoder to generate amultilevel signal. The second multiple access method uses sub-sets of a BIBDcode to apply multilevel expurgated pulse-position modulation (MEPPM) to thedata of each user. While the first approach has a larger Hamming distancebetween the symbols of each user, the latter can provide higher bit-rates forusers in VLC systems with bandwidth-limited LEDs.

High-Speed Visible Light Indoor Networks Based on Optical Orthogonal Codes and Combinatorial Designs