Cyclic code-shift extension keying for multi-user optical wireless communications

• Published in: Electronics letters 2015-05, Vol.51 (11), p.847-849
• Main Authors: Gonzalez, O, Martin-Gonzalez, J A, Guerra-Medina, M F, Lopez-Hernandez, F J, Delgado-Rajo, F A
• Format: Article
• Language: English
• Subjects: asynchronous multiuser optical wireless communications; bit‐error probability; code division multiple access; cyclic codes; cyclic code‐shift extension keying; error statistics; Keying; Multiple access; multiple access method; OCDMA scheme; optical code‐division multiple access scheme; Optical communication; optical transmitters; Receivers; simultaneous transmitters; Strategy; Symbols; Transmitters; Upper bounds; visible light communications; Wireless communication
• ISSN: 0013-5194; 1350-911X; 1350-911X
• DOI: 10.1049/el.2014.4417

An optical code-division multiple access (OCDMA) scheme based on cyclic shift extension of a base code is proposed to enable asynchronous multi-user optical wireless communications for very populated scenarios. This multiple access method is convenient for low–medium data rate communications of a large number of simultaneous transmitters. An expression to obtain a tight upper bound of the bit-error probability of the new scheme is provided which is also confirmed by experimental results. A variant of the proposed communication method which allows the encoding of several bits per symbol is also presented, although its analysis demonstrates that the first simpler strategy reaches similar performance with a significantly lower receiver complexity.