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


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 biterror probability of the new scheme is provided which is also con- firmed 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.

Publication type: 
JRC-SCI Magazine
Published in: 
ELECTRONICS LETTERS, Vol.51, 11 pp. 847-849
Print: ISSN 0013-5194 Online: ISSN 1350-911X
Publication date: 
May 2015
CeDInt Authors: 
Other Authors: 
O. González, J.A. Martín-González, M.F. Guerra-Medina, F.A. Delgado-Rajó