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標題: Study of a Diversity O-CDMA Scheme for Optical Wireless
作者: Chang, C.Y.
Yang, G.C.
Kwong, W.C.
關鍵字: Diversity;optical code-division multiple access (O-CDMA);optical;wireless;spectral efficiency (SE);spectral efficiency;orthogonal codes;beat noise;networks;systems;ocdma
Project: Journal of Lightwave Technology
期刊/報告no:: Journal of Lightwave Technology, Volume 30, Issue 10, Page(s) 1549-1558.
Borrowing from wireless communications, a "diversity" optical code-division multiple-access (O-CDMA) scheme for optical wireless is studied in this paper. The scheme transmits multiple copies of an optical code per data bit of one for improving code performance and spectral efficiency. An approximate performance-analytical model is also formulated for quick computation and comparison with a conventional O-CDMA scheme. Under the assumptions of same code power and hardware complexity, our study finds an important application of the diversity scheme, which circumvents a heavy code-weight requirement (for achieving good code performance) in conventional O-CDMA by transmitting multiple copies of lower weight codes with little penalty in spectral efficiency and without depletion in code cardinality (i.e., the number of possible subscribers.)
ISSN: 0733-8724
DOI: 10.1109/jlt.2012.2186789
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