Abstract
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.)
© 2012 IEEE
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