Study of a Diversity O-CDMA Scheme for Optical Wireless

Author

Chang, Chung-Yu ; Yang, Guu-Chang ; Chang, Cheng-Yuan ; Kwong, Wing C.

Author_Institution

Dept. of Electr. Eng., Nat. Chung Hsing Univ., Taichung, Taiwan

Volume

30

Issue

10

fYear

2012

fDate

5/15/2012 12:00:00 AM

Firstpage

1549

Lastpage

1558

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.)

Keywords

code division multiple access; codes; diversity reception; microwave photonics; radio-over-fibre; code cardinality; diversity O-CDMA; hardware complexity; optical code-division multiple-access scheme; optical wireless; spectral efficiency; Adaptive optics; Error probability; Optical pulses; Optical receivers; Optical transmitters; Passive optical networks; Wireless communication; Diversity; optical code-division multiple access (O-CDMA); optical wireless; spectral efficiency (SE);

fLanguage

English

Journal_Title

Lightwave Technology, Journal of

Publisher

ieee

ISSN

0733-8724

Type

jour

DOI

10.1109/JLT.2012.2186789

Filename

6145590