Spectral efficiency of unipolar SAC-OCDMA system considering noise effects

Author

Al-Khafaji, Hamza M R ; Aljunid, S.A. ; Fadhil, Hilal A.

Author_Institution

Sch. of Comput. & Commun. Eng., Univ. Malaysia Perlis (UniMAP), Kangar, Malaysia

fYear

2011

fDate

25-28 Sept. 2011

Firstpage

218

Lastpage

222

Abstract

In this paper, we evaluate the spectral efficiency of unipolar spectral-amplitude coding optical code-division multiple access (SAC-OCDMA) system operating with incoherent sources in the present of intensity, shot, and receiver thermal noises. The spectral efficiency achievable by four SAC codes such as Hadamard, modified quadratic congruence (MQC), balanced incomplete block design (BIBD) and zero cross-correlation (ZCC) is evaluated and compared against the number of active users and code length for a bit error rate (BER) of 10^-10. Analytical results indicated that ZCC code can support more users and leads to the best achievable spectral efficiency than other SAC codes considered. Moreover, the effect of shot and receiver thermal noise degrades the SAC-OCDMA system performance, e.g., when the number of users equal to 80, ZCC has 1.8 dB spectral efficiency penalty by considering these noises as additional to intensity noise.

Keywords

Hadamard codes; block codes; code division multiple access; code division multiplexing; error statistics; optical receivers; thermal noise; BER; BIBD code; Hadamard code; MQC code; ZCC code; balanced incomplete block design code; bit error rate; modified quadratic congruence code; noise effect; noise figure 1.8 dB; spectral efficiency; thermal noise receiver; unipolar SAC-OCDMA system; unipolar spectral-amplitude coding optical code-division multiple access system; zero cross-correlation code; Bandwidth; Educational institutions; Noise; Optical attenuators; Optical noise; Optical receivers; Intensity noise; Multiple access interference (MAI); Optical code-division multiple access (OCDMA); Spectral efficiency; Spectral-amplitude coding (SAC);

fLanguage

English

Publisher

ieee

Conference_Titel

Industrial Electronics and Applications (ISIEA), 2011 IEEE Symposium on

Conference_Location

Langkawi

Print_ISBN

978-1-4577-1418-4

Type

conf

DOI

10.1109/ISIEA.2011.6108702

Filename

6108702