A performance analysis of optical overlapping PPM-CDMA communication systems

Author

Shalaby, Hossam M H

Author_Institution

Sch. of Electr. & Electron. Eng., Nanyang Technol. Inst., Singapore

Volume

17

Issue

3

fYear

1999

fDate

3/1/1999 12:00:00 AM

Firstpage

426

Lastpage

433

Abstract

Direct-detection optical code-division multiple-access (CDMA) systems employing overlapping pulse-position modulation (OPPM) schemes are proposed. Both upper and lower hounds on the bit error rate (BER) are derived taking into account the effect of both multiple-user interference and receiver shot noise. The photodiodes´ dark currents are neglected since their effect is minor. The throughput limitation of this system is evaluated as well. Performance characteristics are then compared to optical CDMA systems employing traditional ON-OFF keying (OOK) and pulse-position modulation (PPM) schemes. It is shown that under fixed data rate and chip time, OPPM-CDMA system superperforms both traditional systems. Moreover, it is shown that the throughput limitation of OPPM-CDMA is almost 6.7 times greater than that of OOK-CDMA

Keywords

code division multiple access; optical fibre communication; optical modulation; optical noise; optical receivers; photodiodes; pulse position modulation; shot noise; ON-OFF keying; OOK; OOK-CDMA; bit error rate; chip time; direct-detection optical CDMA systems; fixed data rate; multiple-user interference; optical CDMA systems; optical overlapping PPM-CDMA communication systems; overlapping pulse-position modulation; performance analysis; photodiode dark currents; pulse-position modulation; receiver shot noise; throughput limitation; Bit error rate; Modulation coding; Multiaccess communication; Optical modulation; Optical noise; Optical pulses; Optical receivers; Performance analysis; Pulse modulation; Throughput;

fLanguage

English

Journal_Title

Lightwave Technology, Journal of

Publisher

ieee

ISSN

0733-8724

Type

jour

DOI

10.1109/50.749382

Filename

749382