Expand this Topic clickable element to expand a topic
Skip to content
Optica Publishing Group
  • Journal of Lightwave Technology
  • Vol. 27,
  • Issue 14,
  • pp. 2771-2778
  • (2009)

Spectral Efficiency Study of Two Multirate Schemes for Asynchronous Optical CDMA

Not Accessible

Your library or personal account may give you access

Abstract

Multirate transmission techniques, such as multiple-code (MC) and multicode-keying (MK) schemes, have been proposed for asynchronous optical code-division multiple-access (O-CDMA) systems supporting multimedia services. A user in the MC scheme transmits several codes at the same time to represent the transmission of several data bit ones. The number of parallel codes transmitted at a time is proportional to the user's bit rate and the number of data bit ones. While the MK scheme only transmits one code at a time, each code represents a symbol and each transmitted symbol represents multiple data bits. Data rate is varied by changing the symbol size, which, in turn, changes the number of data bits per baud, similar to MODEM communications. In this paper, the spectral efficiencies (SEs) of these two asynchronous schemes are derived for the comparison of their performances and efficiencies as a whole. The SE of the conventional single-rate on-off-keying (OOK) O-CDMA scheme is also derived for a baseline comparison. Our numerical results show that the MC scheme always has a better SE than the single-rate OOK scheme, while the MK scheme can have a better SE than the single-rate OOK scheme under certain conditions.

© 2009 IEEE

PDF Article
More Like This
Design of a Hybrid Multirate Asynchronous O-CDMA System: Performance, Spectral Efficiency, and Throughput Analyses

Han-Chun Chen, Min-Kuan Chang, Guu-Chang Yang, and Wing C. Kwong
J. Opt. Commun. Netw. 7(11) 1034-1048 (2015)

Extended 2D Codes Supporting Multirate and QoS in Optical CDMA Networks With Poisson and Binomial MAI Models

Sicheng Zou, Mohammad Masoud Karbassian, and Hooshang Ghafouri-Shiraz
J. Opt. Commun. Netw. 5(5) 524-531 (2013)

Reducing the Dispersion Effects in Multiwavelength Optical CDMA Systems by Using MCM Signaling

Ngoc T. Dang and Anh T. Pham
J. Opt. Commun. Netw. 2(11) 967-974 (2010)

Cited By

You do not have subscription access to this journal. Cited by links are available to subscribers only. You may subscribe either as an Optica member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access Optica Member Subscription

Select as filters


Select Topics Cancel
© Copyright 2024 | Optica Publishing Group. All Rights Reserved