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Proceedings Paper

Analysis of PPM-CDMA and OPPM-CDMA communication systems with new optical code
Author(s): F. Liu; H. Ghafouri-Shiraz
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Paper Abstract

A novel type of optical spreading sequences, named the 'new-Modified Prime Code (nMPC)', is proposed for use in synchronous direct-detection optical code-division multiple-access (CDMA) systems which employ both pulse position modulation (PPM) and overlapping pulse position modulation (OPPM) schemes. The upper bounds on the bit error rate (BER) for nMPC used in PPM-CDMA systems are derived and compared with the respective systems, using a modified prime code (MPC) and a padded modified prime code (PMPC). The nMPC is further applied to the OPPM-CDMA system and the system with a proposed interference cancellation scheme. Our results show that under the same conditions the PPM-CDMA system performances are more improved with the use of nMPC than with the two other traditional codes. Moreover, they show that the system performances are significantly enhanced by the proposed interference reduction methods, if the nMPC is used in the OPPM-CDMA systems.

Paper Details

Date Published: 9 December 2005
PDF: 9 pages
Proc. SPIE 6021, Optical Transmission, Switching, and Subsystems III, 602137 (9 December 2005); doi: 10.1117/12.635459
Show Author Affiliations
F. Liu, The Univ. of Birmingham (United Kingdom)
H. Ghafouri-Shiraz, The Univ. of Birmingham (United Kingdom)

Published in SPIE Proceedings Vol. 6021:
Optical Transmission, Switching, and Subsystems III
Rodney S. Tucker; Dominique Chiaroni; Wanyi Gu; Ken-ichi Kitayama, Editor(s)

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