Effect of imperfect slot synchronization on direct-detection optical synchronous CDMA communication systems with PPM signaling

Kazumi Sato, Tomoaki Ohtsuki, Hideyuki Uehara, Iwao Sasase

Research output: Contribution to journalArticle

9 Citations (Scopus)

Abstract

Effect of imperfect slot synchronization between the transmitter and the receiver on optical synchronous code-division multiple-access (CDMA) systems using pulse position modulation as data modulation (PPM/CDMA) is investigated. Optical orthogonal codes (OOC's) are employed as signature sequences, and parallel optic-fiber delay line encoders and correlators are adopted in the transmitters and the receivers, respectively. The upper bound on the bit error probability of PPM/CDMA is derived under the condition that the receiver slot timing shifts from the transmitter timing clock. The bit error probability performance is evaluated for some values of the number of slots per frame, average signal photocount, and the number of simultaneous users. It is shown that as the number of slots per frame increases, the timing offset should be restricted to be smaller to achieve low bit error probability. Further, when the timing offset is small, the improvement of the bit error probability performance with the increase of the number of slots per frame under the photocount per second constraint is shown to be larger than that under the photocount per symbol constraint.

Original languageEnglish
Pages (from-to)1963-1969
Number of pages7
JournalJournal of Lightwave Technology
Volume14
Issue number9
DOIs
Publication statusPublished - 1996 Sep

Fingerprint

pulse position modulation
code division multiple access
slots
Code division multiple access
telecommunication
synchronism
Communication systems
Synchronization
Transmitters
time measurement
receivers
transmitters
Pulse position modulation
Correlators
Electric delay lines
Fiber optics
transmitter receivers
Clocks
delay lines
coders

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Atomic and Molecular Physics, and Optics

Cite this

Effect of imperfect slot synchronization on direct-detection optical synchronous CDMA communication systems with PPM signaling. / Sato, Kazumi; Ohtsuki, Tomoaki; Uehara, Hideyuki; Sasase, Iwao.

In: Journal of Lightwave Technology, Vol. 14, No. 9, 09.1996, p. 1963-1969.

Research output: Contribution to journalArticle

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