Asynchronous BPPM OCDMA systems with trellis-coded modulation

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

The author discusses the application of spectrally efficient trellis-coded-modulation (TCM) schemes based on set partitioning of the signal set to asynchronous optical-code-division multiple-access (OCDMA) systems employing binary-pulse-position modulation (BPPM) and an optical orthogonal code (OOC). Two techniques to increase the cardinality of the signal set (number of signal points in the signal space diagram) are discussed along with the performance evaluation of OCDMA systems employing TCM based on these techniques. Suitable comparisons are reported between OCDMA systems employing TCM and those which do not. The performance evaluation is done in the presence of multi-user interference (MUI), photon-detection shot noise, detector dark-current noise and circuit thermal noise under the assumption of chip synchronous - bit/symbol asynchronous transmission. The theoretical results show that by using TCM in conjunction with the Viterbi decoding algorithm, considerable enhancement in performance is achievable in asynchronous OCDMA systems, along with a simultaneous enhancement of bandwidth efficiency.

Original languageEnglish
Pages (from-to)193-201
Number of pages9
JournalIEE Proceedings: Optoelectronics
Volume151
Issue number4
DOIs
Publication statusPublished - 08-2004

Fingerprint

pulse position modulation
Pulse position modulation
code division multiple access
Code division multiple access
Modulation
modulation
Shot noise
Thermal noise
augmentation
evaluation
Dark currents
thermal noise
decoding
shot noise
dark current
Decoding
Photons
diagrams
chips
Detectors

All Science Journal Classification (ASJC) codes

  • Atomic and Molecular Physics, and Optics
  • Computer Networks and Communications
  • Electrical and Electronic Engineering

Cite this

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Asynchronous BPPM OCDMA systems with trellis-coded modulation. / Kumar, M. S.

In: IEE Proceedings: Optoelectronics, Vol. 151, No. 4, 08.2004, p. 193-201.

Research output: Contribution to journalArticle

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