Multilevel and trellis coded modulation in asynchronous FOCDMA networks

M. S. Kumar, K. N H Bhat, G. Umesh

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

An asynchronous fibre optic code division multiple access (FOCDMA) network employing multilevel modulation for data transmission is investigated. Symbol error probability (SEP) of the network is evaluated assuming the use of optical orthogonal code (OOC) and a double hard-limited, passive correlation PIN diode detector receiver. The SEP is evaluated in the presence of multiple access interference (MAI), detector dark current noise, photon detection quantum noise, and circuit thermal noise. Use of spectrally efficient trellis coded modulation (TCM) techniques based on set partitioning of the signal constellation to enhance the FOCDMA network SEP performance in the presence of these performance degradation sources is also discussed along with the transmitter and receiver architectures for realising multilevel modulation with four levels of modulation and four-state, eight-point TCM techniques in the network. Results show that use of multilevel and TCM techniques in asynchronous FOCDMA networks can result in significant improvement in performance and in bandwidth efficiency compared to uncoded conventional (two-level OOK modulated) asynchronous FOCDMA networks.

Original languageEnglish
Pages (from-to)210-218
Number of pages9
JournalIEE Proceedings: Optoelectronics
Volume150
Issue number3
DOIs
Publication statusPublished - 06-2003

Fingerprint

code division multiple access
Code division multiple access
Fiber optics
fiber optics
Modulation
modulation
receivers
Quantum noise
Detectors
multiple access
Multiple access interference
Thermal noise
constellations
Dark currents
detectors
thermal noise
data transmission
dark current
Data communication systems
transmitters

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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Multilevel and trellis coded modulation in asynchronous FOCDMA networks. / Kumar, M. S.; Bhat, K. N H; Umesh, G.

In: IEE Proceedings: Optoelectronics, Vol. 150, No. 3, 06.2003, p. 210-218.

Research output: Contribution to journalArticle

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AB - An asynchronous fibre optic code division multiple access (FOCDMA) network employing multilevel modulation for data transmission is investigated. Symbol error probability (SEP) of the network is evaluated assuming the use of optical orthogonal code (OOC) and a double hard-limited, passive correlation PIN diode detector receiver. The SEP is evaluated in the presence of multiple access interference (MAI), detector dark current noise, photon detection quantum noise, and circuit thermal noise. Use of spectrally efficient trellis coded modulation (TCM) techniques based on set partitioning of the signal constellation to enhance the FOCDMA network SEP performance in the presence of these performance degradation sources is also discussed along with the transmitter and receiver architectures for realising multilevel modulation with four levels of modulation and four-state, eight-point TCM techniques in the network. Results show that use of multilevel and TCM techniques in asynchronous FOCDMA networks can result in significant improvement in performance and in bandwidth efficiency compared to uncoded conventional (two-level OOK modulated) asynchronous FOCDMA networks.

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