Performance of indoor infrared wireless CDMA systems with angle diversity

Edward Mutafungwa*, Yong Liang

*Corresponding author for this work

    Research output: Contribution to journalArticleScientificpeer-review

    Abstract

    Indoor infrared communication systems is one of the possible ways of offering data rates in excess of 100 Mbit/a without the need for wiring. Multiple users can share an infrared channel by code division-multiple access (CDMA) techniques. However, the CDMA system, performance is limited by both background noise and co-channel interference. In this paper we study the use of angle diversity for mitigating the effects of the noise and interference. The system considered uses on-off shift keying modulation with multibeam transmitters and imaging receivers. The overall system performance for different diversity combining techniques is evaluated and compared to a system without diversity. Numerical results for a 2-user CDMA system indicate that signal to noise and interference ratio (SNIR) improvement (over systems with no diversity) of 5 dB is obtained for at least 50% of an ensemble of 10000 sample evaluations. The generalized selection combining (GSC) - a new diversity technique yet to be implemented for infrared systems - offers the best performance even with its reduced complexity.

    Original languageEnglish
    Pages (from-to)365-381
    Number of pages17
    JournalInternational journal of infrared and millimeter waves
    Volume25
    Issue number2
    DOIs
    Publication statusPublished - Feb 2004
    MoE publication typeA1 Journal article-refereed

    Keywords

    • Diversity
    • Infrared communication
    • Optical code-division multiplexing
    • Optical wireless

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