A Study of Transmitted Pulse Waveforms on Indoor Infrared Wireless Communications via Diffuse Links

Akihiro Sato, Tomoaki Ohtsuki, Hideyuki Uehara, Iwao Sasase

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

The main problem of an indoor infrared (IR) wireless system via diffuse infrared link is bit error rate (BER) performance degradation due to intersymbol interference (ISI) induced by multipath distortion. In the previous study, only a rectangular pulse was employed as a transmitted pulse. However, multipath distortion tends to make the nondirected diffuse indoor IR channel have a low-pass frequency characteristic, and thus a rectangular pulse, whose spectrum has a form of sine function, induces much ISI. In this paper, we analyze the BER performance of indoor IR wireless system via diffuse link employing different kinds of pulse waveforms, such as a Gaussian pulse and a raised cosine pulse, and consider the effect of ISI. Moreover, we analyze the BER performance employing a return-to-zero (RZ) pulse which has a guard interval in a slot. It is shown that the RZ Gaussian pulse is effective in mitigating the effect of ISI.

Original languageEnglish
Pages (from-to)33-43
Number of pages11
JournalElectronics and Communications in Japan, Part I: Communications (English translation of Denshi Tsushin Gakkai Ronbunshi)
Volume83
Issue number9
DOIs
Publication statusPublished - 2000 Jan 1

Keywords

  • Diffuse infrared channel
  • Gaussian pulse
  • Guard interval
  • Intersymbol interference
  • Multipath distortion

ASJC Scopus subject areas

  • Computer Networks and Communications
  • Electrical and Electronic Engineering

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