Equalization for infrared wireless systems using OOK-CDMA

Hiroe Yamaguchi, Ryoko Matsuo, Tomoaki Ohtsuki, Iwao Sasase

Research output: Contribution to journalArticlepeer-review

6 Citations (Scopus)


In this paper, we propose an equalizer for indoor infrared wireless systems using on-off keying code-division multiple-access (OOK-CDMA). The proposed equalizer has a decision-feedforward filter to mitigate the effects of inter symbol interference (ISI) at the previous chip position of the sampling instant. We evaluate the performance of indoor infrared wireless systems using OOK-CDMA with three kinds of equalizers: the decision-feedback equalizer (DFE), the feedforward equalizer (FE), and the proposed equalizer. To estimate the impulse response, we use the training sequence that alternates '1' and '0' sequentially. Among three kinds of equalizers, we show that the system with the proposed equalizer can achieve the best bit error rate (BER) performance at high bit rate, while the system with the FE achieves the best BER performance when the bit rate is low.

Original languageEnglish
Pages (from-to)2292-2299
Number of pages8
JournalIEICE Transactions on Communications
Issue number10
Publication statusPublished - 2002 Oct


  • Equalizer
  • Indoor infrared wireless system

ASJC Scopus subject areas

  • Software
  • Computer Networks and Communications
  • Electrical and Electronic Engineering


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