Rate-adaptive indoor infrared wireless communication systems using punctured convolutional codes and adaptive PPM

Michihito Matsuo, Tomoaki Ohtsuki, Iwao Sasase, Tomoyuki Udagawa

Research output: Contribution to journalArticle

Abstract

In this paper, we propose rate-adaptive indoor infrared wireless communication systems using punctured convolutional codes and adaptive pulse-position modulation (PPM) to achieve high bit rates under various channel conditions with reasonable transmitter power. The proposed system varies the code rate of the rate compatible punctured convolutional (RCPC) codes and the modulation order of PPM adaptively according to the channel condition. When the channel condition is good, low-order PPM and suitable code rates are selected, while high-order PPM and suitable code rates are selected when the channel condition is bad. We analyze the performance of the proposed system on hybrid line-of-sight (LOS) channels. Our results show that the proposed system can achieve high bit rates by varying the code rate of the RCPC codes and the modulation order of PPM adaptively according to the channel conditions. Moreover, our results show that the proposed system can achieve longer horizontal separation between the transmitter and the receiver than that of conventional systems with repetition codes.

Original languageEnglish
Pages (from-to)31-39
Number of pages9
JournalElectronics and Communications in Japan, Part I: Communications (English translation of Denshi Tsushin Gakkai Ronbunshi)
Volume84
Issue number8
DOIs
Publication statusPublished - 2001 Jul 7

Keywords

  • Adaptive PPM
  • Infrared wireless communication
  • Punctured convolutional codes
  • Rate-adaptive transmission

ASJC Scopus subject areas

  • Computer Networks and Communications
  • Electrical and Electronic Engineering

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