System stability of SS-CDMA location and short message communication using QZSS

Akinori Taira, Yuji Miyake, Suguru Kameda, Noriharu Suematsu, Tadashi Takagi, Kazuo Tsubouchi

Research output: Chapter in Book/Report/Conference proceedingConference contribution

8 Citations (Scopus)

Abstract

Highly-dependable wireless communication using satellites has been getting much attention for emergency use. In order to achieve direct access between numerous personal terminals and satellite, we have proposed spread spectrum code division multiple access (SS-CDMA) communication system. It adopts long spreading code and high accuracy positioning signal from Quasi-Zenith Satellite System (QZSS). SS-CDMA has to provide the high reliable short message communication to several million terminals in limited time with limited frequency band. Thus high multiplexing rate CDMA in uplink is employed. Keeping orthogonality among all terminals using the QZSS positioning service is a fundamental requisite. However, terrestrial terminals do not always keep the suitable situation for positioning. In this paper, system stability is evaluated in the case of the part of terminals loses the orthogonality in time and frequency domain. We show transmit performance degradation in such case and reveal that the system stability can be kept.

Original languageEnglish
Title of host publication2014 Asia-Pacific Microwave Conference Proceedings, APMC 2014
PublisherInstitute of Electrical and Electronics Engineers Inc.
Pages947-949
Number of pages3
ISBN (Electronic)9784902339314
Publication statusPublished - 2014 Mar 25
Event2014 Asia-Pacific Microwave Conference, APMC 2014 - Sendai, Japan
Duration: 2014 Nov 42014 Nov 7

Publication series

Name2014 Asia-Pacific Microwave Conference Proceedings, APMC 2014

Other

Other2014 Asia-Pacific Microwave Conference, APMC 2014
CountryJapan
CitySendai
Period14/11/414/11/7

Keywords

  • Code division multiple access (CDMA)
  • Quasi-zenith satellite system (QZSS)
  • Satellite communication
  • Spread spectrum
  • System stability

ASJC Scopus subject areas

  • Computer Networks and Communications
  • Hardware and Architecture
  • Electrical and Electronic Engineering

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