Presentation 2018-02-22
A Simplified Initial Acquisition Scheme for WHCDM Based on Distribution Asymmetry of Demultiplexed Signal Energy
Yuki Nagashima, Toshiharu Kojima,
PDF Download Page PDF download Page Link
Abstract(in Japanese) (See Japanese page)
Abstract(in English) In helicopter satellite communications, the periodic channel blockage due to rotor blades is the most important problem to be solved.Code division multiplexing (CDM) employing Walsh-Hadamard code (WHCDM) is suitable for overcoming the periodic blockage.For the symbol synchronization in WHCDM systems, an initial acquisition scheme using the energy variance of the demultiplexed signal was proposed.However, the signal processing of this conventional scheme is rather complex.In this report, we propose an initial acquisition scheme in order to simplify the signal processing.The proposed scheme acquires the symbol timing using the asymmetry in the energy distribution of the demultiplexed signal.It requires significantly fewer multiplications than the conventional scheme.Results of computer simulation show that the acquisition performance of the proposed scheme is the same or slightly better than that of the conventional one. It is therefore concluded that the proposed scheme drastically reduces the complexity without performance degradation.
Keyword(in Japanese) (See Japanese page)
Keyword(in English) Helicopter Satellite Communications / Initial Acquisition / CDM / Walsh-Hadamard Code
Paper # SAT2017-59
Date of Issue 2018-02-15 (SAT)

Conference Information
Committee SAT / SANE
Conference Date 2018/2/22(2days)
Place (in Japanese) (See Japanese page)
Place (in English) The Yamaguchi Chamber of Commerce and Industry
Topics (in Japanese) (See Japanese page)
Topics (in English) Satellite Application and General
Chair Toshinori Susuki(Tohoku Gakuin Univ.) / Sonosuke Fukushima(ENRI)
Vice Chair Hiroyuki Tsuji(NICT) / Fumihiro Yamashita(NTT) / Toshifumi Moriyama(Nagasaki Univ.) / Akitsugu Nadai(NICT)
Secretary Hiroyuki Tsuji(KDDI Research Inc.) / Fumihiro Yamashita(NICT) / Toshifumi Moriyama(Mitsubishi Electric) / Akitsugu Nadai(ENRI)
Assistant / Manabu Akita(Univ. of Electro-Comm.) / Ryo Natsuaki(Univ. of Tokyo)

Paper Information
Registration To Technical Committee on Satellite Telecommunications / Technical Committee on Space, Aeronautical and Navigational Electronics
Language JPN
Title (in Japanese) (See Japanese page)
Sub Title (in Japanese) (See Japanese page)
Title (in English) A Simplified Initial Acquisition Scheme for WHCDM Based on Distribution Asymmetry of Demultiplexed Signal Energy
Sub Title (in English)
Keyword(1) Helicopter Satellite Communications
Keyword(2) Initial Acquisition
Keyword(3) CDM
Keyword(4) Walsh-Hadamard Code
1st Author's Name Yuki Nagashima
1st Author's Affiliation The University of Electro-Communications(UEC)
2nd Author's Name Toshiharu Kojima
2nd Author's Affiliation The University of Electro-Communications(UEC)
Date 2018-02-22
Paper # SAT2017-59
Volume (vol) vol.117
Number (no) SAT-446
Page pp.pp.19-24(SAT),
#Pages 6
Date of Issue 2018-02-15 (SAT)