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  1. 020 学位論文
  2. 複合科学研究科
  3. 17 情報学専攻

Research on Sequence Design for 4thGeneration Mobile Communications

https://ir.soken.ac.jp/records/847
https://ir.soken.ac.jp/records/847
1edd0c8a-2ec9-43e5-85b6-e6a720ba5ac1
名前 / ファイル ライセンス アクション
甲951_要旨.pdf 要旨・審査要旨 (277.2 kB)
Item type 学位論文 / Thesis or Dissertation(1)
公開日 2010-02-22
タイトル
タイトル Research on Sequence Design for 4thGeneration Mobile Communications
タイトル
タイトル Research on Sequence Design for 5thGeneration Mobile Communications
言語 en
言語
言語 eng
キーワード
主題Scheme Other
主題 ZCZ, T-ZCZ, complementary sequence, CDMA, MC-CDMA
資源タイプ
資源タイプ識別子 http://purl.org/coar/resource_type/c_46ec
資源タイプ thesis
著者名 張, 超

× 張, 超

張, 超

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フリガナ チョウ, チョウ

× チョウ, チョウ

チョウ, チョウ

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著者 ZHANG, Chao

× ZHANG, Chao

en ZHANG, Chao

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学位授与機関
学位授与機関名 総合研究大学院大学
学位名
学位名 博士(情報学)
学位記番号
内容記述タイプ Other
内容記述 総研大甲第951号
研究科
値 複合科学研究科
専攻
値 17 情報学専攻
学位授与年月日
学位授与年月日 2006-03-24
学位授与年度
値 2005
要旨
内容記述タイプ Other
内容記述 Nowadays, 4th generation (4G) mobile communications have been received much more attention due to the up-going requirement for large system capacity, high transmission rate and ubiquitous services etc. Besides Orthogonal Frequency Division Multiplex (OFDM) and Multi-In Multi-Out (MIMO) technologies, CDMA technology is also expected to be facilitated with 4G characteristics, which leads to the crucial task of the sequence design for CDMA system. Up to date, sequences with Zero Correlation Zone (ZCZ) have been successfully applied in many communication systems, especially in SCDMA(Synchronized CDMA) and QS-CDMA (Quasi-Synchronized CDMA).With the zero correlation zones in the correlation functions, the systems enjoy low interference.<br /> Moreover, the set of complementary sequences which has ideal correlation functions of sequence groups can be considered as the special form of ZCZ sequence set employed in the single carrier CDMA systems as well as Multi-Carrier (MC) CDMA systems. Recently, with the success of LAS-CDMA, the ZCZ sequences and ZCZ sequence sets become more and more celebrated. This thesis is devoted to carry out the research of novel ZCZ sequences and ZCZ sequence sets.<br /> The first contribution presented in this thesis is sequence set with Three Zero Correlation Zones (T-ZCZ), which is intended to handle the restrictions of the number of complementary sequences in MC-CDMA system. Specifically, the algorithms for generating T-ZCZ sequences are discussed. The theoretical bound of T-ZCZ sequence set is calculated. Some applications of T-ZCZ sequence set are also presented. Meanwhile, the performance in the CDMA system is evaluated. The result shows that the T-ZCZ sequences have the same performance as the complementary sequences in interference cancellation, while the number of the T-ZCZ sequences is considerably larger. That means the system capacity can be drastically increased by T-ZCZ sequences.<br /> Another contribution in MC-CDMA system is “Two-Dimensional Combined Complementary Sequence (TDC)”, whose row and column vectors are both complementary sequences. This kind of structure achieves PAPR (Peak-to-Average Power Ratio) reduction as well as interference cancellation. In the thesis, the algorithm to generate TDC sequences and the detailed structure of the corresponding MC-CDMA system are stud-ied. The BER (Bit Error Rate) performance of the uplink and downlink is also analyzed and evaluated.<br /> Due to the importance of the complementary sequences, the research on the pertinent generating algorithm is launched. Comparing with the previous algorithm which can generate the set of complete complementary sequences of length N<SUP>n</SUP>N(n;N∈Z<SUP>+</SUP>),we present an algorithm which can produce the set of complete complementary sequences with shorter length 2<SUP>m</SUP>N(m;N∈Z<SUP>+</SUP>). The sequence set with short length can be applied in some special cases that long sequence is not appreciated, such as infrared communications.<br /> Additionally, we give an algorithm for the generalized LS sequences derived from the set of complete complementary sequences. Compared with LS sequences , which derived from Golay complementary pairs, the new generalized LS sequences enjoy more categories and sequences. The LS sequences can be classified as the special form of the generalized LS sequences.<br /> At last, the application of ZCZ sequences in Wireless Local Area Network (WLAN )is discussed. In WLAN, we use CCK modulation enhanced by pseudo-periodic sequences instead of the common traditional CCK modulation. The enhanced CCK with ZCZs shows good performance against multi-path interference. <br /> In summary, throughout this thesis, novel sequences are designed for the incoming4th generation mobile communications, especially for the enhanced CDMA system capable of efficient interference cancellation. <br /> <br />  KeyWords: ZCZ, T-ZCZ, complementary sequence, CDMA, MC-CDMA
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