博碩士論文 89521048 詳細資訊




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姓名 王森田(Sen-Tien Wang)  查詢紙本館藏   畢業系所 電機工程學系
論文名稱 多載波分碼多重存取系統之研究分析
(Research on Multi-Carrier CDMA System Analysis)
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摘要(中) 近來,隨著寬頻技術的發展,人們可以擁有更多的資訊服務,例如:語音、視訊、多媒體及寬頻資訊服務。然而,人們所提出的3G系統並無法真正達到2-Mbps的標準傳輸速率,事實上最高只能達到384-Kbps的速度,要達到真正寬頻的服務,整套系統必須躍升到第四代行動通訊網路才能實現。在第四代行動通訊之中,人們提出多載波調變(Multi-Carrier Modulation;MCM)技術,它的優點是在於頻率選擇性衰減(frequency selective fading)的環境中有較佳的表現。多載波分碼多重存取(Multi-Carrier Code Division Multiple Access;MC-CDMA)技術,為一種多載波調變技術,其包含分碼多重存取(Code Division Multiple Access;CDMA)及正交分頻多工(Orthogonal Frequency Division Multiplexing;OFDM)技術。
本論文在接收機部分使用最小均方誤差組合(Minimum Mean Square Error Combining;MMSEC)的檢測方法,分別在可加性的白色高斯雜訊通道(Additive White Gaussian Noise)及頻率選擇性衰減通道下分析與模擬,並針對系統參數的不同加以討論。
摘要(英) Recently, as the broadband technology increases, people can have many different kinds of broadband service. For example, voice, video, multimedia and a great quantity of data services. However, the architecture of 3G systems cannot truly provide the broadband service. Originally it maintains the possible 2-Mbps data rate in the standard, but it will realistically achieve 384-kbps rates. To achieve the goals of true broadband service, the systems have to make a leap to the fourth-generation (4G) systems.
In the 4G systems, the Multi-Carrier Modulation (MCM) technique is proposed. The MCM’s advantages include better performance in the frequency selective fading channel. MC-CDMA scheme is one of the MCM techniques that combination of CDMA and OFDM schemes.
In this thesis, the system models include the transmitter model, channel models and receiver model. The channel model is based on AWGN and frequency selective fading channel. In the receiver model, we use the Mean Square Error Combining (MMSEC) method for the detection scheme. In the numerical simulation results of the OFDM system and the MC-CDMA system include the different values of parameters in AWGN channel and frequency selective fading channel.
關鍵字(中) ★ 多載波分碼多重存取 關鍵字(英) ★ Multi-Carrier CDMA
★ MC-CDMA
論文目次 Abstract i
Contents iii
List of Figures v
List of Tables viii
Chapter 1 Introduction 1
1.1 Motivation and Objective 1
1.2 Structure of the Thesis 2
Chapter 2 Principles of Multi-Carrier Modulation 4
2.1 Orthogonal Frequency Division Multiplexing 4
2.2 Basic Principles of Direct Sequence (DS)-CDMA 9
2.3 OFDM-CDMA Schemes 14
2.3.1 Multi-Carrier DS-CDMA Scheme 14
2.3.2 MT-CDMA Scheme 17
2.3.3 MC-CDMA Scheme 19
Chapter 3 System Model 25
3.1 Transmitter Model 25
3.2 Channel Model 32
3.3 Receiver Model 37
Chapter 4 Numerical Simulations 41
4.1 Performance Evaluation for OFDM System 41
4.2 Performance Evaluation for MC-CDMA System in AWGN Channel 56
4.2.1 Comparisons of the BER for Various Modulations 56
4.2.2 Comparisons of the BER for Various Subcarriers 58
4.2.3 Comparisons of the BER for Various Users 59
4.2.4 Comparisons of the BER for Various Data Rate 60
4.3 Performance Evaluation for MC-CDMA System
in Frequency Selective Fading Channel 62
4.3.1 Comparisons of the BER for Various Modulations 63
4.3.2 Comparisons of the BER for Various Subcarriers 64
4.3.3 Comparisons of the BER for Various Users 65
4.3.4 Comparisons of the BER for Various Data Rate 66
Chapter 5 Conclusions 68
Appendix Abbreviations and Acronyms I
References II
參考文獻 [1] Hara, S.; Prasad, R., “Overview of multicarrier CDMA,” IEEE Communications Magazine, Page(s): 126 –133, Dec. 1997
[2] Prasad, R.; Hara, S., “An overview of multi-carrier CDMA,” Spread Spectrum Techniques and Applications Proceedings, IEEE 4th International Symposium on, Page(s): 107 –114, 1996
[3] Hara, S.; Prasad, R., “DS-CDMA, MC-CDMA and MT-CDMA for mobile multi-media communications,” Vehicular Technology Conference, Mobile Technology for the Human Race., IEEE 46th, Page(s): 1106 –1110, 1996
[4] Richard van Nee; Ramjee Prasad, OFDM for Wireless Multimedia Communications, Artech House, 2000
[5] Sari, H.; Karam, G.; Jeanclaude, I., “Transmission techniques for digital terrestrial TV broadcasting,” IEEE Communications Magazine, Page(s): 100 -109, Feb. 1995
[6] Andreas F. Molisch, Wideband Wireless Digital Communications, Prentice Hall, 2001
[7] Tero O.; Ramjee P., Wideband CDMA for Third Generation Mobile Communications, Artech House, 1998
[8] Harri Holma; Antti Toskala, WCDMA for UMTS, Radio Access for Third Generation Mobile communications, Wiley, 2000
[9] Natarajan, B.; Nassar, C.R.; Shattil, S.; Michelini, M.; Wu, Z., “High-performance MC-CDMA via carrier interferometry codes,” Vehicular Technology, IEEE Transactions on, Page(s): 1344 –1353, 2001
[10] Sponsor LAN/MAN Standards Committee of the IEEE Computer Society, “Part 11:Wireless LAN Medium Access Control (MAC) and Physical Layer (PHY) specifications – High-speed Physical Layer in the 5 GHz Band,” IEEE Std 802.11a, 1999
[11] Jnohg Sam Lee; Leonard E. Miller, CDMA SYSTEM ENGINEERING HANDBOOK, Artech House, 1998
[12] Bernard Sklar, Digital Communications - Fundamentals and Applications, Communication Engineering Services, Tarzana, California University of California, Los Angeles, Second Editions, 2001
[13] Byung-Chul Kim; I-Tai Lu, “Parameter study of OFDM underwater communications system,” OCEANS 2000 MTS/IEEE Conference and Exhibition, Page(s): 1251 –1255, 2000
[14] Miller, S.L.; Rainbolt, B.J., “MMSE detection of multi-carrier CDMA,” Military Communications Conference Proceedings IEEE, Page(s): 1085 -1089, 1999
[15] Chouly, A., A. Brajal and S. Jourdan, “Orthogonal Multicarrier Techniques applied to Direct Sequence Spread Spectrum,” Proc. Of IEEE GLOBECOM’93, Page(s): 1723 –1728, 1993
[16] L. Hanzo; W. Webb; T. Keller, Single- and Multi-carrier Quadrature Amplitude Modulation, Principles and Applications for Personal Communications, WLANs and Broadcasting, Wiley, 2001
指導教授 蔡木金(Mu-King Tsay) 審核日期 2002-6-18
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