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研究生:楊家銘 
研究生(外文):Chia-Ming Yang
論文名稱:多速率分碼多工無線通訊網路之設計與性能分析
論文名稱(外文):Design and Performance Analysis for Multirate CDMA WirelessCommunication Networks
指導教授:楊谷章
指導教授(外文):Guu-Chang Yang
學位類別:碩士
校院名稱:國立中興大學
系所名稱:電機工程學系
學門:工程學門
學類:電資工程學類
論文種類:學術論文
論文出版年:2002
畢業學年度:90
語文別:英文
中文關鍵詞:多載波直接序列展頻二維正交展頻碼跳頻分碼多工多重速率無線網路
外文關鍵詞:MC-DS/CDMA2D OVSF codesFH-CDMAmultiratewireless netwirk
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隨著無線通訊技術的推陳出新,通訊產業也隨之蓬勃發展,更多的用戶數、更高的資料傳輸速率,及更多元化的多媒體服務將是未來發展的趨勢。
在本篇論文中,我們提出兩種新的方式來建構適用於多載波直接序列展頻系統的二維正交展頻碼。將展頻碼正交的特性應用在直接序列的分碼多工系統上,除了可增加頻寬使用效益外還具備抵抗使用者間干擾的特性。二維正交展頻碼除了具備完美的自相關和互相關特性外,在同一組的樹狀架構中,不同展頻因子的二維展碼間,還具備了正交的特性,因此,可提供多速率傳輸支援多媒體應用。此外,我們還提出了一種改良式的多跳多速率跳頻分碼多工系統,藉著改變在同一訊號周期內之傳送符號的個數來實現多重速率,並推導出最短的控制碼長度。最後我們還對改良後的系統做了模擬分析,有別於既有的多跳系統,提供給多速率傳輸一種新的選擇。

With the explosive growth of wireless communication technologies and the continuous increase in demand for a variety types of wireless services are fueling the demand for large increase in capacity, data rates, and multimedia services in the future wireless systems.
In this thesis, two new constructions of two-dimensional (2D) spreading codes, here designated as 2D orthogonal variable spreading factor (OVSF) codes, for multicarrier direct-sequence code-division multiple-access (MC-DS/CDMA) systems. Orthogonality of the spreading codes are employed to improve the
bandwidth efficiency and interference-rejection capability of the DS-CDMA systems. The 2D OVSF codes are constructed by generalizing one-dimensional (1D) OVSF codes and they possess ideal auto- and cross-correlation properties. Furthermore, these 2D OVSF codes preserve the orthogonality between different
spreading factors in an OVSF code tree and, hence, they can be employed to support multimedia services with a variety of data rates. In addition, amodified multirate multi-hop FH-CDMA system with extra data mapping codes has been proposed to provide multirate services by varying the number of transmitted
symbols per symbol duration. With the modified scheme can get more capacity when the number of symbols is increasing and the minimum length of extra data mapping codes is derived. The performance of the modified multirate multi-hop MFSK/FH-CDMA wireless communication system is simulated. The results show that the proposed scheme is useful for FH-CDMA wireless systems with multi-media services.

1 Introduction
2 Two-dimensional Orthogonal Spreading Codes for Multicarrier DS-CDMA Networks
3 Modified Multirate Multi-hop MFSK/FH-CDMA Wireless Systems
4 Conclusions

[1] F. Adachi, M. Sawahashi and H. Suda, “Wideband DS-CDMA for nextgeneration mobile communications systems,” IEEE Commun. Mag., vol. 36, no. 9, pp. 56-69, Sept. 1998.
[2] E. Dahlman, B. Gudmundson, M. Nilsson and J. Skold, “UMTS/IMT-2000 based on wideband CDMA,” IEEE Commun. Mag., vol. 36, no. 9, pp. 70-80, Sept. 1998.
[3] J. G. Proakis, Digital Communication, McGRAW-HILL, fouth edition, 2001.
[4] E.H. Dinan and B. Jabbari, “Spreading codes for direct sequence CDMA and wideband CDMA cellular networks,” IEEE Commun. Mag., vol. 36, no. 9, pp. 48-54, Sept. 1998.
[5] S. Kondo, and L. B. Milstein, “Performance of multicarrier DS CDMA systems,” IEEE Trans. Commun., vol. 44, no. 2, pp. 238-246, Feb. 1991.
[6] A. Chouly, A. Brajal and S. Jourdan, “Orthogonal multicarrier techniques applied to direct sequence spread spectrum CDMA systems,” Proc. of IRRR GLOBECOM ’93, Houston, USA, Nov. 1993, pp. 1723-1728.
[7] N. Yee and J.-P. Linnartz, “Controlled equalization of multi-carrier CDMA in an indoor Rician fading channel,” Proc. of IEEE VTC ’94, Jan. 1994, vol. 3, pp. 1665-1669.
[8] E. Sourour and M. Nakagawa, “Performance of orthogonal MC CDMA in a multipath fading channel,” IEEE Trans. Commun., vol. 44, no. 3, pp. 356-367, Mar. 1996.
[9] S. Hara and R. Prased, “Overview of multicarrier CDMA,” IEEE Commun. Mag., vol. 35, pp. 126-133, Dec. 1997.
[10] S. M. Tseng, and M. R. Bell, “Asynchronous multicarrier DS-CDMA using mutually orthogonal complementary sets of sequences,” IEEE Trans. Commun., vol. 48, no. 1, pp. 53-59, Jan. 2000.
[11] L. L. Yang and L. Hanzo, “Software-defined-radio-assisted adaptive broadband frequency hopping multicarrier DS-CDMA,” IEEE Commun. Mag., vol. 40, no. 3, pp. 174-183, Mar. 2002.
[12] T. Mabuchi, R. Kohno, and H. Imai, “Multihopping and decoding of errorcorrecting for MFSK/FH-SSMA Systems,” IEICE Trans. Commun., vol. E76-B, no. 8, pp. 874-884, Aug. 1993.
[13] H.-H. Chen, J.-F. Yeh and N. Suehiro, “A multicarrier CDMA architecture based on orthogonal complementary codes for new generations of wideband wireless communications,” IEEE Commun. Mag., vol. 39, no. 10, pp. 126-135, Oct. 2001.
[14] C.-C. Tseng and C.-L. Liu, “Complementary sets of sequences,” IEEE Trans. Info. Theory, vol. 18, no. 5, pp. 644-652, Sept. 1972.
[15] N. Suehiro and M. Hatori, “N-shift cross-orthogonal sequences,” IEEE Trans. Info. Theory, vol. 34, no. 1, pp. 143-146, Jan. 1998.
[16] F. Adachi, M. Sawahashi and K. Okawa, “Tree-structured generation of orthogonal spreading codes with di®erent length for forward link of DS-CDMA mobile radio,” Elect. Lett., vol. 33, no. 1, pp. 27-28, Jan. 1997.
[17] G. Einarsson, “Address assignment for a time-frequency, coded, spreadspectrum system,” Bell Syst. Tech. J., vol. 59, no. 7, pp. 1241-1255, Sep. 1980.
[18] S.B. Wicker and V.K. Bhargava, Reed-Solomon Codes and Their Applications, Piscataway, NJ: IEEE Press, 1994.
[19] A. Shaar and P. Davies, “Prime sequences: Quasi-optimal sequences for OR channel code division multiplexing,” Electron. Lett., vol. 19, no. 21, pp. 888-890, 1983.
[20] G.-C. Yang and W.C. Kwong, “Frequency-hopping codes for multimedia services in mobile telecommunications,” IEEE Trans. Veh. Tech., vol. 48, no. 6, pp. 1906-1915, Nov. 1999.
[21] G.-C. Yang, S.-Y. Lin, and W.C. Kwong, “MFSK/FH-SSMA wireless systems with double-media services over fading channels,” IEEE Trans. Veh. Tech., vol. 49, no. 3, pp. 900-910, May 2000.
[22] M. Schwartz, W.R. Bennett, and S. Stein. Communication Systems and Techniques, New York: McGraw-Hill, 1966.

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