博碩士論文 91523047 詳細資訊




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姓名 黃楨雅(Jen-Ya Huang)  查詢紙本館藏   畢業系所 通訊工程學系
論文名稱 多載波直接序列分碼多重進接系統之調適性位元、子載波、功率和展頻因子配置機制
(An Adaptive Bit, Subcarrier, Power, and Spreading Factor Allocation Algorithm for Multicarrier DS-CDMA Communication Systems on Forward Links)
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摘要(中) 在這個計畫中,我們對於以多載波直接序列分碼多重進接(MC DS-CDMA)為基礎的多個使用者下鏈傳送端通訊系統,提出一種即時的位元、子載波、功率和展頻因子的配置演算法。假設基地台已知全部使用者的所有子載波增益,提出的下載演算法(loading algorithm)為最小化所需的傳送功率,且必須滿足每位使用者所需的傳送速率和資料錯誤率的限制。在這新的演算法中,結合動態位元分配演算法(DBA)和展頻因子參數的調適,來決定位元、子載波、功率和展頻因子的配置。所提出的方法在傳送功率方面比[7]和[9]提供了更好的效能,而其也顯示在模擬結果中。
摘要(英) In this paper, we propose a real-time bit, subcarrier, power, and spreading factor allocation algorithm for MC DS-CDMA communication system in forward link transmission. Assuming that base stations know the channel gain of all subcarriers of all users, the proposed loading algorithm tries to minimize the required transmit power while satisfying the rate requirement and data error rate constraint of each other. The novel algorithm determines bit, subcarrier, power, and spreading factor allocation simultaneously by the combination of DBA algorithm and spreading factor parameter. The proposed scheme offers better performance in the terms of transmit power than [7][9], as demonstrated in the simulation results.
關鍵字(中) ★ 多載波直接序列分碼多重進接
★ 下載演算法
★ 動態位元分配演算法
關鍵字(英) ★ MC DS-CDMA
★ loading algorithm
★ DBA algorithm
論文目次 Contents I
List of Figures II
Chapter 1 Introduction 1
Chapter 2 DS-CDMA and MC DS-CDMA 4
2.1 Introduction 4
2.2 The characteristic of spread spectrum modulation 4
2.3 The structures of DS-CDMA and MC DS-CDMA 7
2.3.1 DS-CDMA Scheme 7
2.3.2 MC DS-CDMA Scheme 9
Chapter 3 System Model and Channel Model 11
3.1 Introduction 11
3.2 System Model 11
3.3 The characteristic of multipath fading channels 17
3.4 Channel Model 20
Chapter 4 Multiuser Allocation Algorithms 25
4.1 Introduction 25
4.2 Dynamic bit Assignment (DBA) 25
4.3 Dynamic Spreading Factor Assignment (DSFA) 29
4.4 Dynamic Bit and Spreading Factor Assignment (DBSFA) 31
Chapter 5 Simulation Results 33
Chapter 6 Conclusions 50
Reference 51
參考文獻 [1] R. Prasad and S. Hara, “Overview of Multicarrier CDMA,” IEEE Comm. Mag., Dec. 1997, pp. 126-133.
[2] S. K. Lai, R. S. Cheng, K. B. Letaief, and C. Y. Tsui, “Adaptive tracking of optimal bit and power allocation for OFDM systems in time-vary channels,” Proc. IEEE 49th VTC, vol.2, pp. 776-780, 1999.
[3] Y. W. Cheong, R. S. Cheng, K. B. Lataief, and R. D. Murch, “Multiuser OFDM with Adaptive Subcarrier, Bit, and Power Allocation”, IEEE J. Selected Areas Comm., vol. 17, pp. 1747-1758, October 1999.
[4] S. Song, C. Hou, and D. Cao, “Bit allocation algorithm for multi-user adaptive OFDM system with adaptive trellis coded MQAM,” IEEE CCECE 2002, vol. 3, pp. 1300-1304, 2002.
[5] J. Jang and K B. Lee, “Transmit Power Adaptation for Multiuser OFDM Systems,” IEEE J. Selected Areas Comm., vol. 21, pp. 171-178, Feb. 2003.
[6] Y. H. Kim, I. Song, S. Yoon and So Ryoung Park, “A Multicarrier CDMA system with adaptive subchannel allocation for forward links,” IEEE Trans. Vehicular Tech., vol. 48, pp. 1428-1436, Sep 1999.
[7] Y. Tamura, S. P. W. Jarot, M. Nakagawa, “ Subcarrier selection with variable spreading factor for reverse link of TDD multi-carrier/DS-CDMA system,” IEEE Mobile and Wireless Comm. Network, 2002. 4th International Workshop on, pp. 350-354 Sept. 2002.
[8] Z. Zhang, Y. Zhao and Yan ya, “Adaptive Modulation and Power Allocation for Multicarrier DS/CDMA,” IEEE Comm., Circuits and System and West Sino Exposition., vol. 1, pp. 243-246, July 2002.
[9] Y. Zhao, M. Dong and W. Wu, “An Adaptive Modulation Algorithm for Multicarrier DS/CDMA,” IEEE Vehicular Technology Conference, Vol. 4, pp. 1873-1876, May 2002.
[10] S. T. Chung, A. J. Goldsmith, “Degrees of freedom in adaptive modulation: A unified view,” IEEE Trans. On Commun. 2001,49(9):1561-1571.
[11]
M. Patzold, U. Killat, F. Laue, and Y. Li, “On the statistical properties of deterministic simulation models for mobile fading channels,” IEEE Trans. Vehicular Tech., vol. 47, pp. 254-269, Feb. 1998.
[12] Theodore S. Rappaport, Wireless Communications, Prentice-Hall, Inc 1996.
[13] 陳政緯,“適用於多重使用者,正交分頻多工系統之子載波,位元和功率配置機制”,國立中央大學電機工程研究所,碩士論文,2003.
指導教授 陳永芳(Yung-Fang Chen) 審核日期 2004-7-6
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