蘇炫榮臺灣大學：電信工程學研究所余仲晟Yu, Chung-ChengChung-ChengYu2007-11-272018-07-052007-11-272018-07-052006http://ntur.lib.ntu.edu.tw//handle/246246/58692為了滿足未來對通訊系統高速率與低延遲的要求，在WCDMA系統的上鏈傳輸已有新的強化技術被制定成標準，並被稱之為高速上鏈封包接取(HSUPA)。在這篇論文中，我們首先將評估HSUPA在貪婪式分配資料速率與傳輸功率之下的系統效能。 多用戶偵測可以有效地抵抗細胞內產生的干擾並提升系統容量。在有使用多用戶偵測的情況下，系統效能藉由系統層級模擬來被評估。使用進階的偵測技術對於整個系統的好處將會被清楚地呈現。 除了只有從實體層來改進系統效能之外，系統效能可以經由跨階層的排程設計來進一步的提升。我們提出了一個在考慮多用戶偵測被應用在系統時的跨階層排程方法。此法牽涉到決定一些實體層的參數，例如傳送功率、調變和編碼方式以及解調次序。將此排程方法結合動態調整調變和編碼方式的門檻值可以使系統適應通道統計的變化。模擬結果顯示了當移動速率小於每小時30公里時，此跨階層的排程方法可以使系統獲得顯著的增益。To fulfill the increasing demand of high throughput and low delay, enhancements to Wideband CDMA (WCDMA) uplink are considered for standardization and called High Speed Uplink Packet Access (HSUPA). In this thesis, the system level performance of HSUPA is evaluated with a greedy strategy for joint data rate and transmitting power assignment first. Multiuser detection (MUD) can combat intra-cell interference and increase system capacity. The system performance with MUD is also evaluated by system level simulation. The benefit to the system from the advanced detection technique is clearly shown. In addition to improving the system only from physical layer, the system performance can be further upgraded by cross-layer scheduling design. We propose a new cross-layer scheduling method which considers the case of MUD applied in the system. It relates to decide some physical layer parameters including transmitting power, modulation and coding scheme (MCS) and demodulation order. Combining it with the adaptive adjustment of MCS thresholds can let the system adapt variations of channel statistics. Simulation results show the significant gain can be obtained from the cross-layer scheduling approach at most cases when the mobile speed is under 30 km/hr.Chapter 1 Introduction 1 1.1. Evolution of Cellular Systems 1 1.2. Motivation 3 1.3. Contribution of This Thesis 4 1.4. Thesis Organization 5 Chapter 2 Preliminary 6 2.1. Wireless Channel Model 6 2.1.1 Large Scale Fading 6 2.1.2 Small Scale Fading 8 2.1.2.1. The Rayleigh Fading Model 9 2.1.2.2. The Ricien Fading Model 10 2.1.3 White Noise 12 2.2. Multiple Access Techniques 13 2.3. The Cellular Concept 16 2.4. Multiuser Detection 19 2.4.1 Basic CDMA Model 19 2.4.2 Matched Filter Receiver 20 2.4.3 Conventional Multiuser Detection 21 2.4.4 Multirate Multiuser Detector 25 Chapter 3 Joint Rate and Power Assignment over HSUPA 27 3.1. Theoretic Aspects of Centralized Resource Allocation 27 3.1.1 Feasible Power Region 28 3.1.2 Optimal Resource Allocation 29 3.2. Greedy Rate Packing with Total Received Power Constraint 32 3.3. Overview for HSUPA 36 3.3.1 UTRAN Architecture 36 3.3.2 Node-B Controlled Scheduling 37 3.3.3 Fast Hybrid ARQ 39 3.3.4 Shorter Transmission Time Interval 40 3.3.5 Spreading and Modulation 41 3.4. Scheduling Strategies for HARQ 44 3.4.1 Scheduled Retransmission 44 3.5. System Model 47 3.5.1 Multiple Access Channel 47 3.5.2 System Configuration 48 3.5.3 Channel Model 52 3.6. System Performance for Matched Filter Receiver 54 3.6.1 Numerical Results and Discussion 54 3.7. System Performance with Multiuser Detection 60 3.7.1 Numerical Results and Discussion 61 Chapter 4 Cross Layer Design between Physical and MAC Layer 64 4.1. Cross Layer Approach 64 4.2. Scheduling Design for Successive Interference Cancellation 66 4.2.1 Post-Processing Signal-to-Interference Plus Noise Ratio 66 4.2.2 Power Allocation Strategy 66 4.2.3 Joint Demodulation Order and Rate Assignment 67 4.2.4 Numerical Results and Discussion 69 4.3. Adaptive MCS Thresholds for Throughput Maximization 74 4.3.1 Numerical Results and Discussion 74 4.4. Uplink Proportional fair Scheduling 78 4.4.1 Fairness Criterion Over Wireless Networks 78 4.4.2 Proportional Fair Scheduling 78 4.4.3 Numerical Results and Discussion 79 4.5. The Proposed Rule for System Design 82 4.5.1 Numerical Results and Discussion 83 4.6. The Issue of Multicellular Case 89 Chapter 5 Conclusions and Future Works 90 5.1. Conclusions 90 5.2. Future Works 91 Bibliography 922602734 bytesapplication/pdfen-US高速上鏈封包接取多用戶偵測跨層排程設計系統模擬WCDMAHSUPAmultiuser detectionmodulation and coding schemecross-layer schedulingintra-cell interferencesystem level simulationthesishttp://ntur.lib.ntu.edu.tw/bitstream/246246/58692/1/ntu-95-R93942037-1.pdf