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標題: | 基於跨層設計觀點之HSUPA效能評估 Performance Evaluation of HSUPA from Cross-Layer Perspective |
作者: | Chung-Cheng Yu 余仲晟 |
指導教授: | 蘇炫榮 |
關鍵字: | 高速上鏈封包接取,多用戶偵測,跨層排程設計,系統模擬, WCDMA,HSUPA,multiuser detection,modulation and coding scheme,cross-layer scheduling,intra-cell interference,system level simulation, |
出版年 : | 2006 |
學位: | 碩士 |
摘要: | 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. |
URI: | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/33026 |
全文授權: | 有償授權 |
顯示於系所單位: | 電信工程學研究所 |
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