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    Title: System design and performance evaluation for broadband wireless communication system
    Other Titles: 寬頻無線通訊系統之系統設計與效能評估
    Authors: 林政曜;Lin, Jheng-Yao
    Contributors: 淡江大學電機工程學系博士班
    詹益光;Jan, Yih-Guang
    Keywords: 全球互通微波存取;電機電子工程師學會 802.16m;分時多工;分頻多工;最小方差;最小均方誤差;多輸入多輸出;正交分頻多工;雷利通道;協調技術;WiMAX (Worldwide Interoperability for Microwave Access);IEEE 802.16m;LTE (Long Term Evolution);TDD (Time-Division Duplex);FDD (Frequency-Division Duplex);LS (Least Square);MMSE (Minimum Mean Square Error);MIMO (Multiple-Input Multiple-Output);OFDM (Orthogonal Frequency-Division Multiplexing);Rayleigh channel;Coordination
    Date: 2012
    Issue Date: 2012-06-21 06:48:26 (UTC+8)
    Abstract: 本論文共分為三個部分來討論寬頻無線通訊系統之系統設計與效能評估,第一個部分我們討論干擾的來源以及其干擾對系統效能的影響。在IEEE802.16m上行/下行控制通道中我們提出了領航訊號型式,如正方型領航訊號、直線型領航訊號;接著在通道路徑上,考慮一個行動台與多個基地台之間的干擾狀況,其中行動台對應於一個服務基地台,其他基地台對於行動台將會產生不同的干擾狀況,因此我們設計不同干擾權重的領航訊號給其他干擾的基地台使用,最後模擬得知設計後的干擾影響將低於一般無使用此設計的情況。第二個部分提出在IEEE 802.16m Resource Block裡放置領航訊號於不同位置時,同時去估測這些領航訊號的通道頻率響應,並使用這些領航訊號估測出來的通道頻率響應經由線性內插法去估測出Resource Block中其他位置的通道頻率響應。在通道頻率響應的估測中,我們使用了最小平方差以及最小均方差兩種演算法,並提出一個2x2 MIMO OFDM的系統架構模擬速度3km/hr、120km/hr、350km/hr下的位元錯誤率以及分析系統效能。第三個部分在新世代無線通訊系統有著高傳輸速度與高頻寬等優點下,針對基地台在其涵蓋範圍內,如何建立基地台之間的協調合作機制以提高頻寬使用效率;同時也探討當基地台在其涵蓋範圍內存在Femto cells或是Repeaters時,整體的系統架構,通道模型,信號的傳送及接收,Repeater的基本特性等。最後利用模擬方法以比較系統有無存在Femto cells或是Repeaters時其系統通信量及頻寬的使用情況比較。
    In this dissertation it consists of three parts to discuss System design and performance evaluation for broadband wireless communication system.
    In the first part we discuss the sources of interferences and their effect on the system performance in the transmission of pilot signals in the uplink and downlink (UL/DL) control channels. Square and line type pilot patterns are considered. Then in communication paths between an MS and various BSs, including a desired path between the MS and the desired BS and many interference paths between the MS and other BSs, then when we assign different weight to each interference pilot type the resulting system interference will be lower than the interference induced in the system in which a common and equal weight is assigned to all pilots.
    In the second part of this dissertation it involves the estimation of channel impulse response; we first insert various types of pilots at pre-determined locations of the physical Resource Block in IEEE 802.16m to estimate the channel impulse responses at these locations and then use certain linear interpolation techniques to find the channel impulse responses at other locations. In the channel impulse response estimation both the Least Square (LS) and the Minimum Mean Square Error (MMSE) algorithms are considered. Various pilot structures have been proposed for 2x2 MIMO OFDM systems and the system performances in terms of bit error rate (BER) have been simulated and evaluated from the estimated channel impulse responses when an mobile user moves at speeds of 3 km/hr, 120 km/hr and 350 km/hr.
    In the last part of this dissertation we consider in the next generation wireless communication system in the implementation of coordination scheme among base stations to improve the system bandwidth utilization efficiency; simultaneously we also consider the situation when it includes Femto cells or Repeaters in the base station coverage areas. We discuss the basic characteristics of Femto cells and Repeaters; explore the possible overall system structures and the possible channel models. With simulation evaluations we find the system capacity, bandwidth utilization when Femto cells are deployed or Repaeters are installed and compare these system performances with those systems without Femto cells or Repeaters included.
    Appears in Collections:[電機工程學系暨研究所] 學位論文

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