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    Please use this identifier to cite or link to this item: http://ccur.lib.ccu.edu.tw/handle/A095B0000Q/773


    Title: 高準度LTE上鏈系統之時序估測;High-Accuracy Timing Estimation for LTE Uplink System
    Authors: 陳政諺;CHEN, JHENG-YAN
    Contributors: 通訊工程研究所
    Keywords: LTE;隨機接入;誤偵測;錯失偵測;前導碼檢測;時序估測;LTE;random access;false alarm;miss detection;preamble detection;timing estimation
    Date: 2017
    Issue Date: 2019-07-17 10:47:46 (UTC+8)
    Publisher: 通訊工程研究所
    Abstract: 本論文研究在LTE(long term evolution)架構下,提供兩步驟上鏈(uplink)時序估測系統的設計,在基地台(eNB)接收使用者傳送的隨機接入前導碼(preamble)進行檢測,能夠在基地台端提供更精準時序估測讓使用者與進行上鏈時序校正,達到上行同步的目的。論文中提出兩步驟的隨機接入時序估測方法,第一步驟,前導碼檢測透過補零(zero padding)增加額外的時序估測解析度後,在ZC序列因為補零所造成自相關特性被破壞的情況下,設計訊號檢測的方法,第二步驟,同上述情況下,設計峰值檢測的方法,利用訊號在功率延遲分布(power delay profile, PDP)上的功率分布狀況以峰值間的功率差以及時間差設計門檻值,藉此檢測出使用者的最早到達路徑延遲,作為估算時序提前(timing advance, TA)的依據,供使用者作時序校準之用。模擬結果顯示透過選擇適當的功率差門檻值及時間差門檻值,能夠在ZC序列自相關特性被破壞的情況下進行前導碼檢測,相較於使用原始ZC序列長度839的前導碼檢測方法,有效改善隨機接入的時序估測誤差。
    This paper studies the design of a two-step uplink timing estimation system under the LTE (long term evolution) architecture. The base station detect the random access preamble transmit from the user. The base station can provide more accurate timing estimates for the user to make timing correction to achieve the purpose of uplink syn-chronization. In this paper, a two-step random access timing estimation method is proposed. In the first step, the preamble detection adds additional timing estimation resolution through zero padding, but the autocorrelation characteristic is also de-stroyed by zero-padding. In this case the signal detection method is designed. The second step, the same as above, the method of timing estimation is designed to per-form peak detection by calculating the power delay profile, using the power differ-ence and the time difference between the peak design threshold as the basis for judg-ing the path, The aim is to find the earliest arriving path as timing advance(TA), pro-vide the user to complete the uplink timing correction.The simulation results show that the preamble detection can be carried out when the ZC sequence autocorrelation is destroyed, and the timing estimation error of ran-dom access can be improved by selecting the appropriate threshold value of power difference and time difference.
    Appears in Collections:[通訊工程研究所] 學位論文

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