無線通訊系統之測距演算法設計

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姓名

黃筱琦(Hsiao-chi Huang) 查詢紙本館藏

畢業系所

通訊工程學系

論文名稱

無線通訊系統之測距演算法設計
(Ranging algorithm designs for wireless systems)

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摘要(中)

在無線通訊系統上由於各使用者與基地台的位置不相同，我們需得知相關的測距資訊，來達到系統的要求。本論文分成兩系統來討論，一個為雷達系統，另一個為初始測距的OFDMA系統。
調頻連續波(FMCW)雷達利用在時間上改變發射訊號的頻率，並測量接受信號與發射訊號頻率間的差值來測定目標距離與速度等資訊。本論文主要研究如何設計調頻連續波訊號波形，以有效抗干擾並能測得目標訊號的距離與速度資訊。
使用者與基地台建立通訊需要得知關於同步的參數，利用正交分多工接進系統的初始測距在基地台上可接收到關於時間與頻率的訊號，並利用此訊號搭配ESPRIT 演算法進一步求得關於測距的同步參數。本論文運用其他類似ESPRIT的演算法，並同時偵測出頻率位移和時間延遲，而目前的演算法[24]需利用不同的訊號處理再分別求出頻率位移和時間延遲。

摘要(英)

Because the position of every user is varied from the base station, we may need to know the related ranging information which may be required for the system. The thesis is divided into two parts. The first part is the algorithm designed for radar systems. The second part is the initial ranging algorithm design for OFDMA systems.
FMCW radar utilizes the technology by changing frequency in time from the transmitter. By way of the time difference and Doppler frequency between the transmitted and received signals, we can obtain the information about distance and velocity. The purpose of this part in the thesis is to design an FMCW signal which can resist to interferences while retain the capability of detecting the distance and velocity.
An initial ranging estimation scheme for OFDMA systems is proposed as users intend to establish communication link with the base station (BS) by utilizing spreading in both the time and the frequency domains. The synchronization parameters can be estimated by using the ESPRIT algorithm. We will use a similar ESPRIT algorithm to estimate timing delay and frequency offset simultaneously. In [15], the estimation of the timing delay and the frequency offset requires two sets of signals for processing separately to achieve to this task.

關鍵字(中)

★ 正交分頻多工接進
★ 測距
★ 調頻連續波雷達

關鍵字(英)

★ OFDMA
★ Ranging
★ FMCW

論文目次

Contents I
List of Tables III
List of Figures IV
Chapter 1 Introduction 1
1-1 Frequency modulation continuous wave radar 1
1-2 Initial ranging in OFDMA system 2
Chapter 2 System model for FMCW radar 5
2-1 FMCW radar signal model 5
2-2 Ambiguity function 6
2-3 Frequency-coding 7
2-3-1 Costas coded method 8
2-3-2 Phase coded method 9
Chapter 3 Problem formulation for FMCW radar 10
3-1 Design of anti-interference wave radar signal 10
3-2 Solve information parameters about ranging 12
3-3 Interference signal 14
3-3-1 Single frequency interference 14
3-3-2 Multi-frequency interference 15
3-4 Summary of anti-interference wave radar design 16
Chapter 4 Initial ranging algorithm in IEEE 802.16e OFDMA17
4-1 System model 17
4-1-1 System description 17
4-1-2 Signal model 18
4-2 ESPRIT-based algorithm 20
4-2-1 Frequency estimation 20
4-2-2 Timing estimation 22
4-3 Unitary ESPRIT 24
4-3-1 2D Unitary ESPRIT 26
4-4 OT-ESPRIT 27
4-5 Channel model 28
Chapter 5 Simulation 30
5-1 FMCW radar 30
5-1-1 Estimation of delay time and doppler frequency30
5-1-2 Add noise and interference 32
5-1-3 Coded sequence 35
5-1-4 Estimation error of delay time and doppler
frequency 38
5-2 Initial ranging in OFDMA system 39
5-2-1 Simulation parameters 39
5-2-2 ESPRIT-based 40
5-2-3 Unitary ESPRIT 41
5-2-4 OT-ESPRIT 43
Chapter 6 Conclusion 45
6-1 FMCW radar 45
6-2 Initial ranging in OFDMA system 45
Reference 46

參考文獻

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指導教授

陳永芳(Yung-fang Chen)

審核日期

2010-7-29

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