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研究生:劉奕成
研究生(外文):I-CHENG Liu
論文名稱:改良式離散傅立葉通道估測技術於多種正交分頻多工通訊系統之應用
論文名稱(外文):Improved DFT-Based Channel Estimation Techniques for Various OFDM Communication Systems
指導教授:林容杉
口試委員:林容杉林嘉慶陳後守洪志偉郭耀文
口試日期:2014-07-29
學位類別:博士
校院名稱:國立暨南國際大學
系所名稱:電機工程學系
學門:工程學門
學類:電資工程學類
論文種類:學術論文
論文出版年:2014
畢業學年度:102
語文別:英文
論文頁數:81
中文關鍵詞:通道估測離散傅立葉通道估測技術顯著通道偵測演算法
外文關鍵詞:Channel Estimation (CE)discrete Fourier transform (DFT)-based CEsignificant channel tap detector (SCTD) scheme
相關次數:
  • 被引用被引用:0
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在無線通訊環境中,通道估測是非常重要的一個環節。本論文介紹了一個在
時域的最小平方估測法在時域同步正交分頻多工系統。在近期的論文中,雙偽雜
訊為訊號標頭的時域同步正交分頻多工系統被提出,用於保護通道估測所使用的
訊號。在我們提出的方法中,利用了一些自我干擾消除的演算法,有效率的也即
時的消除多重路徑干擾、訊符內干擾以及訊符間干擾。本論文也提出了改良式離
散傅立葉通道估測技術於時域同步正交分頻多工系統。這個方法利用了顯著通道
偵測演算法提升整體系統的效能。其中的關鍵點在於本演算法可以有效的估測雜
訊的能量並且可以因此選擇出顯著的通道進而得到精準的時域估測通道響應。
Channel estimation is a very important issue in mobile communication
environment. This dissertation introduces a time domain least-squares (TDLS)
channel estimation (CE) technique for time domain synchronous orthogonal
frequency division multiplexing (TDS-OFDM). The dual PN-sequence padding
(DPNP) TDS-OFDM has recently been proposed in many papers for protecting the
signals for CE. The proposed technique takes advantage of several self-interference
cancelation (SIC) methods to effectively and timely reduce multipath interference
(MPI), inter-symbol interference (ISI) and inter-block interference (IBI). This
dissertation also proposes the modified discrete Fourier transform (DFT)-based
channel estimation technique for TDS-OFDM communication systems. The proposed
technique based on the concept of significant channel tap detector (SCTD) scheme
possesses the potentials to effectively improve the system performance of
TDS-OFDM systems. The proposed estimation scheme can also roughly predict the
noise power in order to choose the significant channel taps to estimate the channel
impulse response.
Contents
1 Introduction 1
2 System Structure 6
2.1 Basic Concept of OFDM System . . . . . . . . . . . . . . . . . . . . . 6
2.2 Conventional OFDM System . . . . . . . . . . . . . . . . . . . . . . . 7
2.3 Matrix Representation of OFDM System . . . . . . . . . . . . . . . . 13
2.4 PRP-OFDM System . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
2.5 TDS-OFDM System . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
2.5.1 TDS-OFDM System Structure . . . . . . . . . . . . . . . . . . 24
2.5.2 TDS-OFDM Frame Structure . . . . . . . . . . . . . . . . . . 25
2.6 Dual PN-Sequence Padding Frame Structure . . . . . . . . . . . . . . 28
3 Conventional OFDM Channel Estimation Techniques 31
3.1 Basic Concept of Channel Estimation in OFDM System . . . . . . . . 31
3.1.1 CTPA-Based CE . . . . . . . . . . . . . . . . . . . . . . . . . 33
3.1.2 BTPA-Based CE . . . . . . . . . . . . . . . . . . . . . . . . . 35
3.1.3 TD-Redundancy-Based CE . . . . . . . . . . . . . . . . . . . . 36
3.2 Frequency-Domain Channel Estimation . . . . . . . . . . . . . . . . . 37
3.2.1 Frequency-Domain Least Squares Channel Estimation . . . . . 37
3.2.2 DFT-Based Channel Estimation . . . . . . . . . . . . . . . . . 39
3.2.3 Significant Channel Tap Detector . . . . . . . . . . . . . . . . 40
3.3 Time-Domain Channel Estimation . . . . . . . . . . . . . . . . . . . . 41
3.3.1 Time Domain Least Squares Channel Estimation . . . . . . . 41
4 Improved DFT-Based Channel Estimation Techniques in TDS OFDM
system 44
4.1 Time Domain Least Squares Channel Estimation . . . . . . . . . . . 45
4.1.1 Frequency Domain Equalizer . . . . . . . . . . . . . . . . . . . 50
4.2 Frequency Domain Least Squares Channel Estimation . . . . . . . . . 50
4.2.1 DFT-Based Channel Estimation and Significant Channel Tap
Detector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51
4.3 Proposed Channel Estimation . . . . . . . . . . . . . . . . . . . . . . 52
4.4 Symbol Recovery . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55
4.4.1 OLA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57
4.4.2 OLA with SIC . . . . . . . . . . . . . . . . . . . . . . . . . . . 57
5 Simulation Result and Discussion 59
5.1 Simulation Environment . . . . . . . . . . . . . . . . . . . . . . . . . 59
5.2 Comparative Simulations . . . . . . . . . . . . . . . . . . . . . . . . . 60
5.2.1 Optimal Estimated Noise Threshold . . . . . . . . . . . . . . . 60
5.2.2 BER Performance Results . . . . . . . . . . . . . . . . . . . . 63
6 Conclusions 70
Bibliography 72

List of Figures
2.1 The overall structure of the OFDM transmitter. . . . . . . . . . . . . 9
2.2 The influence of ISI in one OFDM symbol. . . . . . . . . . . . . . . . 10
2.3 The guard time insertion eliminates the ISI, but effect of multipath
with zero signal in guard time causes the ICI. . . . . . . . . . . . . . 11
2.4 OFDM symbol with cyclic extension. . . . . . . . . . . . . . . . . . 11
2.5 Analysis of OFDM system matrix form. . . . . . . . . . . . . . . . . 15
2.6 Analysis of OFDM system matrix form after removing cyclic prefix
step. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
2.7 The block diagram of the CP-OFDM. . . . . . . . . . . . . . . . . . . 18
2.8 The block diagram of the PRP-OFDM. . . . . . . . . . . . . . . . . . 21
2.9 Comparison of the CP-OFDM and TDS-OFDM. . . . . . . . . . . . . 23
2.10 The block diagram of the TDS-OFDM. . . . . . . . . . . . . . . . . . 25
2.11 PN-sequence generator structure of Mode 1. . . . . . . . . . . . . . . 26
2.12 Difference of CP-OFDM and TDS-OFDM systems. . . . . . . . . . . 29
2.13 Signal frame format for DPNP TDS-OFDM systems. . . . . . . . . . 29
3.1 Operational concept of the DFT-based channel estimation . . . . . . 39
3.2 Block diagram of the SCTD . . . . . . . . . . . . . . . . . . . . . . . 41
3.3 The channel estimation regions of time domain LS CE. . . . . . . . . 42
4.1 The frame structure of the TDS-OFDM. . . . . . . . . . . . . . . . . 46
4.2 The channel estimation regions of the proposed algorithm. . . . . . . 49
4.3 Proposed channel estimation for TDS-OFDM . . . . . . . . . . . . . 52
4.4 MSE of the system noise power and estimated noise power . . . . . . 55
4.5 The symbol recovery. . . . . . . . . . . . . . . . . . . . . . . . . . . . 57
5.1 Comparing MSE for different thresholds against SNR . . . . . . . . . 62
5.2 Significant path selection for channel with SNR = 5dB, = 1 under
CT8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65
5.3 Significant path selection for channel with SNR = 5dB, = 3 under
CT8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65
5.4 Significant path selection for channel with SNR = 5dB, = 5 under
CT8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 66
5.5 Significant path selection for channel with SNR = 30dB, = 1 under
CT8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 66
5.6 Significant path selection for channel with SNR = 30dB, = 3 under
CT8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67
5.7 Significant path selection for channel with SNR = 30dB, = 5 under
CT8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67
5.8 Comparing MSE performance with proposed algorithm under CT8. . 68
5.9 Comparing MSE performance with proposed algorithm under TU. . . 68
5.10 Comparing BER performance with proposed algorithm under CT8. . 69
5.11 Comparing BER performance with proposed algorithm under TU. . . 69

List of Tables
2.1 PN255 sequence generator state. . . . . . . . . . . . . . . . . . . . . . 27
2.2 System parameters of DTTB 8MHz bandwidth. . . . . . . . . . . . . 28
5.1 Delay power spectral density and  of COST 207. . . . . . . . . . . 60
5.2 System parameters of DPNP TDS-OFDM. . . . . . . . . . . . . . . . 61
5.3 Channel parameters of CT8 and TU 12-path. . . . . . . . . . . . . . 61
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