馮世邁臺灣大學：電信工程學研究所Chen, Hou-ShinHou-ShinChen2007-11-272018-07-052007-11-272018-07-052004http://ntur.lib.ntu.edu.tw//handle/246246/58639In this thesis, complete receiver algorithms including mode detection, synchronization, and channel estimation are proposed for DVB-T OFDM systems. Based on a quasi-synchronous multi-user OFDM model, a multi-user timing synchronization algorithm, multi-user frequency offset algorithm, and multi-user sampling clock offset algorithm are also proposed using the specially constructed pilot preambles. Simulation results show that the proposed algorithms in this thesis have very good performance.CONTENTS ACKNOWLEDGEMENT Ⅰ ABSTRACT Ⅱ CONTENTS Ⅲ CHAPTER 1. INTRODUCTION 1 CHAPTER 2. RECEIVER DESIGN FOR DVB-T OFDM 3 2.1 SYSTEM SPECIFICATIONS 6 2.2 PROPOSEDRECEIVER 8 2.3 BLIND MODE DETECTION 8 2.3.1 PROPOSED ALGORITHM 9 2.3.1.1 DETECTION OF THE NUMBER OF SUBCARRIERS 9 2.3.1.2 DETECTION OF THE CP LENGTH 10 2.3.2 PERFORMANCE EVALUATION 11 2.4 SYNCHRONIZATION 16 2.4.1 TIMING SYNCHRONIZATION AND FREAUENCY OFFSET ESTIMATION 16 2.4.2 SAMPLING CLOCK OFFSET ESTIMATION 22 2.4.2.1 CHANNEL DELAY ESTIMATION 22 2.4.2.2 PROPOSED SAMPLING CLOCK OFFSET ESTIMATION 25 2.4.2.3 SIMULATION RESULTS 27 2.5 CHANNEL ESTIMATION 34 2.5.1 1D INTERPOLATION 35 2.5.2 2D INTERPOLATION 37 2.5.3 SIMULATION RESULTS 37 2.6 OVERALL PERFORMANCE OF THE PROPOSED RECEIVER 39 CHAPTER 3. MULTI-USER TIMING SYNCHRONIZATION 41 3.1 SYSTEM MODEL 41 3.2 MODULATABLE SEQUENCE 43 3.3 TIMING SYNCHRONIZATION 44 3.3.1 AWGN CHANNEL WITHOUT FREQUENCY OFFSET 44 3.3.2 AWGN CHANNEL WITH FREQUENCY OFFSET 46 3.3.3 MULTI-PATH PROPAGATION CHANNEL WITH FREQUENCY OFFSET 47 3.4 SIMULATION RESULTS 51 CHAPTER 4. MULTI-USER FREQUENCY OFFSET ESTIMATION 57 4.1 BASIC CONCEPTS 58 4.2 MULTI-USER FREQUENCY OFFSET ESTIMATION 59 4.3 PERFORMANCE ENHANCEMENT ALGORITHM 61 4.4 SIMULATION RESULTS 62 CHAPTER 5. MULTI-USER SAMPLING CLOCK OFFSET ESTIMATION 65 5.1 SAMPLING CLOCK OFFSET ESTIMATION FOR SINGLE USER SYSTEM 66 5.1.1 BASIC CONCEPTS 66 5.1.2 CHANNEL DELAY ESTIMATION FOR OFDM 67 5.1.3 SAMPLING CLOCK OFFSET ESTIMATION FOR OFDM 69 5.2 SAMPLING CLOCK OFFSET ESTIMATION FOR MULTI-USER SYSTEMS 70 5.2.1 RECEIVED MULTI-USER SIGNALS 70 5.2.2 PILOT ALLOCATION 73 5.2.3 PROPOSEDFREQUENCY DOMAIN FREQUENCY OFFSET COMPENSATION ALGORITHM 74 5.2.4 SAMPLING CLOCK OFFSET ESTIMATION 76 5.3 SIMULATION RESULTS 76 CHAPTER 6. CONCLUSION 81 REFERENCES 84818872 bytesapplication/pdfen-US同步估測synchronizationOFDMthesishttp://ntur.lib.ntu.edu.tw/bitstream/246246/58639/1/ntu-93-R91942025-1.pdf