| 摘要 | 第1-4页 |
| ABSTRACT | 第4-11页 |
| Chapter 1. Introduction | 第11-18页 |
| ·Cooperative Transmissions | 第11-14页 |
| ·Coding Strategy among Relays in Cooperative Transmissions | 第11-12页 |
| ·Forwarding Strategy of Relays in Cooperative Transmissions | 第12-13页 |
| ·OFDM based Cooperative Transmissions | 第13-14页 |
| ·Cooperative Transmissions in Sensor Networks | 第14页 |
| ·Interested System Structure | 第14页 |
| ·Synchronization in OFDM based Cooperative Transmission | 第14-15页 |
| ·Organization of the Dissertation | 第15-18页 |
| Chapter 2. Impact of Multiple Offsets in OFDM based Cooperative Transmissions | 第18-28页 |
| ·Generalized Channel for Cooperative Transmissions of Baseband Digital Signals | 第18-19页 |
| ·Impact of Timing Offset | 第19-21页 |
| ·Impact of Carrier Frequency Offset | 第21-24页 |
| ·Impact of Single CFO in Conventional OFDM Systems | 第21-24页 |
| ·Impact of Multiple CFOs in OFDM-based Cooperative Transmissi | 第24页 |
| ·Impact of Sampling Frequency Offset | 第24-27页 |
| ·Impact of Single SFO in Conventional OFDM Systems | 第24-26页 |
| ·Impact of Multiple SFOs in OFDM-based Cooperative Transmissi | 第26-27页 |
| ·Summary of the General Channel for Cooperative Transmissions | 第27-28页 |
| Chapter 3. Pre-Synchronization for Transmit Time and Carrier Frequency in Multi-hop Cooperative Transmissions | 第28-59页 |
| ·Problems and Our Goal | 第28-30页 |
| ·Generic System Model. | 第30-33页 |
| ·Network Structure | 第30-32页 |
| ·Definition of some Statistic Parameters | 第32页 |
| ·Receive SNR | 第32-33页 |
| ·General Synchronization Scheme and Error Model | 第33-37页 |
| ·Pre-Synchronization of Time Offsets and CFOs | 第33-34页 |
| ·Error Model | 第34-35页 |
| ·Determination of the Combination Coefficients. | 第35-36页 |
| ·Modeling of Local Errors | 第36-37页 |
| ·Analysis of the Synchronization Scheme | 第37-44页 |
| ·Zero Mean and Asymptotic Normal Distribution | 第37页 |
| ·Variance σj2 | 第37-39页 |
| ·Covariance γj | 第39-40页 |
| ·Exact Expression of σj2andγj | 第40-41页 |
| ·Convergence of σSj2 | 第41页 |
| ·Variance of the Sample Variance | 第41-42页 |
| ·Number of Hops | 第42-44页 |
| ·A Special Case Study | 第44-45页 |
| ·Variance, Covariance, Expected Sample Variance and Variance of Sample Variance | 第44-45页 |
| ·Parameter Design to Meet the System Tolerance | 第45页 |
| ·About Equal Gain Combination | 第45页 |
| ·Simulation for CFO pre-synchronization | 第45-56页 |
| ·Simulation for Symmetrical Networks | 第45-50页 |
| ·Simulations for Non-Symmetric Networks | 第50-56页 |
| ·Experiments for Timing Pre-Synchronization | 第56-58页 |
| ·Summary | 第58-59页 |
| Chapter 4. CFO Pre-Synchronization for STBC-OFDM based CooperativeTransmissions | 第59-71页 |
| ·Problem and the Research Goal | 第59页 |
| ·Basic Ideas | 第59-60页 |
| ·System Model | 第60-61页 |
| ·CFO Pre-Synchronization in the First Cluster | 第61-63页 |
| ·Coarse CFO Estimation Based on Single Preamble | 第61-62页 |
| ·Residual CFO Estimation Based on Pilot Vector | 第62-63页 |
| ·CFO Pre-Synchronization in the Other Clusters | 第63-66页 |
| ·Coarse CFO Estimation based on Orthogonal Preambles | 第63-64页 |
| ·Residual CFO Estimation Based on Multiple Pilot Vectors | 第64-66页 |
| ·Error Model and Statistical Results | 第66-67页 |
| ·Simulations | 第67-69页 |
| ·Residual CFOs Estimation under Frequency Selective Channels | 第69-70页 |
| ·Summary | 第70-71页 |
| Chapter 5. Self-Cancellation of Sampling Frequency Offsets in STBC-OFDM based Cooperative Transmissions | 第71-90页 |
| ·Problem and the Research Goal | 第71页 |
| ·SFO Self-Cancellation for Conventional OFDM Systems | 第71-77页 |
| ·Signal Model | 第73页 |
| ·The Idea of SFO Self-Cancellation Scheme | 第73-74页 |
| ·Analysis of the SFO Self-Cancellation Scheme | 第74-76页 |
| ·System Structure | 第76-77页 |
| ·SFOs Self-Cancellation Scheme for 2-branch STBC-OFDM based Cooperative Transmissions | 第77-82页 |
| ·Alamouti Coded OFDM based Cooperative Transmission | 第77页 |
| ·Effect of Residual CFOs and SFOs in Alamouti Coded Signals | 第77-79页 |
| ·SFOs Self-Cancellation | 第79-81页 |
| ·Analysis of Diversity Gain and Array Gain | 第81-82页 |
| ·Discussion about the Mean SFO Estimation | 第82页 |
| ·Simulations | 第82-89页 |
| ·Residual Phase Shifts | 第83-84页 |
| ·Amplitude Gain | 第84页 |
| ·SIR | 第84-86页 |
| ·Effect to the Constellations | 第86-87页 |
| ·BER Performance | 第87-89页 |
| ·Summary | 第89-90页 |
| Chapter 6. Summary and Extended Discussion of the Synchronization Algorithms for Cooperative Transmissions | 第90-94页 |
| ·Conclusion remarks of the research on the synchronization algorithms for cooperative transmissions | 第90页 |
| ·Extended Discussions | 第90-92页 |
| ·Advice to Future Research Topics | 第92-94页 |
| Chapter 7. Introduction of GNU Radio + USRP Platform | 第94-108页 |
| ·Software Defined Radios (SDRs) | 第94-98页 |
| ·The Idea of SDRs | 第94-95页 |
| ·The Advantages of SDRs | 第95-96页 |
| ·The Challenges of SDRs | 第96页 |
| ·Researches and Applications of SDRs | 第96-97页 |
| ·The Architecture of SDRs | 第97-98页 |
| ·Structure of GNU Radio + USRP Platform | 第98页 |
| ·GNU Radio | 第98-101页 |
| ·Signal Modules | 第99-100页 |
| ·Communication between Blocks and Levels. | 第100-101页 |
| ·The USRP | 第101-106页 |
| ·USB Interface | 第101-102页 |
| ·FPGA | 第102-104页 |
| ·ADCs/DACs | 第104-105页 |
| ·Daughter boards | 第105-106页 |
| ·Parameter Setting | 第106页 |
| ·An Introduction of USRP2 | 第106-107页 |
| ·Applications based on GNU Radio + USRP platform | 第107页 |
| ·Summary | 第107-108页 |
| Chapter 8. Implementation of a STBC-OFDM based Cooperative Transmission System on GNU Radio + USRP Platform | 第108-132页 |
| ·An overview of the implementation of the whole system | 第108-110页 |
| ·Implementation and Tests of the system | 第110-129页 |
| ·Implementation of the Basic Source | 第110-112页 |
| ·Implementation of the Basic Destination | 第112-116页 |
| ·Test of Basic SISO Link | 第116-121页 |
| ·Implementation of the Basic Relay | 第121-122页 |
| ·Test of Basic Two-Hop One-Relay | 第122-123页 |
| ·Implementation of CFO Pre-Synchronization | 第123-124页 |
| ·Test of CFO Pre-Synchronization | 第124-125页 |
| ·Implementation of Timing Pre-Synchronization | 第125-127页 |
| ·Test of Timing Pre-Synchronization for Two-Hop Two-Relay Case .. | 第127页 |
| ·Implementation of STBC-OFDM | 第127-129页 |
| ·Test of STBC-OFDM encoder/decoder | 第129页 |
| ·Test of Two-Relays Two-Hop Cooperative Transmission | 第129页 |
| ·Initial Problem Diagnosis and Possible Solution | 第129-131页 |
| ·Summary | 第131-132页 |
| Appendix | 第132-140页 |
| Ⅰ. Variance of the Basic CFO Estimator | 第132-134页 |
| Ⅱ. Solution to the First-Order Dynamic System in Chapter 3 | 第134-135页 |
| Ⅲ. Derivation of the Variance of the Sample Variance | 第135-136页 |
| Ⅳ. Calculation of P, Q and S for Rayleigh Fading Channels | 第136-137页 |
| Ⅴ. Maximum-Likelihood Estimation of Residual CFO and SFO based on Pilot Symbols under Frequency Selective Channels | 第137-140页 |
| Reference | 第140-150页 |
| Publications and Projects | 第150-151页 |
| Acknowledgement | 第151页 |
