文摘
英文文摘
学位论文独创性声明和学位论文使用授权声明
Acknowledgments
Abbreviations
Chapter1 Introduction
1.1 Outline of the Dissertation
1.2 Contributions
1.3 Published Papers
Chapter2 Propagation Characteristics of Mobile Radio Channels
2.1 Interference and Multipath Fading
2.2 Doppler Shift
2.3 Wideband and Narrowband Wireless Transmission
2.4 Summary
Chapter3 Principal Concepts of OFDM System
3.1 Introduction
3.1.1 Serial to Parallel Conversion
3.1.2 Orthogonal Subcarriers
3.1.3 Modulation Formats
3.1.4 Discrete Fourier Transform and OFDM
3.1.5 Forward Error Correction and Coded OFDM (COFDM)
3.2 The COFDM Transmitter
3.3 Channel Model
3.4 The OFDM Receiver
3.5 Guard Interval
3.5.1 Definition
3.5.2 Guard Interval Types
3.5.3 Elimination of by ISI Guard Interval
3.6 Summary
Chapter4 COFDM Model and Simulation Results
4.1 COFDM Model Used
4. 1. 1 AWGN Channel
4.1.2 Rayleigh Fading Channel
4.1.3 A Pilot Symbol Aided and Channel Estimation
4.2 Simulation results
4.2.1 Guard Interval Effect
4.2.2 Delay Spread Effect
4.2.3 Guard Interval and Delay Spread Dependence
4.2.4 SNR Effect
4.3 Summary
Chapter5 Guard Interval Optimization Using Genetic Algorithm
5.1 Introduction
5.2 Genetic Algorithm Elements
5.2.1 Population Representation and Initialization
5.2.2 The Objective and Fitness Functions
5.2.3 Selection
5.2.4 Crossover
5.2.5 Mutation
5.2.6 Reinsertion
5.2.7 Termination of the GA
5.3 The GA Operation
5.3.1 GA Operators
5.3.2 Simulation Results
5.4 Summary
Chapter6 The Proposed Concept of COFDM
6.1 Proposed COFDM System with a VGI
6.2 Proposed Concept
6.3 Delay Spread Estimator
6.4 Frequency Selectivity and Delay Spread Estimation
6.4.1 Frequency Correlation Estimation
6.4.2 Delay Spread Estimation
6.4.3 Calculation of RMS Delay Spread and Coherence Bandwidth
6.5 Channel Model
6.6 The Data Model
6.7 Simulation Results
6.7.1 Signal to Noise Ratio Effect
6.7.2 Maximum Delay Spread Effect
6.7.3 Number of Subcarriers Effect
6.8 Summary
Chapter7 Conclusions and Future Works
7.1 Conclusions
7.2 Future Works
References
