"基于MATLAB的OFDM系统仿真与性能分析研究"

The undergraduate thesis "MATLAB Simulation and Performance Analysis of OFDM System" explores the core technology of Orthogonal Frequency Division Multiplexing (OFDM) in fourth-generation mobile communication systems. The document begins with a brief introduction to the development status and basic principles of OFDM. It analyzes the modulation and demodulation techniques of OFDM systems, deriving the general expression for OFDM symbols and providing design formulas for system parameters and the principle of windowing techniques. The implementation of OFDM systems based on IFFT/FFT is discussed, emphasizing the use of IDFT and DFT for system realization. The thesis focuses on the impact of guard intervals (CP), cyclic prefixes, and different channel estimation methods on the performance of OFDM systems under Gaussian and multipath Rayleigh fading channels, especially under ideal synchronization conditions. By establishing the OFDM system model, the author conducts computer simulations in MATLAB, providing reference design programs for transmission systems. The study compares the effects of guard intervals, cyclic prefixes, and channel estimation using the least squares (LS) method on the bit error rate of OFDM systems under various channel conditions, concluding with relatively ideal results. Keywords: Orthogonal Frequency Division Multiplexing; Simulation; Cyclic Prefix; Channel Estimation In conclusion, the undergraduate thesis "MATLAB Simulation and Performance Analysis of OFDM System" delves into the intricacies of OFDM technology, presenting a comprehensive examination of system design, implementation, and performance evaluation. Through MATLAB simulations and theoretical analyses, the study offers valuable insights into the optimization of OFDM systems under different channel conditions, contributing to the advancement of communication technologies in the era of 4G mobile networks.