摘要
正交频分复用技术利用相互正交的多个子载波传送信息,具有频谱利用率高、调制方式灵活、抗多径干扰等特点,已成为第四代移动通信系统的关键技术。本文主要研究了多音干扰对OFDM系统性能的影响,并通过仿真实验,比较了多音干扰加入前后系统性能的变化,验证了理论分析的结果。
Orthogonal Frequency Division Multiplexing(OFDM) transmits information through orthogonal multiple sub-carriers.It has become one of the key techniques in 4th generation mobile communication systems due to its high data rate transmission capability with high bandwidth efficiency,flexible modulation modes and its robustness to multi-path delay.This thesis focuses on the performance for OFDM system with multi-tone interference.Starting from the principle of OFDM system,modulation principle and system model are shown in this paper.The key techniques of OFDM system such as channel estimation,timing and frequency offset estimation are investigated in this paper.The principle of multi-tone interference is also introduced.The performance for OFDM system is analyzed by simulation with and without multi-tone interference.Comparing the results,it is consist with the theoretical analyze.
