载波频率偏移对OFDM的影响及仿真分析

随着现代通信技术的发展,特别是无线通信业务的增长,可利用的频带日趋紧张.因此,采用新的高效抗干扰调制技术、提高频带的利用率一直为人们所关心,OFDM技术的出现则为这些问题的解决开辟了一条新的路径.然而,由于OFDM系统的敏感性,载波频率偏移会对传输系统产生较大的影响.为了定量地分析载波频率偏移对于OFDM系统的影响,论文建立了OFDM系统的模型,分析了其优缺点,并在此基础上,利用改进的IDFT和DFT的方法,取子信道数目不同时,对载波频率偏移造成的影响进行了仿真,仿真结果说明了频率偏差对接收端信噪比的影响:OFDM系统对于载波频率偏移非常敏感.

Effect of Carrier Frequency Offset on OFDM and Simulation Analysis

With the development of communication,especially wireless communication,the frequency resource is limited.So,new modulation techniques with robustness for multi-path delay spreading and new techniques for improving frequency utilization are needed.Orthogonal Frequency Division Multiplexing(OFDM) is one of the promising techniques that meet such requirements.The synchronization schemes in OFDM systems are studied in this thesis.The main contributions of this thesis include: the modeling of OFDM system and its advantages and disadvantages,simulation of the effect of carrier frequency offset on OFDM when the sub-channels are different by using of IDTF and DFT.