正交频分复用技术原理分析

Theoretical Analysis of OFDM

通过建立连续时间模型和离散时间模型,对OFDM的原理进行了详细推导与分析,并得出结论:当循环前缀的长度大于信道频率响应的时间宽度,以及在OFDM符号持续时间内信道衰落近似为常数时,OFDM系统可以看作是一组并行高斯信道。这样就大大简化了接收机均衡器的设计。文章还从时间-频率的角度对OFDM做出了解释,并对OFDM信号的产生方法进行了归纳总结。

Based on continuous and discrete time model,this paper analyses detailedly principles of OFDM.Concluding that the continuous-time OFDM system can be interpreted as parallel Gaussian channels if the frequency response of channel is less than cyclic prefix and the attenuation of channel is constant in OFDM symbol interval.Then simplifying the design of phase-and-amplitude equalizer.Finally,the principle of OFDM is interpreted from the perspective of time-frequency domain,and inducing the method of transmitting and receiving OFDM signal.