OFDM信号频谱分析及两种带外辐射抑制技术的性能比较

Spectrum of OFDM Signal and Performance Analysis of Two Types of out of Band Power Suppression Schemes

加入循环前缀之后的OFDM信号的频谱不再是若干函数叠加的形式,子载波频谱不仅具有虚部,而且子载波间也不再保持正交性。基于这种更准确的OFDM子载波频谱模型,重新衡量两种抑制OFDM信号功率谱带外辐射方案的性能,为认知无线电系统的调制方案设计提供参考。

The spectrum of OFDM signal, added by Cyclic Prefix, is not simply the superposition of functions. Moreover, the spectrum of OFDM subcarrier has imaginary party and the orthogonality among subcarriers is destructed. Based on this spectrum model, two schemes of suppressing out-of-band radiation are re-evaluated. The performance comparison of suppression is given through simulation.