全相位OFDM系统的调制解调新算法

摘要

To solve the problem of frequency spectrum,a method using all-phase FFT is presented in this paper.Based on the theory of all-phase FFT and OFDM,the mathematical expression,model and algorithm of modulation and demodulation in all-phase OFDM system were derived.The all-Phase FFT can adjudicate the phase and amplitude by using the function of spectrum analysis.The simulation results show that All-Phase OFDM system has less phase error,spectrum leakage and lower BER than OFDM.%为解决OFDM系统中的频偏问题,利用全相位FFT技术,在全相位FFT和OFDM理论基础上,推导出全相位OFDM调制解调的数学表达式,建立了全相位OFDM调制解调系统模型和算法.全相位FFT利用自身的频谱分析功能来实现对信号相位和振幅的判决.实验结果表明：由频偏引起的相位误差和泄漏明显减小,系统误码率显著降低,验证出全相位OFDM的性能要好于现有的OFDM系统.