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在理论上推导了采用快速傅里叶逆变换／傅里叶变换（IFFT／FFT）实现正交频分复用（OFDM）调制解调的可行性，分析了采用IFFT／FFT实现OFDM调制解调比传统方法更具优势；然后在数字信号处理器（DSP）硬件平台上对采用IFFT／FFT实现OFDM调制解调进行了验证。实验结果表明：采用IFFT／FFT不仅能正确实现OFDM信号的调制解调，而且还大大简化了OFDM系统结构，降低了系统实现难度，节约了成本。“,”The feasibility to realize the OFDM signal modulation and demodulation by using IFFT/FFT is derivated in theory, and compared with the traditional modulation and demodulation method, the application of IFFT/FFT in OFDM modulation and demodulation has more advantages. The experiment for application of IFFT/FFT on the DSP hardware platform is done, and the experimental results show that the application IFFT/FFT method could correctly realize the modulation and demodulation of the OFDM signal while greatly simplify the structure of OFDM system, reduce the system complexity and save the cost.