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中文摘要：
针对在无线电监测和认知无线电系统中，信号参数估计这一重要问题，证明了OFDM信号具有循环平稳性的必要条件是加循环前缀或有非矩形脉冲成型，并以线性周期时变变换（LPTV）模型为基础，推导了OFDM信号的循环谱表达式。通过对连续信号和离散信号进行计算机仿真，都得到了相同的OFDM信号循环谱图，实现了OFDM信号符号周期的估计，结果与理论分析相吻合。
英文摘要：
To explore the signal parameters estimation in radio monitoring and cognitive radio systems, this paper demonstrated the cyclostationarity of the OFDM signals with cyclic prefix or non-rectangular pulse shape. Furthermore, obtained the cyclic spectrum expressions of OFDM signal based on the model of linear periodically time-variant transformation （LPTV）. Computer simulation results of both the continuous signals and discrete signals are the same, and can estimate the symbol time of OFDM signals, results exactly match with the theoretical analysis.
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