過采樣OFDM信號峰均功率比統(tǒng)計特性分析
Peak-to-Average Power Ratio of the Oversampling OFDM Signals
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摘要: 對連續(xù)正交頻分復用信號所構成的隨機過程進行分析,得到任意時刻之間信號相關性的解析表達式,并將其推廣到任意過采樣率情況下進行了討論。隨著過采樣率增加,采樣點之間相關性迅速上升,新增加采樣點對信號峰值平均功率比的影響下降。分析和仿真結果表明,在過采樣率為Nyquist采樣率的2倍時,采樣點之間可以近似滿足相互獨立同分布的關系,并得到此時信號峰值平均功率比概率分布的理論表達式。Abstract: The OFDM signal is analyzed as a continuous stochastic processes and the closed form expression of correlation function between any two given time instant is derived. When the sampling rate increases, the correlation increases quickly and the peak-to-average power ratio of oversampling OFDM signal changes neglectably. Especially, when oversampling factor is 2, the covariance matrix is analyzed. The results of analysis and simulation denote that all samples in one symbol are approximately independent. According to the result, the probability distribution function of peak-to-average power ratio is obtained.
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