Peak cancellation is a widely-used technique to reduce peak-to-average power ratio (PAPR) in orthogonal frequency division multiplexing (OFDM) systems. However, peak cancellation, when implemented with a window function in time domain, will introduce in-band distortion and out-of-band radiation due to the nonlinear processing. In this paper, the spectral distribution of cancellation noise is analyzed based on a Bussgang nonlinear processing model, which is applied to the noise-aided decoder at the receiver side. The theoretic results are compared with the numeric simulation, and the BER performance is provided.%基于抵消窗函数的峰值抵消是正交频分复用系统中一种有效的峰值功率抑制算法。在峰值抵消正交频分复用中，抵消窗函数的选择将决定抵消过程中带外功率泄露程度及带内噪声分布。该文推导了峰值抵消噪声的频域分布特性，并通过数值仿真验证分析了抵消窗函数选择及截断长度对带外功率泄露的影响。另外还给出了基于带内抵消噪声估计的接收端检测方法。数值仿真结果表明，与现有抵消噪声估计方法相比较，该文提出的方法能更好的进行噪声恢复，并提高接收端性能。
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