OFDM系统中的峰值抵消频域噪声分布特性研究  

Researches on Distribution of Frequency Domain Noise of Peak Cancellation in OFDM Systems

作　　者：肖悦[1] 何旭[1] 冀秋月[1] 马千里[1] 李少谦[1] 

机构地区：[1]电子科技大学通信抗干扰技术国家级重点实验室,成都611731

出　　处：《电子科技大学学报》2014年第3期342-346,共5页Journal of University of Electronic Science and Technology of China

基　　金：国家自然科学基金(60902026);国家科技重大专项(2010ZX03001-002-01);国家863计划(2011AA01A105)

摘　　要：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。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.

关 键 词：正交频分复用 峰值功率平均比 带外功率泄露 峰值抵消 

分 类 号：TN929.533[电子电信—通信与信息系统]