OFDM/CDMA峰值受限非线性的一种新处理方法  

A New Approach for OFDM/CDMA Systems with Peak-Limited Nonlinearities

作　　者：王剑[1] 山秀明[1] 任勇[1] 

机构地区：[1]清华大学电子工程系,北京100084

出　　处：《北京邮电大学学报》2006年第5期45-49,共5页Journal of Beijing University of Posts and Telecommunications

基　　金：国家自然科学基金项目(60172023)

摘　　要：提出了研究正交频分复用(OFDM)信号通过高功率放大器产生的带内非线性畸变的一种新方法.与广泛使用的将畸变近似成加性高斯噪声相比,这种新方法应用了平稳高斯过程的高电平渡越特性和散射噪声理论,可以深刻了解削峰畸变的本质、由削峰产生的冲激噪声的详细信息以及它们对于OFDM系统性能的影响.提出的方法还可以用于研究具有较高峰均比和峰值受限非线性的通信系统,并用于大容量码分多址(DS-CDMA)系统下行链路的性能分析等.A new evaluation approach for the in-band nonlinear distortion, which is formed by the orthogonal frequency division multiplex（OFDM） signal passing through the high power amplifier, is presented. Comparing with widely used nonlinear additive Oaussian noise models, the new approach is based on the properties of the large deviations of a stationary Gaussian process and shot noise theories, which offer important insights into the true nature of clipping distortion as well as detail information on clipping induced impulse noise and its impacts on the system when the OFDM signal is transferred and processed. The methodology can also be extended to be used in many communications systems with high peak-average-ratio and peak-limited nonlinearities, and the downlink performance analysis of large capacity code division multiple access（CDMA） systems.

关 键 词：正交频分复用 码分多址 峰值受限非线性 冲激噪声 

分 类 号：TN929.53[电子电信—通信与信息系统]