北京邮电大学学报

  • EI核心期刊

北京邮电大学学报 ›› 2006, Vol. 29 ›› Issue (5): 45-49.doi: 10.13190/jbupt.200605.45.wangj

• 论文 • 上一篇    下一篇

OFDM/CDMA峰值受限非线性的一种新处理方法

王 剑,山秀明,任 勇   

  1. 清华大学 电子工程系, 北京 100084
  • 收稿日期:2006-04-01 修回日期:1900-01-01 出版日期:2006-10-30 发布日期:2006-10-30
  • 通讯作者: 王 剑

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

WANG Jian, SHAN Xiu-ming, REN Yong   

  1. Department of Electronic Engineering, Tsinghua University, Beijing 100084, China
  • Received:2006-04-01 Revised:1900-01-01 Online:2006-10-30 Published:2006-10-30
  • Contact: WANG Jian

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。

关键词: 正交频分复用, 码分多址 , 峰值受限非线性, 冲激噪声

Abstract:

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 Gaussian 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.

Key words: orthogonal frequency division multiplex, code division multiple access, peak-limited nonlinearities, impulse noise

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