上海交通大学学报

上海交通大学学报（自然版） ›› 2011, Vol. 45 ›› Issue (03): 308-0312.

• 无线电电子学、电信技术 • 上一篇    下一篇

基于信道分割级联的正交频分复用子载波干扰消除算法

徐行辉, 何晨   

  1. （上海交通大学 电子信息与电气工程学院， 上海 200240）
  • 收稿日期:2010-03-21 出版日期:2011-03-30 发布日期:2011-03-30
  • 基金资助:

    国家高技术研究发展计划(863)项目(2009AA011505),国家自然科学基金资助项目(60772100,60832009,60872017)

A Novel ICI Cancellation Algorithm Based on Channel Segmentationcascade in OFDM System

 XU  Xing-Hui, HE  Chen   

  1. (School of Electronic, Information and Electrical Engineering, Shanghai Jiaotong University, Shanghai 200240, China)
  • Received:2010-03-21 Online:2011-03-30 Published:2011-03-30

摘要： 在高频段正交频分复用（OFDM）系统中子载波间干扰（ICI）较大，运用信道分割方法，将线性时变信道近似等效为时不变信道与无时延时变信道的级联，从而在接收端实现一维均衡抑制ICI，避免了高复杂度的信道频域响应矩阵的计算和求逆过程.分析和仿真表明，相对于现有的利用ICI相邻载波分布特性的低复杂度最小均方误差算法，算法在几乎不损失系统性能的同时，可将复杂度降低到O(N).

关键词: 正交频分复用, 载波间干扰, 线性时变信道, 频域均衡, 信道分割级联

Abstract:  For Orthogonal Frequency Division Multiplexing (OFDM) wireless systems with high frequency, deficiencies caused by Doppler frequency offset and the carrier phase noise are much higher，which will introduce InterCarrier Interference (ICI) and degrade the performance. Using channel segmentation，an equivalent method was presented in this paper，which transfers linear timevariant channel into the cascading of timeinvariant channel and timevariant channel with no delay. Then onedimensional equalization can be achieved at the receiver to suppress ICI, avoiding calculating the frequency domain channel response matrix and its inverse matrix. The analysis and simulation results show that, the proposed algorithm can effectively reduce the complexity to O(N) with almost no performance loss, compared to the existing low complexity MMSE.

Key words: orthogonal frequency division multiplexing(OFDM), intercarrier interference(ICI), linear timevariant channel, frequencydomain equalization, channel segmentationcascade (CSC)

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