| 移动OFDM系统中子信道干扰及其均衡算法 |
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| 引用本文： | 钱学荣,张力军.移动OFDM系统中子信道干扰及其均衡算法[J].信号处理,2003,19(3):230-233. |
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| 作者姓名： | 钱学荣 张力军 |
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| 作者单位： | 南京邮电学院通信工程系,南京,210003 |
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| 摘 要： | 移动衰落信道中正交频分复用(OFDM)系统的子信道干扰(ICI)是引起系统性能下降的主要因素。本文分析了ICI对系统性能的影响,结果表明子信道干扰取决于信号能量E_s,子信道数N,和多普勒频移f_d,与信号星座无关。为了消除ICI,我们提出一种基于Jacobi迭代方法的均衡算法。考虑到子信道干扰主要影响相邻子信道的实际情况,兼顾系统性能和算法复杂性,进一步提出改进算法。文章最后给出16QAM调制的OFDM系统性能的仿真结果。
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| 关 键 词： | 正变频分复用 子信道干扰 信道均衡 Jacobi迭代法 |
| 修稿时间： | 2002年10月24 |
Interchannel Interference Analysis and Equalization for OFDM in Mobile Environment |
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| Qian Xuerong,Zhang Lijun.Interchannel Interference Analysis and Equalization for OFDM in Mobile Environment[J].Signal Processing,2003,19(3):230-233. |
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| Authors: | Qian Xuerong Zhang Lijun |
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| Abstract: | Interchannel interference (ICI) is a dominant source of error for OFDM systems over mobile dispersive fading channels. In this paper, the effects of ICI in mobile OFDM system are analyzed firstly. It is shown that ICI is only a function of the symbol energy (Es), the subchannel number (N) and the Doppler frequency (fd), and is independent of signal constellation. Then, to eliminate ICI, an equalization algorithm based on Jacobi iteration is proposed. Considering the fact that the most of ICI energy is kept in the neighborhood subchannels, we further modify the algorithm to compromise between the complexity and system performance. Finally, the symbol error rate of a 16QAM system is present by means of simulation results. |
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| Keywords: | orthogonal frequency division multiplexing(OFDM) interchannel interference (ICI) channel equalization jacobi iteration |
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