| 摘要: |
| 在高速移动通信环境下,OFDM系统在传输过程中出现的多普勒频移和收发两端本地振荡器之间的频率偏差,形成子载波间干扰(ICI)并造成系统性能降低。在分析子载波间干扰机制的基础上,讨论了自消除方法和分段均衡方法,并提出一种利用加窗技术改进的分段均衡方法。仿真结果表明,采用该改进的分段均衡方法能更好地改善系统的性能,有约2 dB的信道估计增益。 |
| 关键词: 正交频分复用,载波间干扰(ICI),消除算法,分段均衡 |
| DOI： |
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| 基金项目:西南交通大学信息编码与传输四川省重点实验室开放研究基金 |
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| ICI Cancellation Algorithms for OFDM Systems |
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| Abstract: |
| For orthogonal frequency-division multiplexing(OFDM) communication systems with high mobile speed,the frequency offset caused by Doppler frequency offset and the frequency differences will introduce inter-carriers interference(ICI),which degrades the performance.In this paper,the ICI problems in OFDM systems are studied.Based on the analysis of ICI mechanism,the self-cancellation scheme and segment equalization scheme are mainly discussed,and an improved segment equalization scheme based on windowed technique is proposed,the performance of these algorithms are simulated.The result shows that the improved scheme can achieve better performance. |
| Key words: OFDM,ICI,cancellation algorithm,segment equalization, |
《电讯技术》编辑部 