| OFDM系统中不同调制方式抗多径干扰的性能分析 |
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| 引用本文： | 梁晓雯,朱近康.OFDM系统中不同调制方式抗多径干扰的性能分析[J].中国科学技术大学学报,2004,34(2):196-201. |
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| 作者姓名： | 梁晓雯 朱近康 |
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| 作者单位： | 中国科学技术大学电子工程与信息科学系,合肥,230027 |
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| 基金项目： | 国家“8 6 3”计划 (2 0 0 1AA1 2 1 0 31 ) |
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| 摘 要： | 在带有循环保护间隔的OFDM中 ,对不同调制方式的抗多径干扰的性能进行了分析 ,并给出了仿真结果 .在无信道估计和有信道估计两种情况下 ,讨论了信干比对系统抗多径干扰性能的影响 .仿真结果表明 ,信道估计可以使保护间隔起作用的信干比门限值大大降低
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| 关 键 词： | 正交频分复用 调制方式 多径干扰 |
| 文章编号： | 0253-2778(2004)01-0196-06 |
| 修稿时间： | 2002年9月29日 |
Performance Analysis of Different Modulations' Abilities to Combat Multipath Propagation in OFDM Systems |
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| LIANG Xiao wen,ZHU Jin kang.Performance Analysis of Different Modulations'''' Abilities to Combat Multipath Propagation in OFDM Systems[J].Journal of University of Science and Technology of China,2004,34(2):196-201. |
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| Authors: | LIANG Xiao wen ZHU Jin kang |
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| Abstract: | The effects of multipath propagation on the received signal of a basic OFDM system, in which a cyclic prefix is adopted, are discussed and an approximate expression of the received signal in a slow fading channel is given. Some simulation results are provided which show the abilities of PSK, DPSK and QAM modulated OFDM system to combat multipath interference. The effects of signal interference amplitude ratio (SIR) on performance suppressing multipath propagation are also considered. Simulation results indicate that the cyclic prefix is indeed an efficient technique to combat multipath propagation and the SIR is also a remarkable factor for different modulation schemes. Channel estimation can reduce the required SIR greatly for same symbol error probability. |
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| Keywords: | OFDM modulation multipath propagation |
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