| OFDM系统中的差分调制及其性能 |
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| 引用本文： | 秦雅娟,刘元安.OFDM系统中的差分调制及其性能[J].铁道学报,2006,28(1):59-62. |
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| 作者姓名： | 秦雅娟 刘元安 |
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| 作者单位： | 1. 北京交通大学,电子信息工程学院,北京,100044
2. 北京邮电大学,电信工程学院,北京,100876 |
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| 摘 要： | 基于子载波采用高阶差分幅度相移键控（MDAPSK）的正交频分复用（OFDM）系统，针对其独特的数据帧结构，提出并定义了OFDM系统的几种差分调制方案，仿真了不同信道环境下各种方案的误码性能。仿真结果表明，针对时间选择性和频率选择性衰落信道衰落程度的不同，在满足一定的时间相关性和（或）频率相关性的条件下，采用相应的时域和（或）频域差分调制方案，可以保证MDAPSK—OFDM系统的误比特率（BER）维持在较低的水平。
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| 关 键 词： | 正交频分复用 差分幅度相移键控 时域差分 频域差分 时间相关性 频率相关性 |
| 文章编号： | 1001-8360（2006）01-0059-04 |
| 收稿时间： | 2004-12-14 |
| 修稿时间： | 2004-12-142005-06-15 |
Differential Modulation and Its Performance in OFDM Systems |
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| QIN Ya-juan,LIU Yuan-an.Differential Modulation and Its Performance in OFDM Systems[J].Journal of the China railway Society,2006,28(1):59-62. |
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| Authors: | QIN Ya-juan LIU Yuan-an |
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| Institution: | 1. School of Electronics and Information Engineering, Beijing Jiaotong University, Beijing 100044, China; 2. School of Telecommunications Engineering, Beijing University of Posts and Telecommunications, Beijing 100876, China |
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| Abstract: | Considering the special structure of transmitted data in orthogonal frequency division multiplexing(OFDM) systems,some differential modulation schemes are presented and defined for differential amplitude and phase shift keying(DAPSK) modulation in OFDM systems.The bit error rate(BER) performance is simulated with these modulation schemes respectively in different channels.The simulation results show that the BERs of Multilevent DAPSK(MDAPSK) OFDM systems can be maintained at a lower level relatively if the time correlation or(and) frequency correlation is satisfied and a proper time-domain or(and) frequency-domain differential modulation scheme is applied under time-selective and frequency-selective fading channels. |
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| Keywords: | orthogonal frequency division multiplexing(OFDM) differential amplitude and phase shift keying(DAPSK) time-domain differential frequency-domain differential time correlation frequency correlation |
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