| 采用不同STBC分集模式的OFDM系统性能分析 |
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| 引用本文： | 蔡丽萍,洪利,李芙蓉. 采用不同STBC分集模式的OFDM系统性能分析[J]. 计算机仿真, 2006, 23(8): 311-313 |
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| 作者姓名： | 蔡丽萍 洪利 李芙蓉 |
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| 作者单位： | 1. 中国石油大学计算机与通信工程学院,山东,东营,257061
2. 西安西北石油管道公司通信公司,陕西,西安,710021 |
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| 摘 要： | 由于空时编码技术和OFDM技术各自的特点，两者能很好地结合在一起，而影响空时编码获得最大分集增益的主要因素是系统的发射、接收天线数目和多径数目。该文详细分析了采用空时分组编码的OFDM系统的模型，通过改变发射分集和接收分集来仿真不同传输环境下OFDM系统的性能，并对不同分集模式性能进行对比分析，仿真结果表明，多普勒频移对系统性能有较大影响，增加发射天线个数能有效克服系统错误平台效应，接收端采用分集技术比发射端增加天线个数能更有效提高系统性能。在进行空时分组编码设计时，可以首先考虑增加接收天线数目以改善系统性能。
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| 关 键 词： | 正交频分复用 空时分组编码 分集模式 仿真 |
| 文章编号： | 1006-9348（2006）08-0311-03 |
| 收稿时间： | 2005-12-21 |
| 修稿时间： | 2005-12-21 |
Performance Analysis of OFDM System Using Different Diversity Schemes of STBC |
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| CAI Li-ping,HONG Li,LI Fu-rong. Performance Analysis of OFDM System Using Different Diversity Schemes of STBC[J]. Computer Simulation, 2006, 23(8): 311-313 |
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| Authors: | CAI Li-ping HONG Li LI Fu-rong |
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| Abstract: | Space - Time Block Coding technique and OFDM technique can be well combined together because of their features. The main factors which hinder STBC from achiving maximum diversity gain are the amount of transmitting and receiving antennas and muhipath. The paper introduces OFDM system model based on STBC in detail. The performance of OFDM system using different diversity schemes of STBC under different transmission environment is analyzed. The simulation result shows that Doppler shift has great influence on system performance. With increased transmission antennas we can effectively overcome system wrong platform effect. Adoption of diversity technique at receiving terminal can more effectively improve system performance. When we design STBC we can first take into account adding receiving antenna amount to improve system performance. |
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| Keywords: | Orthogonal frequency division multiplexing(OFDM) Space-time block coding(STBC) Diversity scheme Simulation |
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