| MIMO—OFDM低延迟信道估计改进算法 |
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| 引用本文： | 任春利,李洪烈,徐望婷,郭鹏远. MIMO—OFDM低延迟信道估计改进算法[J]. 黑龙江电子技术, 2014, 0(7): 154-157,162 |
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| 作者姓名： | 任春利 李洪烈 徐望婷 郭鹏远 |
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| 作者单位： | [1]南昌航空大学信息工程学院,南昌330063 [2]海军航空工程学院青岛校区,山东青岛266041 |
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| 摘 要： | 为了克服多输入多输出正交频分复用（MIMO—OFDM）移动系统中采用空间复用技术的下行链路性能出现衰退现象，提出一种信道估计改进算法。它根据信道状态并通过一个决策指导方案为4×4 MIMO系统提供大约4bit／s／Hz的数据。通过使用LDPC短码，在LDPC译码器输出端采用MIMO—OFDM符号重建方法，达到提高估计精度的目的。在3GPP MIMO空间信道模型下进行了仿真验证，结果表明指定速率下的估计精度得到改善。
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| 关 键 词： | 多输入多输出正交频分复用 决策指导信道估计 低密度奇偶校验 |
Improved algorithm for MIMO-OFDM low-delay channel estimation |
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| REN Chun-li,LI Hong-lie,XU Wang-ting,GUO Peng-yuan. Improved algorithm for MIMO-OFDM low-delay channel estimation[J]. , 2014, 0(7): 154-157,162 |
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| Authors: | REN Chun-li LI Hong-lie XU Wang-ting GUO Peng-yuan |
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| Affiliation: | 1. School of Information Engineering,Nanchang Hangkong University, Nanchang 30063,China;2. Naval Aeronautical Engineering Institute Qingdao Branch, Qingdao 266041, Shandong Province, China) |
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| Abstract: | In order to overcome performance degradation in spatial multiplexing downlink of the multipleinput multiple output （MIMO） orthogonal frequency-division multiplexing （OFDM） mobile systems, animproved channel estimation algorithm is proposed. It provides data with approx. 4hit/s/Hz for a 4 × 4MIMO setup through a decision directed scheme according to the channel statement. By using short LDPCcodes and employing a MIMO-OFDM symbol reconstruction method from the LDPC decoder output, Itachieves the purpose of improving the estimation precision. The simulation results based on 3GPP MIMOspatialchannel model show that the estimation precision is improved for a range of velocities which areappointed. |
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| Keywords: | MIMO-OFDM decision directed channel estimation LDPC |
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