| 信道预测下的迫零波束形成系统的性能 |
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| 引用本文： | 卢敏,曾桂根,酆广增. 信道预测下的迫零波束形成系统的性能[J]. 应用科学学报, 2013, 31(3): 228-232. DOI: 10.3969/j.issn.0255-8297.2013.03.002 |
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| 作者姓名： | 卢敏 曾桂根 酆广增 |
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| 作者单位： | 南京邮电大学通信与信息工程学院，南京210003 |
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| 基金项目： | 国家自然科学基金(No.61171092)；江苏省科技支撑计划(工业)项目基金(No.BE2012182)资助 |
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| 摘 要： | 分析了反馈时延对于迫零(zero-forcing, ZF)波束形成系统和容量性能的影响，提出采用最小均方误差信道预测技术补偿反馈时延. 基于ZF系统信干噪比的概率密度函数，推导了信道信息存在误差时该系统和容量期望的解析表达式. 数值仿真表明，预测器有效利用了信道的时间相关性，补偿了反馈时延带来的容量损失，仿真结果与理论分析结果吻合.
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| 关 键 词： | 信道预测 迫零波束形成 和容量 |
| 收稿时间： | 2012-02-20 |
| 修稿时间： | 2012-04-05 |
Performance of Zero-Forcing Beam Forming System with Channel Prediction |
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| LU Min,ZENG Gui-gen,FENG Guang-zeng. Performance of Zero-Forcing Beam Forming System with Channel Prediction[J]. Journal of Applied Sciences, 2013, 31(3): 228-232. DOI: 10.3969/j.issn.0255-8297.2013.03.002 |
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| Authors: | LU Min ZENG Gui-gen FENG Guang-zeng |
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| Affiliation: | College of Telecommunications and Information Engineering, Nanjing University of Posts and Telecommunications, Nanjing 210003, China |
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| Abstract: | In this paper, capacity degradation of zero-forcing beam forming (ZFBF) system due to outdated CSI is investigated. A linear minimum mean square error (MMSE) channel predictor is employed to cope with the feedback delay and improve the capacity performance. Based on the power density function of the system’s signal to interference plus noise ratio (SINR), the analytic sum capacity expression relevant to the prediction error is derived. Numerical simulations show effectiveness of the predictor that exploits the channel’s temporal correlation against feedback delay. The simulation results are consistent with the analytic research. |
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| Keywords: | channel prediction zero-forcing beamforming sum capacity |
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