| 低轨道CDMA卫星下行链路多径信道估计 |
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| 引用本文： | 赵国栋,丁晟,刘会杰,杨根庆.低轨道CDMA卫星下行链路多径信道估计[J].上海航天,2009,26(6):44-48. |
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| 作者姓名： | 赵国栋 丁晟 刘会杰 杨根庆 |
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| 作者单位： | 中国科学院,微小卫星联合重点实验室,上海,200050 |
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| 摘 要： | 为改善低轨道（LEO）卫星下行链路中多径时延扩展小于1个码片周期时最大似然信道估计方法因有色噪声影响导致的低信噪比时急速下降的性能。提出用卡尔曼滤波法对最大似然估计输出的估值进行滤波处理。仿真结果表明：当LEO卫星码分多址（CDMA）下行链路存在速率300 b/s的连续导频信号时,用最大似然估计级联卡尔曼滤波器的多径信道估计法能在载噪比40 dB的信噪比条件下具较好的性能。
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| 关 键 词： | 低轨道卫星 码分多址 多径衰落 信道估计 卡尔曼滤波 |
Multipath Channel Estimation of LEO CDMA Satellite Downlink |
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| ZHA Guo-dong,DING Sheng,LIU Hui-jie,YANG Gen-qing.Multipath Channel Estimation of LEO CDMA Satellite Downlink[J].Aerospace Shanghai,2009,26(6):44-48. |
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| Authors: | ZHA Guo-dong DING Sheng LIU Hui-jie YANG Gen-qing |
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| Institution: | (Micro-Satellite State Key Joint Laboratory,CAS,Shanghai 200050,China) |
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| Abstract: | To improve the sharp performance degrades of the maximum likelihood estimation（MLE） under low signal nose ratio（SNR） caused by the color noise when the delay spread was smaller than one chip interval in the downlink channel of low earth orbit（LEO） satellite systems,a Kalman filter was put forward to filter the estimation results from MLE methods in this paper.The simulation results showed that the MLE added a Kalman filter could obtain good SNR performances for carrier noise ratio was at 40 dB when LEO satellite downlink channel existed a continuous 300 b/s pilot signal. |
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| Keywords: | Low earth orbit satellite Code division multiply address Multi-path fading Channel estimation Kalman filter |
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