| Rake接收机在超宽带系统中的均衡性能分析 |
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| 引用本文： | 张 良,杨晨阳.Rake接收机在超宽带系统中的均衡性能分析[J].通信学报,2005,26(10):78-83. |
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| 作者姓名： | 张 良 杨晨阳 |
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| 作者单位： | 北京航空航天大学电子与信息工程学院 北京100083
(张良)，北京航空航天大学电子与信息工程学院 北京100083(杨晨阳) |
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| 基金项目： | 教育部高等学校优秀青年教师教学科研奖励计划 |
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| 摘 要： | 从缩短信道时延扩展的角度出发,研究了Rake接收机的部分信道均衡能力,并推导出了Rake接收机均衡性能与Rake接收机的复杂度和信道衰减系数之间的关系;分析了信道估计误差对Rake接收机合并前后多径信道变化的影响。研究表明当存在估计误差时,Rake接收机仍然能实现均衡的作用,但是性能有所下降;由于低复杂度Rake接收机引入的估计误差较少,在低信噪比条件下其均衡性能甚至会优于高复杂度的Rake接收机。
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| 关 键 词： | 超宽带 Rake接收机 信道估计 信道均衡 |
| 文章编号： | 1000-436X（2005）10-0078-06 |
| 收稿时间： | 2005-05-12 |
| 修稿时间： | 2005-08-26 |
Channel equalization performance of rake receiver in UWB systems |
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| ZHANG Liang, YANG Chen-yang.Channel equalization performance of rake receiver in UWB systems[J].Journal on Communications,2005,26(10):78-83. |
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| Authors: | ZHANG Liang YANG Chen-yang |
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| Affiliation: | School of Electronics and Information Engineering, Beihang University, Beijing 100083, China |
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| Abstract: | Rake receiver was analyzed for its performance of channel shortening by deriving the delay spread of an equivalent channel after maximal-ratio combination.Both the relationship between the partially equalization performance of Rake receiver and the number of its taps,and the influence of channel estimation error on channel shortening performance were investigated.From the analysis,it's indicated that Rake receiver can still shorten the channel with channel estimation error,but there will be some extent of performance degradation.Moreover,the channel equalization performance of Rake receiver with lower complexity outperforms that with higher complexity in low SNR since less estimation error is introduced into Rake receiver with small number of taps. |
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| Keywords: | ultra wideband Rake receiver channel estimation channel equalization |
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