| DS-UWB中最大比合并滑动窗信道估计算法研究与改进 |
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| 引用本文： | 赵康僆,杨圣勤,都思丹. DS-UWB中最大比合并滑动窗信道估计算法研究与改进[J]. 电子测量技术, 2008, 31(5): 38-41 |
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| 作者姓名： | 赵康僆 杨圣勤 都思丹 |
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| 作者单位： | 1. 南京大学电子科学与工程系,南京,210093
2. 南京大学电子科学与工程系,南京,210093;总装备部工程兵科研一所,无锡,214035 |
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| 摘 要： | 本文推导了DS-UWB信道估计中最大比合并(maximum ratio combining)结合滑动窗(sliding window)算法的理论公式,给出DS-UWB系统中最大似然(maximum likelyhood)算法公式并与之比较,经理论分析和计算机仿真证明,在没有码间干扰的条件下,MRC-SW算法等价于一阶ML算法,其性能随着输出端采样频率的提高逼近ML算法.在接收端采样频率一定的条件下,本文还提出了一种通过延迟重复发送导频信号等效提高采样频率的方法,可以在不改变接收端硬件电路的情况下,大幅提高算法性能.
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| 关 键 词： | RAKE接收 最大似然算法 最大比合并 滑动窗算法 |
Improvement of MRC-SW channel estimation algorithm in DS-UWB |
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| Zhao Kanglian,Yang Shengqin,Du Sidan. Improvement of MRC-SW channel estimation algorithm in DS-UWB[J]. Electronic Measurement Technology, 2008, 31(5): 38-41 |
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| Authors: | Zhao Kanglian Yang Shengqin Du Sidan |
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| Abstract: | In this paper,the formulas of sliding window channel estimation algorithm with maximum ratio combining are given in DS-UWB system.Compared with formulas of maximum likely-hood algorithm in DS-UWB,MRC-SW algorithm is proved to be an equivalent to ML Algorithm when there is no ISI through theoretical analysis and computer simulations.It is also proved that with increase of sampling frequency,the performance of MRC-SW algorithm is improved and approaches to ML algorithm when the sampling frequency is high enough.Without changing the receiving circuit,a method to enhance the MRC-SW algorithm performance by sending the pilot symbols repeatedly for N times is also given. |
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| Keywords: | RAKE maximum likelyhood algorithm maximum ratio combining sliding window algorithm |
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