Characterization of ultra-wide bandwidth wireless indoor channels: a communication-theoretic view
Characterization of ultra-wide bandwidth wireless indoor channels: a communication-theoretic view
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DOI：
10.1109/jsac.2002.805031
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发表时间：
2002-12
期刊：
影响因子：
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通讯作者：
M. Win;R. Scholtz
中科院分区：
文献类型：
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作者：
M. Win;R. Scholtz
在一个典型的现代实验室/办公楼中进行了超宽带(UWB)信号传播实验。实验中使用的信号带宽超过1 GHz，无需特殊处理，差分路径延迟分辨率小于1纳秒。根据实验结果，从通信理论的角度描述了传播信道的特性，并给出了它对超宽带无线电接收机设计的启示。通过直方图和累积分布来量化UWB信号对多径衰落的稳健性。介绍了全RAKE(ARAKE)接收机和最大能量捕获选择性RAKE(SRAKE)接收机。ARAKE接收机是RAKE接收机设计的最佳方案(基准)，它可以降低多径引起的性能下降。使用最大似然检测器来检测测量波形的多径分量。作为UWB SRAKE接收机中使用的单径信号相关器数量的函数的能量捕获提供了复杂性与性能之间的折衷。基于测量的信道，给出了UWB SRAKE接收机的误码率性能，它是信噪比和接收机中相关器数量的函数。
An ultra-wide bandwidth (UWB) signal propagation experiment is performed in a typical modern laboratory/office building. The bandwidth of the signal used in this experiment is in excess of 1 GHz, which results in a differential path delay resolution of less than a nanosecond, without special processing. Based on the experimental results, a characterization of the propagation channel from a communications theoretic view point is described, and its implications for the design of a UWB radio receiver are presented. Robustness of the UWB signal to multipath fading is quantified through histograms and cumulative distributions. The all RAKE (ARAKE) receiver and maximum-energy-capture selective RAKE (SRAKE) receiver are introduced. The ARAKE receiver serves as the best case (bench mark) for RAKE receiver design and lower bounds the performance degradation caused by multipath. Multipath components of measured waveforms are detected using a maximum-likelihood detector. Energy capture as a function of the number of single-path signal correlators used in UWB SRAKE receiver provides a complexity versus performance tradeoff. Bit-error-probability performance of a UWB SRAKE receiver, based on measured channels, is given as a function of the signal-to-noise ratio and the number of correlators implemented in the receiver.