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Characterisation of a time-variant wireless propagation channel for outdoor short-range sensor networks

机译：户外短距离传感器网络的时变无线传播信道的特性

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This study presents sample measurements and analysis characterising the radio channel for outdoor short-range sensor networks. A number of transmit and receive antennas are placed on the ground in an open area. The measured propagation channel is time varying because of the controlled motion of a person walking in the vicinity of the nodes. The statistics of both the line-of-sight (LOS) path and the scattered component of the measured channel are observed to be non-stationary. The channel (power) gains are found to be significantly influenced by the pedestrian movement, only when the LOS path is momentarily blocked. The authors present a generic approach to model receive signal fluctuations because of body blockage of the LOS path. Our approach, which is similar to the referenced work of Pagani and Pajusco, additionally models the time-variant Doppler spectrum of the residue (scattered) component of the measured channel, that is the remainder of the measured channel after the LOS path has been extracted. The proposed modelling approach is parameterised and validated from the measurements.
机译：这项研究提出了用于室外短距离传感器网络的无线电信道特征的样本测量和分析。许多发射和接收天线被放置在空旷的地面上。由于在节点附近行走的人的受控运动，因此测得的传播通道随时间变化。观测到的视线（LOS）路径和被测通道的散射分量的统计信息都是不稳定的。仅当LOS路径暂时受阻时，才发现通道（功率）增益受到行人运动的显着影响。作者提出了一种由于LOS路径的身体阻塞而对接收信号波动进行建模的通用方法。我们的方法与Pagani和Pajusco的参考工作相似，另外还对测量通道的残留（散射）分量的时变多普勒频谱进行建模，即提取LOS路径后剩余的测量通道。对拟议的建模方法进行参数化，并根据测量结果进行验证。

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