一种改进的室内无线电波传播模型

An Improved Indoor Radio Wave Propagation Model

摘要: 无线电波传播特性主要取决于收发设备之间的距离，然而当电波传播环境复杂时，对数距离传播模型的预测误差较大。为了解决这一问题，提出了一种由传播距离和方位角共同确定的改进的室内无线电波传播模型，并以云南大学信息学院四楼局部区域为例对模型的有效性进行了仿真和验证。结果表明，所提出的模型能够比较准确地预测满足特定传播距离与方位角的区域的无线电波传播特性，并可以通过参数n的取值推断预测区域与在发射设备之间存在建筑墙体的数量。在发射场景1下对数距离传播模型的最大均方根误差为12 dB，所提模型仅为2 dB；在发射场景2下对数距离传播模型的最大均方根误差为25 dB，所提模型仅为5 dB。不同场景下得到相似的结论表明所提模型具有普适性，同时预测误差小表明其具有潜在的应用价值。

Abstract: The radio wave propagation characteristics mainly depend on the distance between the transceiver devices. However, when the radio wave propagation environment is complex, the prediction error of the log-distance path loss model becomes large. In order to solve this issue, an improved indoor radio wave propagation model determined jointly by the propagation distance and azimuth angle is proposed, and the effectiveness of the model is simulated and verified by taking the local area on the fourth floor of the School of Information Science & Engineering, Yunnan University as an exam-ple. Results show that the proposed model can accurately predict radio wave propagation charac-teristics in areas satisfying the specific propagation distances and azimuth angles, and can infer the number of building walls between the predicted area and the transmitting device through the value of the parameter n. In scenario 1, the maximum root mean square error of the log-distance path loss model is 12 dB, and the proposed model is only 2 dB; in scenario 2, the maximum root mean square error of the log-distance path loss model is 25 dB, and the proposed model is only 5 dB. The similar conclusions obtained in different scenarios show that the proposed model is universal, and the small prediction error shows that it has potential application value.