Multi-Antenna Reception Channel with coupled Sur-face Wave Propagation in IIoT Systems: Measurement, Modeling and Analysis
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Abstract
The surface wave (SW) and free-space coexisting propagation mechanisms in Industrial Internet-of-Things (IIoT) is investigated. A novel Single-Input Multiple-Output (SIMO) channel under the hybrid propagation mechanism is measured, modeled and analyzed. In the proposed channel model, one of the receiving (Rx) antennas is coupled with a long SW transmission line, with the rest ones distributed in free-space mode. A path loss (PL) model with three degrees of freedom is established, including d_T\text-RSW, d_T\text-RFS, and the offset angle \theta. The d_T\text-RSW dominate the interference degree of the SW propagation mode on the free-space propagation mode. Validation results show that the PL in the free-space propagation increases by 2–8 dB under the interference of the SW propagation mode. When d_T\text-RSW is fixed and the offset angle \theta is varied in the free-space mode, the PL increase is negligible (approximately 2 dB) for \theta less than 30°. When it is larger than 30°, the PL escalates significantly. When \theta is fixed and the d_T\text-RSW is varied, the fading severity is weakened as the d_T\text-RSW increasing. It indicates SW and free-space propagation can exist in IIoT scenarios, and the reliable deployment of the SW propagation can improve the transmission performance in IIoT scenarios.
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