研究目的
Investigating the utilization of site-specific propagation characteristics to improve directional search procedures in the 28-GHz band for non-line-of-sight positions.
研究成果
The study concludes that utilizing site-specific propagation characteristics can significantly improve directional search procedures in the 28-GHz band, especially for NLOS positions. A performance gain of more than 2 dB was observed when selecting appropriate BS angles, highlighting the potential benefits of incorporating prior knowledge of propagation characteristics into system design.
研究不足
The study's findings are based on simulations in specific urban environments and may not be universally applicable. The performance improvement is conditioned by the severity of street canyon propagation and the probability of angle use. The method requires prior site-specific information, which may not always be available.
1：Experimental Design and Method Selection:
Utilized a ray-tracing tool to simulate wireless channels in specific urban environments at 28 GHz. The methodology focused on identifying the most effective base station (BS) angles for radio frequency (RF) illumination in non-line-of-sight (NLOS) conditions.
2：Sample Selection and Data Sources:
Simulated the wireless channel between a fixed transmitter BS and UE receivers positioned randomly in a well-defined grid of geographical points under NLOS conditions.
3：List of Experimental Equipment and Materials:
Applied a 3D commercial ray-tracing tool, BS power set to 30 dBm, center frequency at 28 GHz, and used ideal sector and isotropic antennas or pyramidal horn antennas of 24.5 dB gain and 10° beamwidth.
4：5 dB gain and 10° beamwidth.
Experimental Procedures and Operational Workflow:
4. Experimental Procedures and Operational Workflow: The BS and UE changed their antenna beam directions randomly within defined sets, and the UE measured the received power for different combinations of BS-UE antenna directions.
5：Data Analysis Methods:
Analyzed the received power and signal-to-noise ratio (SNR) to determine the effectiveness of selected BS angles in improving RF coverage.
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