Abstract
The spectrum of millimeter waves lay above 30GHz. The band between 30GHz up to 300GHz is called Extremely High Frequencies (EHF). This wide spectrum is relatively free of users and have recently became relevant for realizations of wireless communications an radars, including the fifth generation (5G) of cellular communications. Due to the short wavelengths, the propagation of millimeter waves can be analyzed using quasi-optical ray techniques. We present a multi-ray analysis of millimeter wave wireless link in the presence of multipath. The analysis is applicable for indoor and outdoor links and considers reflections from walls and buildings. It is shown that line-of-sight is not necessarily required in scenarios where multiple reflections exist as in long corridors, canyons and tunnels. The theoretical results are verified experimentally with a link in the W-band (94GHz).
Highlights
Indoor communication link suffers from obstacles that can disturb the signal to travel straight from the transmitter to the receiver
The Two Ray Model is applied in a simple scenario when the transmitter and the receiver are placed above ground at outdoor environment and the signal is reflected to the receiver only from the ground
Multi-ray Model is used in an indoor environment, where several reflections occur from obstacles, surfaces, walls, ceiling and floor
Summary
Indoor communication link suffers from obstacles that can disturb the signal to travel straight from the transmitter to the receiver. The Two Ray Model is applied in a simple scenario when the transmitter and the receiver are placed above ground at outdoor environment and the signal is reflected to the receiver only from the ground. Interesting phenomena emerge when the communication link is in narrow corridors or in tunnels Such effects may arise in outdoor links operating in long canyon environment. Those scenarios can be treated as extremely long rooms where the front and back walls are far away from the transmitter and receiver. Ray tracing become relevant when the wavelength is much shorter than the dimensions of the tunnel or the canyon It uses Geometrical Optics (GO) approach to describe the signal strength. We found a reasonable correspondence between our model and our lab results
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