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Publication
Performance evaluation of directional antennas in ZigBee networks under NLOS propagation conditions
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Advisor(s)
Abstract(s)
Many authors suggest directional antennas to enhance the transmission performance of
ZigBee networks. For line-of-sight propagation, directional antennas can extend the transmission
range or reduce the transmit power. Directional antennas may also reduce interference between
networks operating in the same frequency channel. However, these antennas may not perform
similarly under non-line-of-sight propagation conditions. This work presents a study with ZigBee
modules comparing the performance of a directional antenna with an omnidirectional one. The
measurements were conducted on a university campus for different propagation outdoor environ ments. A deconvolution technique was applied to estimate the received signal as a function of
the azimuth angle. The results demonstrated that the received power followed the gain difference
between antennas only for paths with low attenuation. Considering the same Effective Isotropic
Radiated Power (EIRP), the system with directional antennas started to lose packets at the same
distance as the omnidirectional antennas. The directional antenna did not allow the increase in the
link range compared to the omnidirectional antenna. The power consumption was also measured for
different transmit power levels of the ZigBee radio. The study showed that the control circuits of
directional antennas typically consume more power than omnidirectional antennas operating at a
higher transmit power level.
Description
Keywords
Radio wave propagation Channel measurements Directional antennas Wireless sensor networks Deconvolution technique . Faculdade de Ciências Exatas e da Engenharia
Citation
Azevedo, J. A., & Santos, F. E. (2022). Performance evaluation of directional antennas in ZigBee networks under NLOS propagation conditions. Electronics, 11(13), 2032.
Publisher
MDPI