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On the suitability of the 433 MHz band for M2M low‐power wireless communications: propagation aspects
Author(s) -
TusetPeiró Pere,
AnglèsVazquez Albert,
LópezVicario José,
VilajosanaGuillén Xavier
Publication year - 2014
Publication title -
transactions on emerging telecommunications technologies
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.366
H-Index - 47
ISSN - 2161-3915
DOI - 10.1002/ett.2672
Subject(s) - coherence bandwidth , link budget , multipath propagation , radio propagation , bandwidth (computing) , wireless , computer science , delay spread , electronic engineering , frequency band , telecommunications , channel (broadcasting) , broadband , radio spectrum , line of sight , electrical engineering , physics , engineering , astrophysics
The 433 MHz band is gaining relevance as an alternative to the 2.4 GHz band for machine‐to‐machine communications using low‐power wireless technologies. Currently, two standards are being developed that use the 433 MHz band, DASH7 Mode 2 and IEEE 802.15.4f. The article presents propagation models based on measurements conducted at the 433 MHz and 2.4 GHz bands that can be used for link budget calculations in both outdoor and indoor environments depending on node height. The results obtained show that the 433 MHz band has a larger communication range in both indoor and outdoor environments despite the negative effects of having a larger Fresnel zone. In addition, indoor propagation measurements are conducted in line‐of‐sight and nonline‐of‐sight conditions to determine the suitability of channel hopping to combat the effects of multipath propagation. Contrary to the 2.4 GHz band, the results show that channel hopping at 433 MHz does not provide any link robustness advantage because the channel coherence bandwidth is larger than the whole band bandwidth, and thus, all channels are highly correlated. Copyright © 2013 John Wiley & Sons, Ltd.