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5G frequencies and IoT
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8 aug. 2017
5G will employ low- (0.6 GHz - 3.7 GHz), mid- (3.7 – 24 GHz), and high-band frequencies (24 GHz and higher). In the U.S., the Federal Communications Commission (FCC) has allocated “low-band” spectrum at 0.6 GHz (e.g., 600 MHz), “mid-band” spectrum in the 3.5 GHz range, and 11 GHz of “high-band” frequencies including licensed spectrum from 27.5-28.35 GHz and 37-40 GHz, as well as unlicensed spectrum from 64-71 GHz which is open to all wireless equipment manufacturers.
Prior to widespread deployment, major cell phone carriers are experimenting with new technologies that employ “high-band” frequencies in communities across the country. The “high-band” frequencies largely consist of millimeter waves (MMWs), a type of electromagnetic radiation with wavelengths of one to ten millimeters and frequencies ranging from 30 to 300 GHz (or billions of cycles per second).
The characteristics of MMWs are different than the “low-band” (i.e., microwave) frequencies which are currently in use by the cellular and wireless industries. MMWs can transmit large amounts of data over short distances. The transmissions can be directed into narrow beams that travel by line-of-sight and can move data at high rates (e.g., up to 10 billion bits per second) with short lags (or latencies) between transmissions. The signals are blocked by buildings, and foliage can absorb much of their energy. Also, the waves can be reflected by metallic surfaces. Although antennas can be as small as a few millimeters, “small cell” antenna arrays may consist of dozens or even hundreds of antenna elements.
WHAT ARE 5G AND THE INTERNET OF THINGS?
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