January 2018
Intermediate to advanced
524 pages
13h 33m
English
Content preview from Internet of Things for Architects
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Cellular access technologies
It is important to understand how cellular systems work with multiple users of voice and data. There are several standards worth reviewing, similar to concepts covered for WPAN and WLAN systems. Before LTE was supported by the 3GPP, there were multiple standards for cellular technology, particularly GSM devices and CDMA devices. It should be noted that these technologies are incompatible with each other, from infrastructure to the device:
- Frequency Division Multiple Access (FDMA): Common in analog system systems but rarely used today in digital domains. It is a technique whereby the spectrum is divided up into frequencies and then assigned to users. One transceiver at any given time is assigned to a channel. ...
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