Though each next-generation mobile network has featured order of magnitude improvements in data rates and latency performance, 5G arguably features more than the typical amount of technology innovation. Where 4G is limited to 20-Mhz channels, 5G can support channels hundreds of MegaHertz wide.
5G also features more-flexible time and frequency slots, leading to lower latency performance, as well as coding that supports higher bandwidths.
Massive multiple input-multiple output radios are both necessary to deal with millimeter wave signals, but also provide better coverage and capacity when using previously-unusable spectrum. Non-line-of-sight 5G radios also are key for mobility applications using millimeter wave frequencies, which otherwise would remain mostly line of sight limited.
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