Experimental Li-Fi Reaching Speeds Up To 224Gbps

Researchers have been developing a new way of transmitting signals with light instead of radio frequency waves intended to replace Wi-Fi infrastructure. This experimental technology will be capable of carrying speeds of 224Gbps (28GB/s) throughput.

To put into perspective, even the newest routers with latest IEEE 802 standards do not even support close to the speed of Li-Fi. So let’s compare the current standard (802.11ac) to its predecessor (802.11n); not only did they double the spatial streams (multiple transmit and receive antennas) from 4 to 8, and channel width (wider channels, more data) from 40MHz to 80MHz; they also quadrupled the spectral efficiency from 64 to 256 (number of signals able to be transmitted over same frequency). Then you have beamforming that was also present in 802.11n (where it increases throughput by transmitting signals in a directional manner with tracking); however was not implemented as a standard therefore caused interoperability issues.

802.11ac operates on the 5GHz frequency band where attenuation occurs faster at such high frequencies – compared to 2.4GHz present in previous standards; therefore signal attenuation will occur as it is propagated through a medium, i.e. your router is on the other side of a wall. Li-Fi however, can be installed in every single room.

Currently 802.11ac is marketed at speeds of 1.3Gbps (166 MB/s); however, real world tests resulted in speeds of 364Mbps (45.5MB/s). Even at its theoretical maximum running at ~7gbps (~875MB/s) it still would not be anywhere near the speed of Li-Fi.



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