Everyone knows WiFi, this technology that allows any device to communicate wirelessly is nowadays well integrated into our homes. It has known since its beginnings several evolutions, the best known are the standards a / b / g / n which improve sometimes the scope sometimes the flow.
The WiFi ac is now well integrated into the products of every day, whether some WiFi USB sticks or some laptops and CPL Kit, they are now compatible and just check the presence of the ” 802.11ac ” “in the product sheet.
The days are counted for WiFi 802.11n , indeed the standard which already dates from 2009 and which proposes a range of 100 meters for a theoretical flow up to 300 Mb / s (or 150 Mb / s on an antenna) is on the point of surrendering to his successor who sweeps all our products: WiFi 802.11ac . Ratified by the WiFi Alliance on January 8, 2014, this new standard promises to improve its predecessors on all points.
From a technological point of view, this standard uses only the 5 GHz frequency band, less disturbed and less congested than the conventional 2.4 GHz used previously, for theoretical speeds announced up to 1.3 Gb /s. Check more wifi cards recommendations here.
To hope to reach this rate, the products equipped with the 802.11ac Wifi will have to use a principle already used by the 802.11n: the MIMO, a technology which – without going into the really technical details – makes it possible to use several antennas in order to increase the exchanges of information. The most common is the 2×2 for 2 antennas in reception and 2 in emission but more and more products will offer 3×3 see 4×4, enough to significantly increase the flow each time.
The other big change is in the diffusion of the waves: the ” Beamforming “. To keep things simple, wireless communications are currently working as follows: the transmitter transmits at full power a signal in a circle around it, picking up receivers throughout the area and leaving other “dead” areas that make themselves unnecessary interference. The principle of “Beamforming” is to always broadcast in a circle but as soon as the receiver is detected to concentrate a directional signal towards it.
Finally, there are only advantages, thanks to these changes in the operation and the method of diffusion of the signal, WiFi 802.11ac will be less disturbed, faster, more intense and consequently will reduce the consumption of the equipped devices.
At home, comfort will be undeniable with streaming in full HD, file transfers and games in networks. The deal should even change for the irreducible who likes me swore by an Ethernet cable.
What about backward compatibility with older devices? The use of a 5 GHz band could be troublesome because only the devices equipped with WiFi 802.11n (or WiFi 802.11a) are compatible but the chip manufacturers reassure us: for the transition to be done smoothly Wifi ac will be proposed initially in double band ac + n to be compatible with all existing products.
The list of manufacturers offering the 802.11ac wifi continues to grow. For mobility LG and Samsung respectively offers a G5 and a Galaxy S7 equipped with a WiFi chip 802.11ac 2×2 MIMO. Side computers are Toshiba, Asus, and Lenovo who already offer products equipped with WiFi standard ac!
Last but not least, all Intel® Core ™, Pentium®, Celeron ™, and Intel® Wi-Fi 11ac computers offer the ability to project content on a TV (WiDi technology).
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