What Is 802.11ac
The new wireless standard promises to be a revolution, new devices with the 802.11ac standard arrived. It is that we increasingly demand more and more wireless speed due mainly to high-definition multimedia content, data synchronization and backups of dozens of Gigas. Far from the ridiculous 2.5MB / s of Wi-Fi G transfer, which made anyone desperate.
At the CES in Las Vegas, some manufacturers submitted their bets. You have all the news published so far about this standard here: 802.11ac
Here is a summary of the main features of this standard that complements Wireless N.
802.11 ac Speed
The new wireless standard promises speeds of up to 1.3 Gbps (if implemented with Three-Stream). In a very short time we will see the first devices that will implement this technology. With this new technology we could see equipment with up to 8 antennas!
Table of Contents
- What Is 802.11ac
Although the wired network is still at 1 Gbps, we will not have a bottleneck since Gigabit Ethernet is Full-duplex, however, between that Wireless is half-duplex and interference losses, signal bounce etc. We will never reach the speeds offered by the wired network although we will be quite close (or so we hope).
Using 5 GHZ , and as we all know, it has less range than the 2.4 GHz band under the same conditions for a physical principle. This new standard includes Beamforming for transmission and reception.
What is beamforming? It is a type of MIMO category that consists of the formation of a signal wave reinforced by the offset in different antennas and is able to “overcome” obstacles reaching the customer along the best path. The Beamforming recognizes the elements that cause poor performance (walls, walls) and tries to avoid them, we can not forget that it uses advanced error detection techniques (why do we want high speed if the data arrives corrupt?).
The LPDC , (Low density parity check) and STBC (Space-Time Block Codes) technologies are also present in this new standard to maximize transmission efficiency and achieve high wireless speeds.
Therefore, we will have improved coverage.
Why Only In The 5ghz Band?
Because there is less interference with other Wi-Fi networks, cordless phones and other equipment such as wireless mice, but above all, because the frequency range is wider and therefore, we can use larger channel widths to transmit at maximum speed. In the 2.4GHz band with three-stream and a channel width of 40MHz, almost the entire range is occupied.
802.11ac Channel Width
A channel width of 80MHz will be used for each Stream, this is twice the current 802.11N. We double the channel width to increase the wireless speed. A 256-QAM modulation will be used to increase efficiency in data transfer.
Thanks to this transfer efficiency, computers that use 802.11ac will consume less battery (mobile phones, tablets, ultrabooks, laptops, etc.).
What Devices Will Integrate This Technology?
At the beginning it will be integrated by wireless routers and access points as well as external wireless cards via PCI or USB (we assume they will be USB3.0), to later be extended by wireless cards integrated in laptops, tablets and latest generation mobiles.
Unfortunately, marketing is very important and some manufacturers will bet on introducing an 802.11ac “lite” with lower performance. But the 802.11ac sign will be very large.
Although it is not in the technical implementation of the standard. We can almost ensure that it will be compatible with the new 802.11ac
This 802.11ac standard will give a lot to talk about. But above all, to enjoy what we like most, the networks, and here we will be to tell you everything! Including equipment analysis!