What is 802.11ax WiFi, and will it really deliver 10Gbps?. what is 802.11ax Wifi. can 802.11ax wifi deliver 10Gbps. Wireless standards tend to be proposed, drafted, and finally accepted what looks like a glacial pace. They have about 17 years since we started to see the first router and 802.11b wireless laptops.
What is 802.11ax WiFi, and will it really deliver 10Gbps?
In the meantime, we have only seen three other main rules hold since: 802.11g, 802.11n, and now 802.11ac. (I’m leaving out some less used as 802.11a for the purposes of this story.)
Now a new standard looms over the horizon. And if you thought that your new 802.11ac router’s maximum speed of 1,300Mbps was already fast, think again. With 802.11ac fully certified and out the door, the Wi-Fi Alliance is looking at its successor, 802.11ax — and it looks pretty enticing. While you may have a hard time getting more than 400Mbps to your smartphone via 802.11ac, 802.11ax should deliver real-world speeds above 2Gbps. And in a lab-based trial of technology similar to 802.11ax, Huawei hit a max speed of 10.53Gbps, or around 1.4 gigabytes of data transfer per second. Clearly, 802.11ax is going to be fast. But what is it exactly?
What is 802.11ax WiFi?
The easiest way to think 802.11ax 802.11ac is to start with – which allows up to four different spatial streams (MIMO) – and then massively increase the spectral efficiency (and therefore the maximum performance) of each stream. Like its predecessor, 802.11ax operates in the 5 GHz band, where there is much more space for the channels wide (80MHz and 160MHz).
With 802.11ax four MIMO (multiple input-multiple output) spatial streams, with each multiplexed stream with OFDA (access orthogonal frequency division) you are obtained. There is some confusion here as to whether the Wi-Fi Alliance and Huawei (which leads the working group 802.11ax) mean OFDA, or OFDMA. OFDMA (multiple access) is a well known technique (and is the reason LTE is excellent for what it is). However, OFDM, OFDA, and OFDMA relates to methods of frequency division multiplexing – each channel is separated by tens, or even hundreds, of smaller subchannels, each with a slightly different frequency. To then convert these signals through right angles (orthogonal), that can be stacked close together and yet be easily demultiplexed.
According to Huawei, the use of OFDA increases spectral efficiency by 10 times, so the theoretical maximum band width essentially translates into 10 times, but 4x is looking more like a real possibility.
How fast is 802.11ax?
Say you take 4x more conservative estimate and assume a massive 160MHz channel. In that case, the maximum speed of a single stream 802.11ax be around 3.5Gbps (866Mbps compared to a single stream 802.11ac). Multiply that a 4 × 4 MIMO network and a total capacity of 14Gbps is obtained. If you had a smartphone or laptop capable of two or three streams, you get some hot connection speeds 1GB per second or more.
In a more realistic configuration with 80 MHz channels, we are probably looking at a single flow rate of about 1.6 Gbps, which is still a reasonable / sec 200MB. If your mobile device supports MIMO, you could be looking at 400 or 600 MB / sec. And in an even more realistic configuration with 40MHz channels (as it is likely that you get on a crowded block of apartments), a single stream 802.11ax do you net 800Mbps (100MB / s), or network capacity total of 3.2Gbps.
802.11ax range, reliability, and other factors
So far, neither the Wi-Fi Alliance nor Huawei has said much about 802.11ax’s other important features. Huawei says “intelligent spectrum allocation” and “interference coordination” will be employed, but most modern WiFi hardware already does that.
It’s fairly safe to assume that working range will stay the same or increase slightly. Reliability should improve a little with the inclusion of OFDA, and with the aforementioned spectrum allocation and interference coordination features. Congestion may also be reduced as a result, and because data will be transferred between devices faster, that frees the airwaves for other connections. Source Extremetech
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