In the previous article, we introduced you had 802.11ax standard of provenance and the new challenges it brings. However, it is now a wide range of popular and 11ac standard put together, but we may not be able to accurately and clearly distinguish the specific technical differences between the two, even skeptical, 11ac has been able to meet the required family we really need 11ax it? I have seen the articles in this issue, the answer from now.
802.11ax also known as "high-efficiency wireless standard" (High-Efficiency Wireless, HEW), the average transfer rate of each user's user-intensive environment to enhance more than four times that agreed to provide more users in high-density environments and a steady stream of data (average transmission rate), to reduce network congestion, and significantly improve the speed of wireless coverage.
Further, 802.11ax addition to the standard is backward compatible with 11a / b / n / ac, but also the average transmission rate per user density of these scenarios railway stations, airports and so improve four times.
802.11ax 11ac Although similar in channel widths and data rate, but it can with the new 1024-QAM modulation and coding combination (MCS 10 and 11). Moreover, through the MU-MIMO and OFDMA technology, but also for the designated downlink and uplink multi-user operation.
11ax can provide four times the OFDM FFT, narrower subcarrier spacing (density of 4 times) and 4 times the time codes, multipath fading environment to improve the stability and performance of the outside, and the flow channels and access situation. Due to its power management even better, it can bring more long-lasting battery life.
For all of these "capabilities", 802.11ax which can achieve the target application needs it?
First, mobile data is removed. By the year 2020, Wi-Fi dismount traffic generated each month to reach 38.1EB, and continuing beyond the monthly mobile traffic (30.6EB) estimates, the equivalent of these networks move more than 6000 Blu-ray movies per minute;
Secondly, has a large number of access points, and has held high-density user environment of heterogeneous devices, you know, "airport Wi-Fi" ≠ "home Wi-Fi";
The third is the ability to mix well adapted to outdoor and outdoor environments.
In contrast, although the 802.11ac standard can achieve near 866Mbit / s link speed of the stream in a single space, 160MHz wider channel, and the modulation order of the 256-QAM, when using 8 spatial streams (standard specifies when the maximum number), 11ac will achieve up 6.97Gbit / s of the theoretical value of the speed.
But! If not living in RF laboratory, it will be difficult to achieve 7Gbit / s high-speed wireless network. So in reality the airport terminal, each time you want to connect to public Wi-Fi Internet or check e-mail, its speed is very collapse.
Another very important point must be to get to. We say that only runs on 802.11ac 5GHz band, and 802.11ax able to 'take-all' 2.4GHz and 5GHz dual-band. However, 11ax also covers a major change coming before the subcarrier spacing is reduced to 1/4 of the 802.11 standard, in order to retain the existing channel bandwidth.
Not only that, 802.11ax using a single user and multi-user two modes of operation. Sequences in a single user mode, the STA long as the wireless (radio base station) to obtain a media access will each time a data transmission and receiving operations; to multi-user mode, can simultaneously operating a plurality of non-AP STA and the normal mode will be further divided into the chain and this chain multiple users. Here, you may feel a bit confusing, so we did a table, the difference between 11ac contrast to more intuitive and 11ax:
We are talking about today 802.11ax wireless standard, in fact, there are many technical advantages, even some we do not even listen uncommon words have never heard of, Leaving aside those sophisticated technology, which can run simultaneously on a single in 2.4G and 5G band had been on very lovable.
So powerful, when will the wide range of popular it? In fact, Broadcom, Qualcomm, Marvell and other chip makers have now been introduced chips based 802.11ax technology, and like Asus, Rui Jie, network equipment manufacturers have also introduced the corresponding household and enterprise-class products, but is now able to support the terminal 11ax has not yet come out, I believe it is only a matter of time in the trend.
Original Address: https://www.eeboard.com/news/802-11ax-802-11ac-wi-fi/
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