The IEEE 802.11ac standard (approved January 2014), brought numerous new and promising capacity features mostly in the 5GHz band. The features to be rolled out in 2 certification waves. Wave 1:
- Increased bandwidth to ~433Mbit/sec per 80MHz channel (Vs. 150Mbit/sec in 40MHz 802.11n), up-to ~1.3Gbit/sec on a three antenna (vs. 450Mbits in 802.11n)
- Higher PHY rates: MCS 8,9 – 256QAM to improve throughput
- Enabling more spatial streams (up-to 8)
And the 2nd certification Wave:
- Increase bandwidth to 866Mbit/sec per 160Mhz channel (or 80+80MHz) or 3.4G with 4 streams
- MU-MIMO -multiuser MIMO:
– Simultaneous transmission to multiple clients via SDMA
– MU MIMO is done on DL only
– Capacity increase
– Exploit BST degrees of freedom even when working with single antenna clients
– Reduces collision
– MU MIMO benefit with battery operatedenabling them longer battery life due to shorter operational time.
– Flexible – Each multi-user MIMO transmission may have a different number of spatial streams
– True practical benefit for outdoor conditions
However, gleaning the benefits of 802.11ac Wi-Fi may be easier said than done and real life environments could reduce the assumed “goodput” by dozens of percentage.
At Alvarion, we’ve taken on this challenge by developing algorithms, both in the 2.4GHz and 5GHz bands, that are able to overcome noise in an environment and get much closer to true802.11ac standard performance.
In our ongoing effort to evolutionize Wi-Fi and continually progress so that the optimal experience is attainable, we have been applying 3 main techniques:
- Dynamic Interference Handling (DIH) – optimizes performance in 2.4GHZ and 5GHz noisy environments
- Rate Adaptation (WARA) – dynamically chooses the best rate and bandwidth depending on changes in channel environment
- Automatic Channel Selection (ACS)
Our Algorithms simulate STA in each current environment and calculate the “goodput” it is liable to deliver in any MCSs for all streams. The result is consistently optimal rate and noise level selection. We tested our algorithms against leading companies in the field and we always get much better results.
Is your Wi-Fi ready to live up to standards? Learn more about our dedication to IEEE 802.11ac.
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