I was reading on MU-MIMO and something has strike me,
*Correct me if I am wrong.
On WiFi with SU-MIMO, a Single Devices used all the antenna possible to achieve maximum possible speed. So if one devices only has 2x2 ( Phone and Tablet ) with a 3x3 Router, it will use the best reception of the 2 Antenna possible from the Router. I was told if there are multiple clients connecting, the router will share its resources. So on SU-MIMO, a 2x2 802.11 ac allows a theoretical max of 867Mbps. I was told the amount of concurrent users are limited by the computation power of the Router CPU, since every users connection required some calculation. So if there were 20 users, each will get a theoretical max of ~43.3 Mbps. Taking a real world Wireless speed get 50% speed reduction and 20% multiple user overhead, we are getting ~17 Mbps per user.
This is very slow, and in a real world scenario with much higher interference it is likely to be even slower.
So how do enterprise AP from Ubnt and Rackus or Aruba handle this? I read on their spec they also only have 4x4 Antenna max, much like any consumer hardware except may be with much more powerful CPU and software. But wouldn't the theory still be the same? With 40 concurrent users we are talking about ~8 Mbps.
( And Steve Jobs telling people to get off the WiFi in Apple Event suddenly pops up in my head )
802.11ac Wave 2 with MU-MIMO was supposed to solve this, with better utilization of Antenna, But i read this more like help then solved. On the new Standard allows a maximum of 8x8 antenna, 80+80 / 160 Mhz, bringing a possible speed of 6.77Gbps, a similar 40 concurrent user will only get 67.7Mbps. And I guess there will likely be additional overhead from wider channels and MU-MIMO.
Edit: And i just find out MU-MIMO is for Download only......
So I guess, we found out now WiFi isn't as fast as we thought ( and it was never fast enough to begin with anyway ), especially in a multi user environment.
So how did 4G mobile network handle this? Surely Mobile Operator have to handle loads that are much higher then WiFi? And why we dont have Enterprise AP that gets 16 or 32 antenna?
*Correct me if I am wrong.
On WiFi with SU-MIMO, a Single Devices used all the antenna possible to achieve maximum possible speed. So if one devices only has 2x2 ( Phone and Tablet ) with a 3x3 Router, it will use the best reception of the 2 Antenna possible from the Router. I was told if there are multiple clients connecting, the router will share its resources. So on SU-MIMO, a 2x2 802.11 ac allows a theoretical max of 867Mbps. I was told the amount of concurrent users are limited by the computation power of the Router CPU, since every users connection required some calculation. So if there were 20 users, each will get a theoretical max of ~43.3 Mbps. Taking a real world Wireless speed get 50% speed reduction and 20% multiple user overhead, we are getting ~17 Mbps per user.
This is very slow, and in a real world scenario with much higher interference it is likely to be even slower.
So how do enterprise AP from Ubnt and Rackus or Aruba handle this? I read on their spec they also only have 4x4 Antenna max, much like any consumer hardware except may be with much more powerful CPU and software. But wouldn't the theory still be the same? With 40 concurrent users we are talking about ~8 Mbps.
( And Steve Jobs telling people to get off the WiFi in Apple Event suddenly pops up in my head )
802.11ac Wave 2 with MU-MIMO was supposed to solve this, with better utilization of Antenna, But i read this more like help then solved. On the new Standard allows a maximum of 8x8 antenna, 80+80 / 160 Mhz, bringing a possible speed of 6.77Gbps, a similar 40 concurrent user will only get 67.7Mbps. And I guess there will likely be additional overhead from wider channels and MU-MIMO.
Edit: And i just find out MU-MIMO is for Download only......
So I guess, we found out now WiFi isn't as fast as we thought ( and it was never fast enough to begin with anyway ), especially in a multi user environment.
So how did 4G mobile network handle this? Surely Mobile Operator have to handle loads that are much higher then WiFi? And why we dont have Enterprise AP that gets 16 or 32 antenna?
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