What decide band n speed?

[wfqk]

Hi Please see the below, which is from output of command netsh wlan show interface in PC:

My question is what decide the speed. In this case, Receive/Transmit Rate are 65 Mbps. It looks like distance and signal strength do not impact the rate. Anyone can explain it? Thank you

C:\Users\G>netsh wlan show interface

There is 1 interface on the system:

Name : Wi-Fi 2
Description : 802.11n USB Wireless LAN Card #2
GUID : 60ae483-05f8-413-9f27-079c15cead9
Physical address : 00:0f:01:43:23:f7
State : connected
SSID : Fios-3BOZ
BSSID : 20:c0:47:dd:a2:f0
Network type : Infrastructure
Radio type : 802.11n
Authentication : WPA2-Personal
Cipher : CCMP
Connection mode : Auto Connect
Channel : 1
Receive rate (Mbps) : 65
Transmit rate (Mbps) : 65
Signal : 60%
Profile : Fios-3BOZ

Hosted network status : Not started

[omz]

Its complicated. 

Higher signal strengths enable the use of higher PHY (PHYsical layer data) rates, also known as MCS (Modulation and Coding Scheme). Data rates highly dependent on the capabilities of the transmitting radio, the receiving radio and the environment. Signal strength (in dB) is directly proportional to the rate at which it can transfer data.

Mode	Maximum rate	Antenna transmit / Receive arrangements
1x1 20 MHz	72.2 Mbps	1 TX 1 RX
1x1 40 Mhz	150 Mbps	1 TX 1 RX
2x2 20 MHz	144.4 Mbps	2 TX 2 RX
2x2 40 MHz	300 Mbps	2 TX 2 RX
3x3 20 MHz	216.7 Mbps	3 TX 3 RX
3x3 40 MHz	450 Mbps	3 TX 3 RX

Hope this helps.

[wfqk]

Thank you so much for your reply

Based on these message you provided, it looks like 2x2 20 MHz 144.4 Mbps is double of 1x1 20 MHz. so how can we make 1x1 become 2x2? and how can we make/configure 20 MHz become 40 MHz? 

Can you send me a link? thanks

[omz]

See Channel Bonding - 

https://www.cisco.com/c/en/us/support/docs/wireless/4400-series-wireless-lan-controllers/108184-config-802-11n-wlc.html

Search for 1x1 - 

https://www.intel.com/content/dam/www/public/us/en/documents/pdf/next-gen-80211ac-wifi-for-dummies.pdf

[wfqk]

Very good explanation! thank you very much.