It’s important to recognize that a wireless device’s type of 802.11 technology and the number of spatial streams supported are the limiting factors in increasing the MCS index (and therefore the maximum data rate possible). Since this is a hardware limitation, it acts as the ceiling for what is possible.
Many articles have been written on how to properly calculate the quality of a WiFi connection. In this blog we will introduce one concept, the modulation and coding scheme (MCS) index, and show how it can be used to understand the quality of a WiFi connection for Windows and Mac OS computers. Modulation refers to the way data is formatted prior to transmission. The coding scheme refers to how the data is encoded while being transmitted.