New wireless applications demand ever increasing data rates from both cellular and non-cellular networks. To satisfy these needs in non-cellular networks, the IEEE 802.11 (WLAN) standard—the most commonly used standard for wireless local area networks today—is continually being extended. This application note discusses WLAN standard IEEE 802.11n. It first describes the most important amendments to previous releases and the ambitious new measurement tasks. Then, it describes how to deal with these tasks using Rohde & Schwarz instruments. The main focus here is on transmission over several TX and RX antennas (MIMO). Building multi-standard signals using Rohde & Schwarz generators is also described. Screen shots from the analyzer taken on 802.11n signals complete the document.