IEEE 802.11n Outdoor Performance

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Executive Summary

The MIMO (Multiple Input, Multiple Output) technology described in the IEEE 802.11n standard transforms the disadvantages of multipath propagation in wireless LAN transmissions into an advantage that enables an enormous increase in data rates. MIMO works with the multipath propagation of electromagnetic waves. Multiple transmit/receive paths in combination with signal processing to superimpose the signals produce a significant improvement in reception quality. The WLAN chipsets of the current 300-Mbps generation each feature two or three independent send/receive paths. For example, a 3x3 MIMO system is equipped with three transmitters and three receivers. However, the actual internal signal processing only works with two spatial streams.

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