User Guide

Wireless Array
36 Installing the Wireless Array
should review the settings for your deployment, especially channel bonding. A
global setting is provided to enable or disable 802.11n mode. See “Global Settings
.11n” on page 279 to configure 802.11n operation.
MIMO (Multiple-In Multiple-Out)
MIMO (Multiple-In Multiple-Out) signal processing is one of the core
technologies of 802.11n. It mitigates interference and maintains broadband
performance even with weak signals.
Prior to 802.11n, a data stream was transmitted via one antenna. At the receiving
end, the antenna with the best signal was selected to receive data. (Figure 19)
Figure 19. Classic 802.11 Signal Transmission
MIMO signal processing uses multiple antennas to send and receive data. It takes
advantage of multipath reflections to improve signal coherence and greatly
increase receiver sensitivity (Figure 20).
Figure 20. MIMO Signal Processing
Frequency Across Subcarriers
Attenuation
Antenna 1 Signal
MIMO Processed Signal
Antenna 2 Signal
Antenna 3 Signal
Receiver