Wireless Array
Installing the Wireless Array
37
Multipath signals were considered to be interference by 802.11a/b/g radios, and
degraded performance. In 802.11n, these signals are used to enhance
performance. This extra sensitivity can be used for greater range or higher data
rates. The enhanced signal is the processed sum of individual antennas. Signal
processing eliminates nulls and fading that any one antenna would see. MIMO
signal processing is sophisticated enough to discern multiple spatial streams (see
Multiple Data Streams — Spatial Multiplexing
). There are no settings to configure
for MIMO.
Multiple Data Streams — Spatial Multiplexing
Spatial Multiplexing transmits completely separate data streams on different
antennas (in the same channel) that are recombined to produce new 802.11n data
rates. Higher data rates are achieved by splitting the original data stream into
separate data streams. Each separate stream is transmitted on a different antenna
(using its own RF chain). MIMO signal processing at the receiver can detect and
recover each stream. Streams are then recombined, yielding higher data rates.
Figure 21. Spatial Multiplexing
Spatial multiplexing can double, triple, or quadruple the date rate, depending on
the number of transmit antennas used. You can configure the number of chains
(i.e., streams) separately for transmitting and receiving. By default, the Array uses
three chains for transmitting and receiving (see
“Global Settings .11n” on
page 279
).
%
Rx 1
Rx 2
Rx
M
%
Transmitter
Data Stream
Data Stream
Receiver
Tx 1
Tx 2
Tx
N
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