Wireless Access Point
44
Installing the Wireless AP
Up to Eight Simultaneous Data Streams — Spatial Multiplexing
Spatial Multiplexing transmits completely separate data streams on different
antennas (in the same channel) that are recombined to produce new 802.11ac data
rates. Previously used for 802.11n, the maximum number of streams for 802.11ac
has been increased to eight. 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 18. Spatial Multiplexing
The date rate increases directly with the number of transmit antennas used. Note
that mobile devices in the near future will support up to three or four streams at
most, with many supporting less.
MIMO (Multiple-In Multiple-Out)
MIMO (Multiple-In Multiple-Out) signal processing is one of the core
technologies of 802.11n and 802.11ac. 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. 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 (
). Multipath signals were considered to be interference by
M
Rx 1
Rx 2
Rx
M
M
Transmitter
Data Stream
Data Stream
Receiver
Tx 1
Tx 2
Tx
N
Содержание XR Series
Страница 1: ...August 11 2015 Release 7 5 Wireless Access Point User s Guide ...
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Страница 26: ...Wireless Access Point xxii List of Figures ...
Страница 54: ...Wireless Access Point 28 Introduction ...
Страница 120: ...Wireless Access Point 94 The Web Management Interface ...
Страница 186: ...Wireless Access Point 160 Viewing Status on the Wireless AP ...
Страница 434: ...Wireless Access Point 408 Configuring the Wireless AP ...
Страница 534: ...Wireless Access Point 508 The Command Line Interface Figure 227 Configuring Radio Assurance Mode Loopback Testing ...
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