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Lancom L-320agn Wireless Manual

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LANCOM L-32x Access Point series
Chapter 1: Introduction
16
EN
antennas. In order to transmit two data streams in parallel, special antennas
are employed that use polarization channels turned through 90° to each
other. These so-called "dual-slant" antennas are really two antennas in one
housing. Since a third signal does not offer additional reliability, outdoor
applications generally use as many antennas (or polarization channels) as
there are data streams for transmission.
40 MHz channels
As the above explanation of OFDM modulation states, data throughput rises
with an increasing number of carrier signals because this allows several sig-
nals to be transmitted simultaneously. If a channel with a bandwidth of
20 MHz supports no more than 48 (802.11a/g) or 52 (802.11n) carrier signals,
the obvious choice would be to use a second channel with additional carrier
signals.
This method was used in the past by a number of manufacturers (including
LANCOM Systems) and was referred to as "turbo mode", allowing data rates
of up to 108 Mbps. Turbo mode does not form part of the official IEEE stan-
dard but is frequently employed on point-to-point connections, for example,
because compatibility to other manufacturers tends to play a secondary role.
However, the success of the underlying technology has lead to its incorpora-
tion into 802.11n. IEEE 802.11n uses the second transmission channel in a
way that maintains compatibility to IEEE 802.11a/g devices. 802.11n trans-
mits data over two contiguous channels. One of these assumes the task of a
control channel that, among other things, handles the administration of data
transmission. Concentrating these basic tasks into the control channel means
that devices supporting a transmission at 20 MHz only can also be connected.
The second channel is an extension that only comes comes into effect if the
remote client also supports data transmission at 40 MHz. The use of the
MIMO AP 802.11n
POLARIZATION
DIVERSITY
Building
MIMO AP 802.11n
POLARIZATION
DIVERSITY
Building
… 17 …


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