LANCOM L
-
300 Access Point series
Chapter 5: Advanced wireless LAN configuration
58
EN
The spatial multiplexing function allows several separate data streams to
be transmitted over separate antennas in order to increase data through-
put. When using external antennas, please observe that the number of
spatial streams can be transmitted by the antenna system (e.g. two with
polarization-diversity antennas and one with normal outdoor antennas
with a single antenna connector).
With the 'Auto' setting all spatial streams that are supported by the
wireless LAN module in question are used.
Modulation Coding Scheme (MCS)
A specific MCS number denotes a unique combination from the modula-
tion of the individual carriers (BPSK, QPSK, 16QAM, 64QAM), coding rate
(i. e. proportion of error correction bits in the raw data and number of
spatial streams. 802.11n uses this term instead of the term "data rate"
used in older wireless LAN standards because data rate is no longer an
unequivocal description.
MCS index
Data streams
Modulation
Coding rate
Data throughput
(GI=0.4 μs, 40 MHz)
0
1
BPSK
1/2
15
1
1
QPSK
1/2
30
2
1
QPSK
3/4
45
3
1
16QAM
1/2
60
4
1
16QAM
3/4
90
5
1
64QAM
1/2
120
6
1
64QAM
3/4
135
7
1
64QAM
5/6
150
8
2
BPSK
1/2
30
9
2
QPSK
1/2
60
10
2
QPSK
3/4
90
11
2
16QAM
1/2
120
12
2
16QAM
3/4
180
13
2
64QAM
1/2
240
14
2
64QAM
3/4
270
15
2
64QAM
5/6
300
