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Introduction
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MIMO (multiple input - multiple
output) technology increases the max.
achievable data rates in wireless
networks. The idea behind MIMO is to split
the data into multiple streams and to
transmit these streams parallel. This
parallel transmission leads obviously to
higher data rates at the receiver.
But the simple approach to add the data
rates of the multiple streams at the
receiver is not valid as the interference
between multiple streams differs
significantly from the interference
between multiple antennas (cells). Streams
may have different polarizations and can
be orthogonal which would eliminate the
interference between the streams.
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A radio network
planning tool considering MIMO technology
must therefore be able to determine the
interference between the MIMO streams based
on their individual polarizations, LOS/NLOS
conditions, etc.. Only if the interference
between the MIMO streams and between the
different cells is computed accurately, the
effective gain due to MIMO can be predicted.
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Support
of MIMO in WinProp
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WinProp supports MIMO during the network
planning. The user must define
- the MIMO mode (2x2, 2x4, 4x4, etc.)
- the antennas radiating the different
MIMO streams. For each antenna the user
has to define
- the location of the antenna
- the antenna pattern (radiation
pattern)
- the polarization of the antenna
Based on these settings, WinProp computes
the number of MIMO streams received at each
location in the prediction area. For each
MIMO stream the interference is determined
individually, based on
- LOS/NLOS conditions of the interferers
- polarization of the received signals
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Two MIMO
streams combined for data transmission
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The final data
rate, combining the different MIMO streams,
is determined and visualized in ProMan
together with the data rate received with each
MIMO stream.
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Application
note about MIMO in WinProp
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Presentation of
the company
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Read more about propagation
models
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Read
more about network planning
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Read
more about scientific publications related
to MIMO network planning
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Read
more about the MIMOWA project
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The MIMO
module is available as an add-on to
nearly all air
interfaces supported by WinProp.
This includes
- but is not limited to -
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For many years
AWE Communications has been working on
MIMO. The first steps towards MIMO were
made within the public funded project
MIMOWA.
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