MIMO
Post-Processing
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Besides the channel characteristics
obtained by ray-optical wave propagation, MIMO systems can be evaluated
in more detail by calculating further MIMO specific parameters such as
the channel matrix or the MIMO channel capacity.
The additional MIMO channel data can be determined by
post-processing the ray data simulation output of the WinProp
prediction tool ProMan by
calculating the phase differences between the single antenna elements
of the
MIMO antenna arrays at the transmitter and at the receiver.
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Consideration of arbitrary antenna arrays
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The MIMO antenna
arrays at the transmitter as well as at the receiver can be modeled as
uniform linear arrays or as circular antenna arrays. For the linear
array arbitrary spacings and azimuth
adjustments can be selected for each individual antenna element. The
antenna spacings for the circular array are determined automatically,
depending on the number of elements which are equally distributed over
the circle. Each antenna element can be modeled individually with an
antenna pattern, azimuth and tilt.
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Uniform linear antenna array
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Circular antenna array
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MIMO
Channel Matrix
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The MIMO
channel matrix describes the radio channel between each transmit and
each receive antenna of the multi-antenna system. There
is a complex single-input-single-output
(SISO) channel impulse response between every transmit antenna m and
every receive antenna n of a MIMO
system. The linear time-variant
MIMO channel is
represented by the channel matrix with dimension n x m
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MIMO Channel Capacity
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As multiple-input multiple-output systems have emerged as
one of the most promising approaches for enabling high data
rates, the channel capacity is another interesting parameter of a MIMO
system. The system can be
normalized to compare different MIMO channels either based on the same
signal-to-noise-ratio or based on the same path loss.
Read more about the MIMO post-processing options in the MIMO
Application Note.
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