MIMO-OFDM is being
used in many
of the communication
technologies like WiMAX,
WLAN etc. because
it has numerous
advantages over previous
techniques. Following are
the advantages of
MIMO-OFDM: [19]
·
ROBUSTNESS:
The major advantage
of MIMO-OFDM is its nature
of robustness again
the multipath propagation.
And that is
a very good
factor to be
implemented in a
wireless systems for
a better data
communication.
·
CYCLIC PREFIX:
The
main of the
MIMO-OFDM introduction is
cyclic prefix, it
make the systems
more resistance able
towards the time
dispersion. Cyclic prefix
help system to
overcome the problem
of Inter-Symbol Interference (ISI). It is just
replicable for guard
band for the
multipath propagation.
·
ACCOMPLISHING:
There
are n numbers of
narrowband channels in a
MIMO-OFDM channels so
these Txs numbers
of channels are
easily accomplished as
compare to the Tx
number of channel.
This means it
is not affected
by the numbers
of channels.
·
HIGH BITRATE:
The benefit
of MIMO-OFDM can be notable
is its very
high transmission rate
as compare to the other
transmission technologies. This
is accomplished with
the help of
closely spaced multiple
channels.
·
NO WASTING OF
DATA:
The
one of the
advantages of the
MIMO-OFDM is if
the data stream
are affected by
fading then that
faded data stream
can be deleted
to save to
rest of data.
1.1 DISADVANTAGES OF MIMO-OFDM:
As there are
some benefits of MIMO-OFDM there
are also some
drawbacks or disadvantages
of MIMO-OFDM which are.[19]
·
HIGH POWER RATE:
In MIMO-OFDM
the high peak to the average
power ratio is
required which is
the major of
the drawback of
MIMO-OFDM. As it
will consume a lot of energy
to be used
in the system.
·
HIGH
SYNCHRONIZATION ACCURACY:
In MIMO-OGDM
the main point
is synchronization of
orthogonal signals if it is
not synchronized then
it can destroy
the whole signal,
which cause the
interference in the
signal. Phase noise
error or the
presence of Doppler
effect can cause
the degradation to
the MIMO-OFDM system.
·
MULTIPATH
PROPAGATION:
In MIMO-OFDM
it is affected
by the multipath
propagation so it
is must effect
the data stream
transmission at both
ends. And it
affects alots.