WHITE PAPER
MIMO: MULTIPLE RADIO
TECHNOLOGIES
ADDING PERFORMANCE AND STABILITY TO WIRELESS
COMMUNICATIONS
Critical infrastructure
networks require
stability and reliability
under any conditions
technology can result in a profound savings
in your network roll-out costs as well as your
ongoing operational expenditure.
MIMO (Multiple Input Multiple Output) is
Multiple radio technologies (aka MIMO)
where a wireless system is fitted with two
along with advanced signal processing
radio transmitters and two radio receivers
and specialized software can provide stable
at each end, offering two benefits:
wireless links under the most challenging
environments. Redline has spared no expense
in developing the most advanced MIMO systems
which deliver the highest stable data throughput
at the longest range under any conditions. This
means that your investment yields more data
capacity, over a greater service area, than any
other multipoint system available today.
Redline’s investment in advanced MIMO radio
POWERFUL. VERSATILE. RELIABLE.
§§ MIMO-A (Diversity): The transmitting
device sends duplicate copies of the same
data through the two radios. The receiving
device then chooses and processes the
best symbol for each bit of data. MIMO-A
diversity provides better signal quality for
improved air link performance, even in
challenging wireless environments.
§§ MIMO-B (Multiple Streams): When radio signal is
very good (because you are close to the base
Better Signal
Higher Speed
MIMO-A
MIMO-B
over each transmitter, thus doubling its data speed
over the same radio channel.
Redline uses Smart MIMO Switching to enable MIMO-A
or MIMO-B on a remote-by-remote, and packet-bypacket basis, automatically, as conditions require. This
Base Staion
radio system can send DIFFERENT data streams
Base Staion
station, have perfect line-of-sight, or both) a dual-
Diversity:
MRC
MRRC
STBC
Spatial
Multiplexing
Multiple
Streams
Remotes
increases the efficiency of each link and provides for
increased link stability and improved data capacity.
MIMO-A DIVERSITY TECHNIQUES
MRRC: Maximal Ratio Receiver Combining
§§ Radio wave sampled for
deviations
MRRC
§§ Done on chip for each symbol
received
~4dB gain
§§ Best received wave is selected
§§ 133% increase in signal strength (~4dB)
STBC: Space Time Block Coding
§§ Data coming into the radio is divided in blocks
§§ Blocks are put in different
order and transmitted
§§ Redundancy is created in
space and in time
STBC
~8dB gain
DATA PACKET
4
DATA PACKET
3
2
1
§§ Blocks are rearranged in their
original order
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WIRELESS CHALLENGES THAT MIMO-A DIVERSITY RESOLVES
Reflections:
Inversion:
Radio signal is
Heavy rain, beach
reflected off
crossings, or melting
obstructions. Multiple
snow result in signal
signals of same
reflections at inverse
transmission confuse
phase. Radio wave is
receiver. Solution:
effectively cancelled.
Reflections actually
Solution: MIMO’s
enhance MIMO dual radio architecture
X-POL prevents full inversion; MRRC & STBC
performance.
compensate for partial inversion dB loss.
Scatter:
Ducting:
Radio signal is
Calm, warm water
fragmented over
induces high
sharp edges.
evaporation. Cool
Different parts of the
morning air lifts
transmission is
humidity into
received at different
atmosphere rapidly.
times at different
Signal is severely
power levels. Solution: MIMO’s STBC
faded. Solution: MRRC & STBC compensate
guarantees correct packet order of packets
for much dB loss due to ducting. Dual-
and fragments.
frequency operation solves ducting completely.
REDLINE AND MIMO-A
Redline’s RDL-3000 solution implements MRRC
and STBC at the base station and remote device.
RDL-3000 is the only solution to use dual radio
transmitters in the remote device which allows
full bi-directional MIMO-A diversity. This provides
a balanced and stable air link, but also provides
for full uplink data speeds for uplink-intensive
applications, such as video surveillance.
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Redline Communications has enabled the
weather. Redline’s dual-radio MIMO-A and
RDL-3000 with MIMO-A technologies unlike
MIMO-B technology has been field proven in
any other multipoint wireless system available
the harshest, most challenging deployments
today. Systems that only implement MIMO-B,
in industrial IP networks all over the world.
or only offer MIMO-A in the base station do
not realize the true benefits of this powerful
technology. The dual MIMO capabilities of the
Less Expensive to Deploy
RDL-3000 system give it far superior range
and data capacity. This means that fewer
§§ Larger coverage area from base station
base station towers need to be installed to
§§ Use lower masts and smaller antennas
cover a given area — communication tower
construction is the single highest CAPEX
§§ More data capacity for more remotes
item in the deployment of a multipoint
wireless system. MIMO-A allows remotes
to be installed with smaller, less expensive,
Less Expensive to Operate
antennas and without perfect line of sight, so
smaller, less expensive, masts can be used.
§§ More stable and reliable air links
But these MIMO technologies also provide
§§ No signal degradation during bad weather
network operational savings because their
stable and reliable air links do not require
§§ Not effected by plant growth around antenna
maintenance for foliage growth or loss of
communications productivity during inclement
ABOUT REDLINE COMMUNICATIONS
Redline Communications is the creator of powerful wide-area wireless networks for the world’s most
challenging applications and locations. Used by Oil & Gas companies, militaries, municipalities and
telecom service providers, Redline’s powerful and versatile networks securely and reliably deliver voice,
data, M2M and video communications for mission-critical applications.
302 Town Centre Blvd.
Toronto, ON L3R 0E8 Canada
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t +1.905.479.8344
e [email protected] tf +1.866.633.6669
20160118 WP-MIMO© 2016 Redline Communications Inc. All rights reserved.
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