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Sequans
Boosts Mobile WiMAX Network and Device Performance With Uplink MIMO
Other Topics: WiMAX Operators
Sequans Communications
June 2, 2008
WIMAX EXPO
Booth C2-2
Operator infrastructure costs reduced by up to 50 percent
Taipei, Taiwan -- Sequans Communications,
the leading WiMAX chipmaker, is enabling the second transmitter in its
mobile station semiconductor products to boost Mobile WiMAX™ system
performance. As the only WIMAX chipmaker providing two transmitters in
its complete mobile device product line, Sequans is able to apply MIMO
techniques in the uplink in addition to the downlink. |
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"The benefits of uplink MIMO cannot be
ignored," said Georges Karam, Sequans CEO. "WIMAX network operators’
recent experiences show that, as in other wireless networks, coverage is
limited by the uplink. With the diversity introduced by uplink MIMO, up
to a 50 percent reduction in infrastructure costs can be achieved with
very little incremental cost to the mobile device and no incremental
cost at the base station."
Through the use of a novel technique called “tile switched diversity”
(TSD), Sequans can bring the benefits of uplink MIMO to any Mobile WIMAX
network, regardless of the base station used. Further gains can be
achieved if an uplink MIMO receiver is implemented at the base station.
Benefits of Uplink MIMO
The benefits of uplink MIMO can be applied either to extend the cell
coverage or reduce the power consumption and cost of the mobile device.
Extended Cell Coverage Reduces Cost of Infrastructure
With uplink MIMO, the resultant diversity and combining gains can nearly
double the cell coverage area and hence reduce network infrastructure
costs by up to 50 percent.
Lower Power Consumption Reduces Cost of Devices
Alternatively, uplink MIMO allows the replacement of a single
transmitter and its higher output power amplifier with a dual
transmitter and two 5 or 6 dB lower output power amplifiers,
significantly reducing the total power consumption of the device--a key
objective in the manufacture of mobile devices. For example, in fixed
gateways and modems, replacement of a single 28 dBm power amplifier with
two smaller 23 dBm power amplifiers reduces total power consumption of
the device by up to 750 mW, resolving thermal issues, eliminating the
need for heat sinks, and therefore lowering the overall cost of the
device.
"Uplink MIMO is pretty much a free benefit, squeezing the most
efficiency possible out of WiMAX networks with little to no incremental
cost,” added Karam. “Why would anyone not want to take advantage of it?"
Uplink MIMO is implemented in all of Sequans’ mobile WIMAX solutions,
including the SQN1130 baseband mobile station chip, the SQN1140 and
SQN1145 mobile station RF chips, the SQN1170 integrated
baseband/RF/SDRAM mobile station chip, and the SQN2130 baseband base
station chip. |
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