|
 ZTE Corporation announced the completion of what it claims
is the world’s first pre-commercial test of distributed MIMO (D-MIMO)
technology. The field test, conducted jointly by ZTE and a partner,
demonstrated up to nine-time increase in data rate at the cell edge through the
use of D-MIMO technology based on ZTE’s proprietary Cloud Radio solution. The
outdoor part of the test covered single-user and multiple-user scenarios in an
environment with multiple overlapping base stations and used commercially
available mobile device terminals.
The coherent-joint transmission (JT) technology used in
ZTE’s new DMIMO system ensures full-phase synchronization among base stations
so that the jointly transmitted signal is amplified to the maximum level as it
arrives at the antenna of a user terminal, minimizing interference with other
terminals. Compared with the legacy non-coherent-JT technology, ZTE reported
that coherent-JT provides 3 dB of additional gain at the antenna of a target
user terminal and forms null steering at the antennas of other user terminals
to minimize signal interference, achieving MU-JT.
The D-MIMO technology can effectively improve the data rate
at the cell edge through coordinated transmission among base stations,
resolving a major challenge facing operators. The indoor D-MIMO test result
showed that the MU-JT technology can form null steering towards multiple users
to guarantee good multiuser joint transmission in an enclosed and small space.
The company said that the service data rate of a single testing cell was at
least quadrupled in an ideal noninterference situation, and a number of testing
cells have enhanced their resistance to interference by more than a hundred
times.
Read the full article: IEEE Vehicular Technology Magazine, Volume 11, Number 1, March
2016 | 
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