ZTE announced a breakthrough in its development of D-MIMO (distributed multiple input and multiple output) technology, which promises up to a 9X increase in wireless network performance at the cell edge.
In mobile networks with many base stations, interference can cause degraded signaling at the cell edge, affecting user experience. 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.
ZTE said a recent outdoor field test conducted jointly with a partner used D-MIMO technology based on ZTE’s proprietary Cloud Radio solution. The testing 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 technology used in ZTE’s new D-MIMO 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, 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 multi-user joint transmission (MU-JT).
The indoor D-MIMO test result shows that the MU-JT technology can form null steering toward multiple users to guarantee good multi-user joint transmission in an enclosed and small space. The service data rate of a single testing cell has been at least quadrupled in an ideal non-interference situation, and a number of testing cells have enhanced their resistance to interference by more than a hundred times.
http://wwwen.zte.com.cn/en/press_center/news/201511/t20151112_445840.html
