NEC demonstrates advantages of distributed-MIMO in ultra-high-density user environments
NEC Corporation has conducted verification
tests to evaluate the performance of massive-MIMO (mMIMO) utilizing the 28GHz band. During these tests,
NEC verified mMIMO’s ability to reliably provide large-capacity transmission in
environments with extremely high user densities of 4 to 8 users per square
meter, such as stadiums and crowded urban areas. Moreover, the tests
demonstrated that distributed-MIMO configurations can maintain better data transmission than
conventional collocated-MIMO configurations.
mMIMO mobile access base stations enable multiple simultaneous user
connections and achieve higher cell capacity with a combination of spatial,
time division and frequency division multiplexing. Using a 28GHz-band prototype
device (*4), NEC quantitatively compared users’ signal-to-noise ratio (SNR) in
both distributed-MIMO and collocated-MIMO using a newly developed index for
this demonstration.
The SNR of spatial multiplexing in mMIMO is influenced by the amount of leaked
power from beams to other users in the same cell. However, in comparison to
collocated-MIMO configurations, NEC confirmed that distributed-MIMO could
maintain SNR independent of user density depending on the sharpness and level of
orthogonality of the beams.
Going forward, in line with the advancement of 5G and the development of 6G,
NEC will continue to develop technologies aimed at even higher speeds, larger
capacities, and greater cost efficiency.
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