More than 4x4 MIMO in LTE or 5G in a UE (Mobile or Modem)?

4G LTE
,
1

Hello Experts,
The latest Qualcomm X55 chipset for 5G supports 2x2 for mmWave and 4x4 for sub-6Ghz
Have anyone seen more than 4x4 MIMO in LTE or 5G in a UE (Mobile or Modem)?

2

Samsung has AAU with 8x8 DL MIMO capability but there are no UEs for this.
This is normal because 4x4 DL MIMO in a drivetest is less than 5%.
8x8 DL MIMO would be less than 1%, it doesn"t worth investment effort.

3

Indeed, even 4x4 for mmWave would be complex, 8x8 in any form may be an overkill and shall be efficient in case of stationary devices.

4

That’s the max we have also seen yet.

5

In indoor stats depending on TX antenna separation (sometimes more than 10 meters between antennas) rank 4 can be seen up to 90% of the time.
So is useful in indoor 4x4 DL MIMO with indoor coverage.

6

8x8 require min 8 antennas in UE side right, and no UE have more than 4 I think as of now.
But not sure of FWA modems.
Maybe they have 8 antennas.

7

As I know, currently no commercial UE support more than 4x4 MIMO.
Huawei has TUE ( test equipment ) which can support 8x8 MIMO, with customized 8 antenna and baseband module, for testing SU-MIMO 8 layers in 5G.

1 Like