@AkashDev I too realised the fact after I bought these LPDAs. They definitely will catch the signal so you will always have a good RSRP. But for data speeds to increase you need a Cross polarized antenna that will improve your RSRQ and hence your SINR improves. I gave up with these LPDAs and brough a MIMO Panel (9 dbi max gain ) which was enough to catch a signal from a distance of 600-700 meters. I get good RSRQ and SINR .attached is the pic of my MIMO Antenna mounted at a height of 40 meters above the ground facing the tower.​​​​​​ 

Some people are getting good Quality (RSRQ) and SINR even they have or haven't these LPDAs installed.because

 they must be staying very close to BTS with very clear LoS , there must be no blocking objects or building etc come in between. And they are placed in the tower's sector antenna beam forming region.,they must be at an higher altitude than others. There must be no other cell near by to cause same channel interference , on the other hand they are using these high gain LPDA thus reducing the interference and get good SINR.

The above factors are also equally be considered for getting best LTE Speeds.

@AkashDev again all these LTE parameters we receive are case to case basis. Not everyone will have good values or all have bad. It depends on several factors as mentioned already the factors. Towers are heavily loaded these days due to increased demand of the cellular data, the speed capping is a wild guess by all  after we test  our CPE during a time non-peak hours where almost no user latched to it.

Yes I got a bump in speeds by an average of 10 Mbps by  replacing the LPDAs with the panel mimo,gave the patch panel 10 meters of more height just to ensure no restrictions.

Amazon india doesn't sell a panel MIMO. All those are wall mounted SISO that are getting sold there.

For knowing the speed cap please write to telecom service provider or contact the netwok optimization officer of your area for that service provider.

As far I know roughly 2CA max at 50-100 Mbps to 4G towers at least in India but have seen people using at 160-200 Mbps abroad 2x2 MIMO or 4x4 MIMO.

The speeds each can get is controlled either by the RAB (Radio Access Bearer) decided on whether the carrier wants to throttle people at the eNodeB (most efficient) or on the  data core backbone.

Hope it helps.