What are the effects of Antenna Gain and Diversity Gain in GSM RF?

Question

At the high level I understand LTE nodes and signalling but want to learn in depth. I read one statement saying " MIB information is scrambled with antenna specific mask". Now I want to understand if an eNodeB supports multiple antennas (saying two antennas) , known as MIMO, then in that case, does an eNodeB sends MIB information into two different frequency spaces ? MIB is transmitted into subframe #0 of each radio frame.
Now I have doubt when we say MIB is scrambled with antenna specific mask before broadcasting and only middle 6 RBs are used to braodcast MIB, then in case of MIMO where multiple antennas are being used to send MIBs. Shall MIB from both the antennas overlap due to same 6 RBs or the same 6 RBs can be used to broadcast MIBs from both the antennas ?

Answer 1

Gain is most important thing in wireless communication and if its passive then it will be very useful here I write about antenna gain and diversity gain definition and its effect.

Antenna Gains:

Mobile Station Antenna:

• Portable mobile phones antennas have typically gain of 0 to 1 dBd.
• Car mounted antenna has a typical gain of 1 to 3 dBd.

Base Station Antenna:

• Omni directional antennas typically have a gain of 0-9dBd.
• Directional antennas typically have a gain of 9 to 14 dBd.

Diversity Gain:

• Diversity is used on the uplink to overcome deep fades due to multipath by combining multiple uncorrelated signals.
• Diversity antenna systems are used mostly at the BTS on the uplink.
• Diversity antenna system can be realised by physically separating two receive antenna in space or by using polarization diversity.
• Diversity gain should be considered in Link Budget Analysis whenever it is used.
• Typically a gain of 3dB is considered whenever diversity is used in the Uplink calculation.