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Space diversity -

Space diversity is designed for multi-antennas which are identical but placed at different co-ordinates. With this technique co-channel interference can be significantly reduced. The separation distance between the antennas are calculated based on expected channel conditions. An example of spatial diversity is Sectorization.

To improve reliability at receiver, multiple copies of a packet are transmitted over several antennas. If one of the packet gets corrupted at receiver, other packets are used to decode the useful data.

Different diversity coding's are  listed below

Space diversity
Transmit/Receive diversity
Pattern diversity
Polarization diversity

Antenna Diversity in wireless communication

Transmit or Receive diversity -

This is another multiple antenna technique employing multiple antennas at transmit and receive. This scheme employs the combination of antennas to achieve combinations of space-time diversities,or delay diversity or frequency diversity.

Space Time diversity coding (STC) -
This technique involves transmitting a given payload from different antennas (space diversity) and also at different times (time diversity).  

Delay Diversity -
Another form of STC, where a payload is transmitted with mathematically calculated delays from multiple antennas.

Frequency Diversity -   
In Frequency diversity a given payload is transmitted over different frequencies.

Pattern Diversity -

Pattern diversity consists of two or more antennas separated with a small distance configured to transmit different radiation patterns. When combined it can achieve improved gain performances.  

Polarization diversity -

This technique deploys the phenomenon of Polarization among antennas. Polarization is not good for signal quality and a 90 degree polarized signal reduces the signal strength by 34 dB. In order to offset the effects of polarization a pairing of two complementary antennas are implemented to offset the distortions on signal quality.  

Evolved Packet Core (EPC) system architecture for all IP.Mobility Management Entity (MME),
Serving System (S) Architecture (A) Evolution (E) Gateway or Serving Gateway SGW.
Packet Data Network (PDN) SAE Gateway
Enhanced Packet Data Gateway (ePDG)
Multiple antenna techniques - MIMO, Adaptive antenna systems - AAS and Antenna diversity

LTE topics

What is LTE? Key driving factors behind 4G technology.
LTE Data rates and comparison with 3G rates.
Difference between air, radio and core network..  
Seamless mobility

LTE cells, network. LTE cell search, cell identities & sync signals (primary and secondary).  2X2 MIMO, DL MIMO frame format 2x2, UL MIMO frame format 2x2. 4G LTE differences in FDD and TDD modes.
UMTS LTE Reference Signals. DMRS pilot demodulation

Cloud Computing ?
Whenever a document or photo is uploaded on the web, a thread of cloud computing is active. Learn more from here.