Following figure shows the simplified general view of wireless telephone technologies
Journey of Wireless mobile technologies started with 2G in 1980s ( we are not interested in 1G which was using analog telecommunications standards like AMPS in North America, TACS, NMT etc in other regions and before 1G breakthroughs.)
We have introduced with GPRS in the beginning of 2000's and few years later EDGE popped up.
After 2003, we have met with CDMA based 3G networks. And now( not exactly but not so much time occured by the way) our new buddy is LTE.
Above picture indicates the radio
interface multiplexing enhancement. LTE is using OFDMA for dowlink and SC-FDMA for uplink.
OFDMA simply provides;Spectral efficiency
Resistance to multipath interface
MIMO
The multiple input, multiple output antenna or better known as the Mimo antenna technology uses multiple radios to transfer more data at the same time and it is really very important innovation.
All-IP Based Network Architecture
The above figure shows gateway solution, offers one device including MME and Serving/PDN Gateway in one place. This is great enhancement for operators. So that, they will be able to update their network without paying huge money. This upgrade provides also higher network performance, efficient IP routing and latency reducing.
All-IP, Simplier, Flatter Network = Reduced OPEX & CAPEX
This improves the quality of experience, so let's imagine, it will give us better satisfaction for real time applications of communication like VoiP.
As a result,
LTE
will have a large impact on application performance
and network capacity
LTE
can be introduced in a progressive, scalable, and
cost effective way
REFERENCES
http://en.wikipedia.org/wiki
http://www.3gpp.org/LTE
http://nortel.com
http://www.mobileisgood.com/ofdm.php
http://www.intel.com/support/wireless/sb/cs-025345.htm
http://www.wildcatalliance.org/the-mimo-antenna-and-its-pros.htm
http://www.digikey.com/us/en/techzone/wireless/resources/articles/wireless-mimo-driving-rf-challenges.html
http://www.iphase.com/products/lte_about.cfm
http://gsmcommunications.blogspot.com/2011_04_01_archive.html
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