05-05-2012, 10:47 AM
The Early Development and Impact of 4G Technology Jane Sherman
Shannon Sword
[attachment=21329]
Previous Technology –1G “First Generation”
•Analog
–Continuous in amplitude and time
–Variations in the signal –disrupts over long distances
•Simplest type to wireless data
•Average between 4,800 to 9,600 bps (bits per second)
Previous Technology –2G
•Advantages
–Digital –consists of 1s and 0s
•Digital signal: 1) Low level, 2) High level, 3) Rising edge, and 4) Falling edge
Previous Technology –2G
–Allows for lower powered radio signals that require less battery power–CODEC introduction -program that encodes and decodes digital data stream or signal•Translates data from digital to analog and vice versavoiceCODEC10111001speaker
Previous Technology -3G
•CDMA –Code Division Multiple Access
–Form of multiplexing
–Does not divide up the channel by timeor frequency
–Encodes data with a special code associated with each channel
Reasons for New Research
•Government are forced to support to the financially troubled operators
•3G phones are expensive
•Lack of 2G mobile user buy-in for 3G wireless service
•Lack of coverage because it is still a new service–i.e. Champaign-Urbana uses 2.5G–Chicago is 3G equipped
Shannon Sword
[attachment=21329]
Previous Technology –1G “First Generation”
•Analog
–Continuous in amplitude and time
–Variations in the signal –disrupts over long distances
•Simplest type to wireless data
•Average between 4,800 to 9,600 bps (bits per second)
Previous Technology –2G
•Advantages
–Digital –consists of 1s and 0s
•Digital signal: 1) Low level, 2) High level, 3) Rising edge, and 4) Falling edge
Previous Technology –2G
–Allows for lower powered radio signals that require less battery power–CODEC introduction -program that encodes and decodes digital data stream or signal•Translates data from digital to analog and vice versavoiceCODEC10111001speaker
Previous Technology -3G
•CDMA –Code Division Multiple Access
–Form of multiplexing
–Does not divide up the channel by timeor frequency
–Encodes data with a special code associated with each channel
Reasons for New Research
•Government are forced to support to the financially troubled operators
•3G phones are expensive
•Lack of 2G mobile user buy-in for 3G wireless service
•Lack of coverage because it is still a new service–i.e. Champaign-Urbana uses 2.5G–Chicago is 3G equipped