Wireless Communication

Before I cover detailed cellular network in my forthcoming blogs, I plan to cover wireless communication paradigm in short. As the name indicates, wireless communication, it clearly means the communication without the “wire”. The wireless communication has potential to provide high speed, high quality information exchange between the devices which are positioned in distant places.

Types of Wireless communication:
1. Radio transmission
2. Microwave transmission
3. Infrared and millimeter waves
4. Lightwave transmission

The range of wireless systems:


Applications of wireless in different spheres of operations
1.Broadcasting service
2.Mobile communication of voice and data
3.Fixed service
4.Satellite
5.Other uses as military and scientific use.

Having said this, in the current blog we limit to Mobile communication and glance thru the various generation of mobile communication and their features.

Evolution of Mobile communication:

1G- First generation:

1.Mobile network launched in 1980s.
2.Analogue in nature
3.Used for voice call only.
4.Analogue Modulation, mostly FM
5.FDMA/FDD multiple access (the system was a multiple access one, because a second caller could use the same channel, once the first caller had hung up. Such a system is called "frequency division multiple access" (FDMA).)
6.Examples AMPS

2G-Second generation:

2G - Second Generation mobile telephone networks were the logical next stage in the development of wireless systems after 1G, and they introduced for the first time a mobile phone system that used purely digital technology.
1.Developed for voice communication
2.Digital system, Digital modulation
3.TDMA/FDD and CDMA/FDD multiple access
4.Example: one of the successful 2G digital systems is GSM.
•TDMA/FDMA
•900 MHz and 1800 MHz band
5.IS-95
•CDMA

3G-Third generation:

3G – Third Generation mobile telephone networks are the latest stage in the development of wireless communications technology. This support much higher data transmission rates and offer increased capacity, which makes them suitable for high-speed data applications as well as for the voice calls.
1.Digital Modulation
2.The main 3G technologies include UMTS (Universal mobile telecommunication service) with WCDMA and cdma2000.
3.Support data service as multi-megabits mobile internet access and multimedia application.
4.Features as TV Streaming, video conferencing, web browsing, email, paging, fax.