Bluetooth & Wifi

Bluetooth

·         Bluetooth technology allows various different kinds of electronic equipment to communicate with each other wirelessly. This is what allows your cell phone to communicate with your wireless headset, or your smart phone to link to your laptop to download your address book.

WiFi

·         WiFi is a networking technology that allows your computers to communicate with each other, or with the Internet. This communication goes through a wireless router, which then sends a signal out to where it needs to go.

 

The main difference between the two technologies is that Bluetooth devices communicate one-on-one with each other, whereas WiFi devices communicate with any other device through a wireless router.

Bluetooth is generally used for transmitting audio, such as from your cell phone to your wireless earpiece. WiFi is generally used for transmitting Internet signals from your cable or DSL modem to and from your computer.

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Global Positioning System & Satellite navigation System

The Global Positioning System (GPS) is a space-based satellite navigation system that provides location and time information in all weather, anywhere on or near the Earth, where there is an unobstructed line of sight to four or more GPS satellites. It is maintained by the United States government and is freely accessible to anyone with a GPS receiver.

The GPS program provides critical capabilities to military, civil and commercial users around the world. In addition, GPS is the backbone for modernizing the global air traffic system.

A satellite navigation or SAT NAV system is a system of satellites that provide autonomous geo-spatial positioning with global coverage. It allows small electronic receivers to determine their location (longitude, latitude, and altitude) to within a few metres using time signals transmitted along a line-of-sight by radio from satellites. Receivers calculate the precise time as well as position, which can be used as a reference for scientific experiments. A satellite navigation system with global coverage may be termed a global navigation satellite system or GNSS

all about mobile phones!!

Mobile phones have changed the way we live our lives and to many, the prospect of a world withoutvoice calling, text messaging and mobile Internetaccess is an unsettling one. As we all know, mobile phones didn’t just happen overnight. They grew up, just like us.Mobile phones evolved over five different generations, the latest of which is still being rolled out and adopted by consumers. Don’t worry – by the time most of us will have switched to 4G there will undoubtedly be yet another standard to aspire to.

The developement of mobile phones has become so fast that it is difficult to keep up with it. If we look back at how it looked like in the past and where it is nowadays it is incredible to see how it has changed. With all their benefits they have become an irreplacible parts of our lives.
A mobile phone (also known as a cellular phone, cell phone and a hand phone) is a device which can make and receive telephone calls over a radio link whilst moving around a wide geographic area. It does so by connecting to a cellular network provided by a mobile network operator. The calls are to and from the public telephone network which includes other mobiles and fixed-line phones across the world. By contrast, a cordless telephone is used only within the short range of a single, private base station. [1]
The history of mobile phones charts the development of devices which connect wirelessly to the public switched telephone network. Early devices were bulky and consumed high power and the network supported only a few simultaneous conversations. Modern cellular networks and microprocessor control systems allow automatic and pervasive use of mobile phones for voice and data communications. [2]