Cell Phones :: essays research papers

Digital stall resound from Nokia Millions of citizenry in the unify States and around the world use mobile phoneular retrieves. They are such slap-up gadgets -- with a cell phone, you nates talk to anyone on the planet from ripe about anywhere These days, cell phones provide an incredible array of functions, and stark naked ones are being added at a breakneck pace. Depending on the cell-phone model, you can Store contact knowledge Make task or disruption lists Keep track of appointments and set reminders Use the built-in calculator for sincere math Send or receive e-mail Get information (news, entertainment, stock quotes) from the Internet Play simple games Integrate other devices such as PDAs, MP3 players and GPS receivers But have you ever wondered how a cell phone works? What makes it different from a regular phone? What do every(prenominal) those confusing terms like PCS, GSM, CDMA and TDMA mean? In this article, we will talk of the technology behind cell phones so that you can see how awing they really are. If you are thinking about buying a cell phone, be sure to check out How Buying a kiosk Phone Works to learn about everything you should know before reservation a purchase. Lets start with the basics In essence, a cell phone is a radio. One of the most interesting things about a cell phone is that it is actually a radio -- an extremely sophisticated radio, entirely a radio nonetheless. The telephone was invented by Alexander Graham gong in 1876, and wireless communication can trace its roots to the device of the radio by Nikolai Tesla in the 1880s (formally presented in 1894 by a young Italian named Guglielmo Marconi). It was only natural that these two great technologies would last be combined In the dark ages before cell phones, people who really needed mobile-communications ability installed radio telephones in their gondolas. In the radio-telephone system, there was one central antenna tower per city, and perhaps 25 bring a vailable on that tower. This central antenna meant that the phone in your car needed a powerful enthralter -- big copious to transmit 40 or 50 miles (about 70 km). It also meant that not galore(postnominal) people could use radio telephones -- there just were not enough channels. The genius of the cellular system is the division of a city into belittled cells. This allows extensive frequency reuse across a city, so that millions of people can use cell phones simultaneously.