Telecommunications - Mobile Phones - Engineering Report

Topics: Mobile phone, IPhone, Cellular network Pages: 9 (2759 words) Published: November 27, 2012
Title: Engineering Assignment

Historical Development of the Mobile Phone

Author: J.Naumovski
Class:Year 11 Engineering

This Report will examine the Historical development of the mobile phone in telecommunications, such as the History, safety, Use in everyday life and the innovations.

Cell phones, commonly known as mobile phones or wireless phones, are hand-held phones with small built-in antennas that connect to bigger antennas at a cell tower. Unlike home phones, cell phones can be carried from place to place without the need to be plugged into a lan-line to make a call. This makes them a good choice for people who want to be in touch with other people even when they are away from the house. How Do Cell Phones Work people ask? Not many people know it, but cell phones are actually two-way radios similarly like the walkie-talkies from past decades, yet much more advanced. When you talk into your cell phone receiver, it registers your voice and converts the sound into radio waves. Without this you cannot hear the other person. These waves travel through the air until they reach a receiver, which is usually found at a base station. This station will then send your call through a telephone network until it contacts the person you wish to speak with. When someone places a call to your cell phone, the signal travels through the telephone network until it reaches the station closest or near you. The station sends the radio waves out into the neighboring areas; this will be the closest tower in your area. These radio waves are then picked up by your cell phone and converted into the sound of a human voice. Cell phones are a vast improvement over the telecommunications technology of the past, and are daily becoming a fixture of modern life. As always, communication is vital, and cell phones will help you to better communicate with the key people in your life. Using a cell phone is one of the first steps you must take to participate effectively in the emerging global economy.

The History of Mobile Phones
The history of mobile phones shows a deep understanding of Telecommunication and the development of devices which are connected wirelessly to a public switched telephone network. The transmission of speech by radio has a long and excessive history going back to Reginald Fessenden's invention and shore to ship demonstration of radio telephone, through the Second World War (WWII) with military use of radio telephone links. Hand held radio transceivers have been available since the 1940’s. Mobile telephones for automobiles became available from some telephone companies in the 1940’s also. Early devices were bulky and consumed high power and the network supported only a few simultaneous conversations. Modern cellular networks allow automatic and pervasive use of mobile phones for voice and data communications.

In the United States, engineers from Bell Labs began work on a system to allow mobile users to place and receive telephone calls from automobiles, leading to the inauguration of mobile service on June 17, 1946 in St. Louis, Missouri. Shortly after, AT&T offered Mobile Telephone Service. A wide range of mostly incompatible mobile telephone services offered limited coverage area and only a few available channels in urban areas. The introduction of cellular technology, which allowed re-use of frequencies many times in small adjacent areas covered by relatively low powered transmitters, made widespread adoption of mobile telephones economically feasible.

The advances in mobile telephone can be traced in successive generations from the early "0G" services like MTS and its successor Improved Mobile Telephone Service, to first generation (1G) analogue cellular network, second generation (2G) digital cellular networks, and third generation (3G) broadband data services to the current state of the art, fourth generation (4G) native IP...

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