‘Radio Communication and the Mobile Phone’ By Oliver Clegg
What is a radio wave? Radio waves are a type of electromagnetic radiation. Radio waves have the longest wave length on the electromagnetic spectrum. This type electromagnetic wave can receive or send signals to and from radio stations and mobile phones. A mobile phone services operate within this range of frequencies; 872-960 MHz, 1710-1875 MHz and 1920 - 2170 MHz
How does radio communication work? Radio communication is also known as “carrier wave”, the frequency for the carrier wave will usually be transmitted as a “sine wave”. A sine wave has very little information transmitted since it goes on repeat, this wave was used in the early process of Morse code. For the radio wave to carry more information such as speech there needs to be a carrier wave added, which is a process known as modulation.
Mobile Phone Networks: Base Station and handsets Mobile phones having the ability transfer voice, images and computer text to another cellular mobile device. Radio frequency signals transmit to mobile phones from the nearest baseline and receiving radio signals are sent to a baseline and then to your mobile phone. For stationary phones the baseline is connected to the main telephone network in the area, but for cellular phones the baseline can be connected to different telephone lines.
How does a 'Cellular' Radio work? Every base station provides radio coverage to each geographical area known as a cell, which are connected to one another by central switching centres, which helps mobile phones track calls and then transfer them to the caller. The size of the cell vary depending upon these three factors; the local terrain, the network the mobile phone is connected to and the capacity of how many call can be made at one time
Why are there so many base stations required? The reason for using many base stations is so that the cellular devices (mobile phones) need a minimum signal so that reception of calls are clear and have no distortions. By having more than one base station in an area will improve the quality of the reception on a mobile phone voice message. Since there are radio station signals as well as mobile phones the amount of calls at one time would reduce by a lot if there was only base station in the area.
Types of Mobile Phone Technology: GSM There are three cellular radio networks in the UK; 900 MHz, 1800 MHz and 2.2 GHz. Global system for Mobile Communications or GroupeSpeciale Mobile. This is the pan-european standard operating system for the celluar mobile phones, which uses 900Mhz and 1800Mhz frequencies.
Universal Mobile Telecommunication System This operating system for cellular mobile phones is the most advanced system with a frequency of 2Ghz, which also allows video messaging via mobile phones. Types of Mobile Phone Technology: UMTS