Radio communication and the mobile phone’


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Radio communication and the mobile phone’

  1. 1. ‘Radio Communication and the Mobile Phone’<br />By Oliver Clegg<br />
  2. 2. What is a radio wave?<br />Radio waves are a type of electromagnetic radiation.<br />Radio waves have the longest wave length on the electromagnetic spectrum.<br />This type electromagnetic wave can receive or send signals to and from radio stations and mobile phones.<br />A mobile phone services operate within this range of frequencies; 872-960 MHz, 1710-1875 MHz and 1920 - 2170 MHz<br />
  3. 3. How does radio communication work?<br />Radio communication is also known as “carrier wave”, the frequency for the carrier wave will usually be transmitted as a “sine wave”.<br />A sine wave has very little information transmitted since it goes on repeat, this wave was used in the early process of Morse code.<br />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.<br />
  4. 4. Mobile Phone Networks: Base Station and handsets<br />Mobile phones having the ability transfer voice, images and computer text to another cellular mobile device.<br />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.<br />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.<br />
  5. 5. How does a 'Cellular' Radio work?<br /> 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.<br />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<br />
  6. 6. Why are there so many base stations required?<br />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.<br />By having more than one base station in an area will improve the quality of the reception on a mobile phone voice message.<br />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.<br />
  7. 7. Types of Mobile Phone Technology: GSM<br />There are three cellular radio networks in the UK; 900 MHz, 1800 MHz and 2.2 GHz.<br />Global system for Mobile Communications or GroupeSpeciale Mobile. <br />This is the pan-european standard operating system for the celluar mobile phones, which uses 900Mhz and 1800Mhz frequencies.<br />
  8. 8. Universal Mobile Telecommunication System <br />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.<br />Types of Mobile Phone Technology: UMTS <br />
  9. 9. Thank you for listening<br />