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 />A Wonderful Presentation by Gareth Dakin<br />
    2. 2. Radio communication<br /><ul><li>A little over a hundred years since Marconi’s first transmission , 60% of the UK enjoy the benefits of mobile phone use.</li></li></ul><li>Radio Waves<br /><ul><li>Mobile phones transmit and receive signals using electromagnetic waves or radio waves
    3. 3. Electromagnetic radiation consists of oscillating electric, magnetic fields and the frequency</li></li></ul><li>Frequency<br /><ul><li>Frequency is the number of times per second at which the wave oscillates
    4. 4. This is measured in Hertz (Hz)
    5. 5. Between 30 kHz and 300 GHz is what’s used for telecommunications including radio </li></li></ul><li>Frequency<br /><ul><li>The UK AM radio uses frequencies between 180 kHz and </li></ul>1.6 MHz<br /><ul><li>Mobile frequency range is between 872-960 MHz, 1710-1872 MHz and 1920-2170 MHz</li></li></ul><li>Radio Communication using amplitude modulation<br /><ul><li>Radio frequency wave used for radio communication is known as a carrier wave
    6. 6. The carrier wave is produced by the transmitter as a sine wave
    7. 7. For the radio wave to convey information such as speech information needs to be added to the carrier wave, this is modulation</li></li></ul><li>Radio Communication using amplitude modulation<br /><ul><li>For amplitude modulation electrical signals from a microphone is used to vary the amplitude of the carrier wave
    8. 8. At any instant the amplitude of the carrier wave is made proportional to the size of the electrical modulating signal
    9. 9. There are many types of modulating techniques with different characteristics for different applications</li></li></ul><li>Mobile phone networks using radio communication<br /><ul><li>A mobile phone sends and receives information via radio communication
    10. 10. Radio frequency signals are transmitted from the phone to the nearest base station
    11. 11. Incoming signals are sent from the base station to the phone at a slightly different frequency
    12. 12. Base stations link mobile phones to the rest of the network</li></li></ul><li>Mobile phone networks using radio communication<br /><ul><li>Signals are transmitted to the network via telephone cables or higher frequency radio links between an antenna
    13. 13. Each base station provides radio coverage to a geographical area known as a cell </li></li></ul><li>Bibliography<br />Geo Tau Aisay (2009) Radio waves [Online image]. Available from: [24/01/11]<br />Hardware sphere (2010) Nokia to charge phone via radio waves [Online image]. Available from: [24/01/11]<br />Lee global history network (2011) Radio waves modulated by amplitude and frequency [Online image]. Available from: [25/01/11]<br />Public telecommunication networks unit (2001) How mobile phone networks work [WWW] Ofcom. Available from: [18/01/11]<br />Queensland university (2010) Mobile phones [Online image]. Available from: [24/01/11]<br />Virtual systems e-blacktech (unknown) Structure of cellular network [Online image]. Available from: [25/01/11]<br />