Radio communication and the mobile phone

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