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Electromagnetic Interference in Cell Phones

  1. Dec 19, 2014 #1
    Consider two adjacent people speaking in cell phones. Why the signals don't interfere with one another? Does each phone communicate with a distinct frequency? If so, how?
     
  2. jcsd
  3. Dec 19, 2014 #2

    jedishrfu

    Staff: Mentor

    This is an example of spread spectrum technology in particular CDMA (Code Division Mulitiple Access)

    http://en.wikipedia.org/wiki/Spread_spectrum

    http://en.wikipedia.org/wiki/Code_division_multiple_access

    From the above wikipedia articl is the analogy quoted below:
     
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