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I am doing a little research about comparison between 2g and 3g wireless communication technologies in terms of physical OSI layer. I want to focus especially coding differences. However, I couldn't be sure which coding methods are subjects for physical layer. Source coding, channel coding and line coding are coding techniques that I can find by now. Recently, I figured out that channel coding is in link layer (2. layer). My question is which topics I have to focus on.

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For layer 1 (Physical) you may compare (if you compare only the radio interface):

  • Electromagnetic spectrum (radio frequencies)
  • Channel width
  • Spectral efficiency
  • Signal levels
  • Modulation
  • Antennas, feeders, power of transmitters, sensitivity of receivers and other parameters

And these maybe are on the border between layer 1 and 2 :

  • channel coding
  • media access method

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