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My question is regarding the location of GSM channel access methods TDMA/FDMA.

Here is an illustration how voice is processed before reaching the base station on a tower:

enter image description here

It is not mentioning the multiplexing(TDMA/FDMA) part.

I have two questions:

1) Where is the modulation carried out? On the Base Station or before?

2) Where is the multiplexing(TDMA/FDMA) occurs? On the Base Station or before?

(Is base station just composed of antennas for transmission or also includes any of those processes?)

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All of the things shown in green boxes are carried out on the mobile station. The final red arrow means "transmit from mobile antenna to base station".

Think about it: the entire point of the modulation is to be able to transmit!

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  • \$\begingroup\$ Oh you are right thanks. But how abot TDMA FDMA multiplexing? Do they occur on the BS tower or some where else? \$\endgroup\$
    – user16307
    Commented Apr 23, 2015 at 9:37
  • \$\begingroup\$ Again, the multiplexing is for the purpose of transmission. It's the "radio burst multiplexing" box on the diagram. \$\endgroup\$
    – pjc50
    Commented Apr 23, 2015 at 9:54
  • \$\begingroup\$ So TDMA and FDMA happend inside the phone? But dont you need many users data multiplex? Im confused \$\endgroup\$
    – user16307
    Commented Apr 23, 2015 at 9:56
  • \$\begingroup\$ The phone transmits in its timeslot. Other phones transmit in different timeslots. The base station demultiplexes these. \$\endgroup\$
    – pjc50
    Commented Apr 23, 2015 at 10:30

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