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  1. #11
    Senior Member
    Join Date
    Dec 2003
    Member #
    CDMA // Code Division Multiple Access
    What is Code Division?
    I know that in GSM the areas are divided by cells, and the interfereting frequency problem is solved: each cell has 6 cells of hexagonal shape (imagine a hexagon, with 6 smaller hexagons inside), hexagon number 1 which is at the top uses a frequency, let's say 1GHz (I don't have any idea of what are the real frequencies used in GSM), hexagon number two has 1'1GHZ, and so on. Then on another big cell near to this one, it's in the same order, cell 1 uses 1 GHz, etc. Like this the cells are enough separated from another with the same frequency to avoid interferences, and if you are getting close to someone with the same frequency, the network changes moves you to another cell.

    (Wow, that was difficult to explain for me in English )
    What are the differences between TDMA and GSM that makes the first one better for large areas?



  3. #12
    Senior Member splufdaddy's Avatar
    Join Date
    Feb 2003
    Boston, MA
    Member #
    CDMA uses a wider spectrum to transmit calls. CDMA is like a cable modem where TDMA is like dialup. CDMA uses sequential code frequencies to funnel traffic channels within the same radio channels.

    TDMA samples 30 milliseconds of a call and then transmits this information in 10ms, resulting in a round robin sharing of the tower.

    Not sure why it's better for larger areas, except that it's a less expensive network to build.

    I got most of this information from:
    CDMA info
    TDMA info

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