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  1. #1
    ChaosThyre81
    Guest

    "All of the power has to go into this
    narrow pulse. This pulsing several hundred times per second is what
    causes the interference with speakers and other equipment."

    CDMA phones from what I understand transmit at the lowest power
    possible to keep down noise and save battery life. Why don't TDMA/GSM
    phones do the same? Wouldn't this help cut down on interference? I'm
    not sure why TDMA phones sent out so much power when they send out
    these pulses??

    M.


    --
    ChaosThyre81



    See More: Analog VS Digital Question




  2. #2
    CharlesH
    Guest

    Re: Analog VS Digital Question

    Joseph wrote:
    > On Thu, 17 Mar 2005 22:38:34 +0000, ChaosThyre81
    > <[email protected]> wrote:
    >
    >>CDMA phones from what I understand transmit at the lowest power
    >>possible to keep down noise and save battery life. Why don't TDMA/GSM
    >>phones do the same? Wouldn't this help cut down on interference? I'm
    >>not sure why TDMA phones sent out so much power when they send out
    >>these pulses??

    >
    > CDMA handsets have much poorer battery life than either TDMA or GSM.
    > The equivalent CDMA model might have three days maximum standby where
    > the equivalent GSM or TDMA model will have over a week. CDMA is more
    > power hungry than GSM and TDMA.


    Don't know if they put smaller batteries on CDMA phones, but one point
    I've often heard is that it's not the radio transmitter, but rather that
    CDMA is much more computationally intensive than TDMA protocols like
    GSM. A TDMA phone (such as GSM) just has to know when to turn on to
    listen for its bits. A CDMA phone is doing some very fancy signal
    processing to pull the desired signal out of all the other "noise" on
    the same frequency band (its noise from its perspective, anyway; it is
    actually the other users). It likewise has to do complex calculations to
    compute the signal to be transmitted. Newer generation CDMA (1xRTT) has
    about twice the standby time as the first generation CDMA protocol.



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