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Technology Stocks : Qualcomm Incorporated (QCOM)
QCOM 165.31+1.2%10:59 AM EST
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To: waitwatchwander who wrote (15042)9/16/1998 3:12:00 AM
From: Ramus  Read Replies (3) of 152472
 
I think the question here is "how does turning up the RF output power increase the bandwidth?" When the output RF amplifier is operated linearly, that is, the output waveform is a replica(although greater amplitude) of the input waveform, then amplification without distortion is taking place. If you drive an amplifier too hard, so that the output waveform is distorted, this can produce distortion products. These are generally referred to as intermodulation distortion products. In digital systems these distortion products are usually measured as adjacent channel power, since if the channels are close together these products may fall within an adjacent channel and interfere with it. A measure of how well an amplifier linearly amplifies a digital modulation signal might be its Adjacent Channel Power Rejection or ACPR. So, if you overdrive a given amplifier it might produce more adjacent channel power...yes, turning up the power too much can further spread an already spread signal(CDMA)....and interfere with adjacent channels. It's true that increasing the power from a single mobile increases the overall noise floor for other users and decreases the capacity of the cell. But, it could also have the effect of increasing the noise floor in adjacent channels.

W.
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