Qualcomm Incorporated (QCOM) Message Board

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Technology Stocks : Qualcomm Incorporated (QCOM)

QCOM 166.05

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3:59 PM EST

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To: chuckj who wrote (3750)	8/23/1997 7:20:00 PM
From: Ramus	of 152472

chuckj, you are correct about what is understood to be a 3dB(doubling) increase in noise power results in a 2 fold decrease in capacity. At least in terms of the ratio of energy per bit/Noise power spectral density + interference. I'm imagining a number of SS signals occupying the same frequency spectrum but using essentially orthognal spreading codes, all other things being equal(power levels, detector characteristics etc.). Why is this the catch 22 of CDMA? Why does this aspect alone make CDMA comparable in capacity to TDMA? What about the implications of frequency reuse? Of sectorization? And finally....fragile power management.."which is prone to breakdown"? Would you care to enlighten us? W.

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