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Technology Stocks : Qualcomm Incorporated (QCOM)
QCOM 174.01-0.3%Nov 14 9:30 AM EST
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To: straight life who wrote (25361)3/28/1999 1:15:00 AM
From: Clarksterh  Read Replies (2) of 152472
 
Anybody have an idea on what 4G entails?

First, the exact definitions of 1g, 2g and 3g are pretty fuzzy. If you define it by data rate then analog is 1g and GSM/CDMAOne are 2g and CDMA-2000,W-CDMA are 3g. If you define it by MIPs in the phone and transmit power then analog is 1g, GSM is 2g and CDMAOne, CDMA-2000 and W-CDMA are all 3g. Which definition do you choose?

This is by way of demonstrating that 4g is in the eye of the beholder. But, the next step in cell phones will almost certainly be Spatial Division Multiple Access (SDMA) where the basestation will electronicly create a directional antenna for each user. This will allow lower powered handset, or higher data rate or both while simultaneously boosting the capacity of each cell. With this technology it will probably actually become possible to allow everyone to have mobile video phones and wireless will probably supplant wireline even in places like the US. 4g may also include such things as Multi User Detection where the recieving device decodes other users and subtracts them out from the signal you are trying to decode. (In current systems this isn't done and the other users end up being interfering noise.) Alternatively 4g may use some new transmission modulation scheme like OFDM.

Hope this helps.

Clark
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