*OFDM = Orthogonal Frequency Division Multiplexing* Clark, that was such a good explanation. Thank you! Maybe not simple enough for Joe6Pack, but great for me and I'm sure many others. More contributions/opinions appreciated from others. But how about that OMC-CDMA?
Since Qualcomm, along with everyone else, seems to be heading for flat rate pricing, they are assuming that the cost of minutes is now so low that nobody cares anymore and they'll just eat all they feel like eating. There is no longer any need to try to spread loading, maximize erlangs per bushell, increase minutes used from 20% to 50% of capacity, or otherwise further improve the system. Service providers will just bung in some more base stations and get the minutes used back down to 20% of network capacity.
10 cents per minute seems way too high for flat rate pricing, but that's the way it's going for now.
So why bother with OMC-CDMA or OFDM if nobody cares about further spectral capacity improvements? Capacity will already be so underused it doesn't matter.
When people are thrashing their WWeb devices and gobbling spectrum like there's no tomorrow we might find the Flat Rate pricing schemes get ditched. Maybe then OFDM and OMC-CDMA will come into their own. Especially if they go with 3D images at 10 megabit per second rates, or 100 megabit per second if you want to scan 3D across a field of view, with stereophonic sound thrown in.
With processing power, software radio and other developments not showing any sign of slowing down, how many decades do you think it might be before OMC-CDMA or OFDM become computationally possible in an Anita [TM] type WWeb device? I'm sure that 5 years is too soon. But 10 years might see some changes in that direction! MUD [Multi-User Detection] shouldn't take as long as these. With MUD hooked onto cdma2000 [or WWeb], how much more advantage would be left for the OFDM crowd? Is it an order of magnitude or just a 30% capacity improvement with processing delays due computational difficulty and processor limits making it even more problematic?
Meanwhile, two-stick bathtub directional aerials and other tricks will improve cmda2000 capacity, hopefully enabling prices to drop out the bottom. But efficiency is a harsh taskmaster and inefficiency is evolutionarily fatal given time.
I'll sleep on it!
Thanks for any more you can offer.
Mqurice |
