To: RMiethe who wrote (4191 ) 4/27/1999 7:11:00 AM From: Maurice Winn Read Replies (1) | Respond to of 29987
Thanks for that good detailed information on capacity which all looks about right. As you can see, the calculations of capacity are not a simple matter of how many circuits x the number of hours in a day. The details you gave were about the electronic gizzards of the satellites; number of circuits, path diversity, beam size, frequency re-use, gateway switching capacity and all that jazz. Not mentioned were the watts from the photovoltaic panels and the storage capacity of the batteries. To talk of capacity while omitting these is like talking about how far a giraffe can run without legs. To make it obvious, if the photovoltaics are sufficient for a penlight, [25watts or so], then there is going to be very little capacity. If there are no batteries, the satellite will go quiet when eclipsed and all the circuits and frequency re-use in the world won't help. Loral has to provide enough juice and store it adequately, and Qualcomm has to eke it out, reusing frequency flat out and running the system very efficiently so as to not waste a drop of juice. These calculations are way too hard for us to even start to figure out. Especially since there are many variables we have no idea about [most of them]. Then there is the lumpy demand. China will be busy and over the Pacific very quiet. The key to capacity and maximum customer satisfaction and Globalstar profit is smoothed demand so that the satellites and gateways work in harmony. What is needed is a self-teaching algorithm so that the pricing feedback loop results in very busy circuits, smooth demand and maximum pricing. A pattern would develop quite quickly. Then further launches could be scheduled to maintain supply at optimum levels. CDMA is so good that 4 satellites would add to the constellation and smoothly [relatively] boost capacity thanks to batteries and CDMA soft handoff. Any self-respecting software geek should already be drooling at the prospects of such a self-teaching feedback programme. SurferM's mates at MIT have probably got some absurd model running for optimized coffee collection schedules in the cafetaria to minimize delays, maintain coffee temperature and including the chance of eyeing some babes who try to randomize their coffee shop visits to avoid computer nerds ogling them*. The engineering capacity is already planned and in space, now the marketers have to maximize the profits from those minutes. Don't hold your breath. Maurice * though I hear computer nerds, thanks to huge incomes, have achieved some significant status - ahead of football jocks for example [OJ didn't help]