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Microcap & Penny Stocks : Globalstar Telecommunications Limited GSAT -- Ignore unavailable to you. Want to Upgrade?

To: rhkohnen who wrote (15975)	8/20/2000 1:12:05 AM
From: finite_time	Read Replies (3) \| Respond to of 29987

System Capacity, There aren't any frequency restrictions on 3G that I am aware of, just bandwidth slots. rysavy.com The Gateway feeder links will not be used for users. Think you might be confusing I* with G* on the frequencies. ee.surrey.ac.uk As to system capacity. It was probably originally calculated using just voice. Here are two methods for estimating system capacity. Assume 9.6kbps is what is consumed for every connection (actually could be much less than that, see post Message 14208161 ). 1250000 Hz per channel / 9600 Hz = ~130 users / channel I believe that it is slightly less than that but it will do for now. From the Globalstar web site: User links: 1610-1626.5 MHz (user-to-satellite) 2483.5-2500 MHz (satellite-to-user) Feeder links: 5091-5250 MHz (gateway-to-satellite) 6875-7055 MHz (satellite-to-gateway) Using 1.25Mhz channels yields 13 channels for user uplink and downlink. (Yes I am aware of and have seen documents saying 16 channels, but just using what is currently listed on the website.) ( 1626.5 - 1610.0 ) Mhz / 1.25 Mhz per channel = ~13 channels user uplink ( 2500.0 - 2483.5 ) Mhz / 1.25 Mhz per channel = ~13 channels user downlink Now: 130 users / channel * 13 channels = ~ 1690 maximum simultaneous connections Now there are quite a few ways to get to the ~10B mins/year. And they all assume an equal spreading of the users across the system. One way is to estimate it by using the maximum user usage => 1690 * 100 Erlangs * 12 months * 100 minutes per month * 48 satellites = ~ 9.7 Billion minutes per year Or calculate the absolute maximum and multiply by some fraction which would be the number of useable sats / total number of sats .... say 1/4 (which is roughly the percentage of land mass of the total coverage) 1690 * 525600 mins per year * 48 sats = ~ 42.6 Billion minutes per year absolute maximum capacity now multiply by 1/4 => ~ 10.7B minutes per year Many other ways to get there. You will note from the linked post that the vocoders can shrink in BW usage and on average take up only 50% of the 9.6kbps which in my opinion means that the current 10B mins per year is a conservative number that possibly has a 100% reserve built in already. Again major assumption that users are spread evenly across the system. PS Did anyone find an answer to ... Message 14226757 ? finite_time