Globalstar Telecommunications Limited GSAT Message Board

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Microcap & Penny Stocks : Globalstar Telecommunications Limited GSAT

GSAT 49.60

+2.8%

1:48 PM EST

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To: Cigar who wrote (4266)	4/28/1999 9:44:00 AM
From: CommSatMan	Read Replies (2) of 29986

Neither Iridium nor G* was designed to operate in a building. Without going in to a lot of technical detail about communication paths and link equations, the basic difference between G* and Iridium is that G* uses diversity. What this means is that Iridium selects the best satellite in view and sticks with it until it needs to hand off to another satellite or beam because there is mostly only one satellite in view. This is latitude dependent and the higher the latitude (ie. as you get closer to the poles) the more satellites become visible. In any event, Iridium is designed with 16 dB of link margin. Typically, terrestrial cellular systems are designed with 35 dB of link Margin. It takes somewhere around 25 dB of link margin to penetrate a building. This is dependent on building construction. The more metal and concrete the more link margin needed to penetrate. Any way, the bottom line is that Iridium was not designed to work inside a building and will always give poor performance because there just isn't enough link margin to overcome the losses. G* was designed with about 10 dB of link margin and so it will not support in building use either. However, because the system has diversity, it simultaneously compares multiple signals and selects the best one. Now, if you have enough satellites, the theory is that you will have visibility in to a building thru a window. However, inside an interior room, you would have no chance. G* will have the same performance problems inside a building. However, depending on when all satellites are on orbit and where you are, you could get coverage thru a window because of diversity. CSM

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