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...Overview multiple access systems frequency band trade offs system applications employ to allow two or more earth stations simultaneously share the resources of same transponder channel these include three familiar methods fdma tdma and cdma another called space division sdma has been suggested in past practice is not really a method but rather technique reuse spectrum through spot beams on satellite because every provides some form an inherent feature all require degree coordination among users cannot transmit can at time capacity either case be calculated based total bandwidth power available within slice unique that beam this allowed transmissions use different code terms high speed spreading sequence hopping network unlimited however point becomes overloaded by self interference from who occupy it furthermore level control critical given carrier elevated will raise noise for others carriers always required networks involve way communications selection particular depends heavily spec...