Abstract
As a national key infrastructure communication，as well as an organic
part of the global mobile communications，Star mobile communication
system in national security,emergency rescue，Internet，satellite TV
broadcasting，remote teaching and personal mobile communication has been
widely used in such aspects. A new generation of broadband satellite
communication system can provide personal telecommunication business，
multicasting，remote transmission，the Internet is a global seamless
personal communications，high-speed Internet air passage means necessary.
Satellite communication technology development in recent years ，
especially in low orbit satellite mobile communication system has
received the widespread attention，its research and application has
become a national strategic priorities. Wireless resource management is
the study of Leo satellite mobile communication system is an important
content，this is mainly due to the satellite system resources is very
expensive，therefore how to reasonable and effective management and use
of the resources of satellite system has become a key.
Through the low orbit satellite studies the basic characteristics of
wireless channel，the article specifically from wireless channel faults
is analyzed，and the matlab simulation，it is concluded that the signal
after a multipath channel amplitude frequency characteristics，multipath
channel attenuation is different on different frequency signal，which
has the frequency selectivity，as well as the attenuation of the signal
through the multipath channel，and the influence of element spacing to
transmission signal，the signal of the symbol interval must be greater
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