A Networking Scheme of Wideband Ground-Air Communication System
Kechu Yi · Dianzi xuebao · 2010
Aiming at the characteristics of large multipath delay and fast channel variation in wideband ground-air communications with low elevation,a networking scheme of star-shape topology based on a novel multi-access mode is proposed.Its inbound link is an asynchronous CDMA mode based on Golay complementary sequences,while its outbound link uses code division multiplexing based on Walsh sequences M-ary spectrum spreading.The inbound link has very strong ability of anti-multi-access-interference,and the both links have very strong ability of anti-multi-path-fading since they employ filter-banks for frequency equalization(FB-FDE) in their receiving terminals,moreover they have the characteristics of high frequency efficiency and low complexity in implementation.The multi-access mode and networking scheme is quite suitable for the channel condition of wideband ground-air communication system with low elevation.The main performance of the system has verified by simulation experiments,and the results show that it is promising in practical applications.