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一种中继卫星系统多址应用设想
周林
0
(中国西南电子技术研究所,成都 610036)
摘要:
通过中继卫星系统中码分多址(Code Division Multiple Access,CDMA)/ 时分多址(Time Division Multiple Access,TDMA)能力、实现复杂度、容量等方面的分析,结合中继卫星系统传输数据在固定站点接入的特点,设想了一种前向采用同步CDMA、返向采用TDMA的混合多址应用方式。该方式充分利用了CDMA和TDMA方式的优点,巧妙地利用前向通道实现了TDMA的时隙同步,解决了CDMA方式下存在的多址干扰、远近效应、用户数扩展受限以及TDMA方式下的复杂时隙同步等问题,且应用灵活,实现简单,多用户数扩展性好,在工程应用上具有一定的参考意义。
关键词:  中继卫星  用户终端  同步码分多址  时分多址
DOI:
基金项目:
An idea for multi-access application of data relay satellite system
ZHOU Lin
(Southwest China Institute of Electronic Technology,Chengdu 610036,China)
Abstract:
Through analyzing the multi-access capability,implementation complexity and capacity of code division multiple access(CDMA)/time division multiple access(TDMA),according to the characters of transmitting data access to fixed station in data relay satellite system(DRSS),a mixed multi-access mode using synchronized CDMA in forward link and TDMA in return link is imagined.This mode takes full advantage of CDMA and TDMA to implement TDMA time-slot synchronization in forward channel to solve several problems existing in CDMA such as multi-access interference,far-and-near effect,limited user number expansion,and complicated time-slot synchronization.It is featured by flexible utilization,simple implementation,and good user number expandability,and has certain reference significance in engineering applications.
Key words:  data relay satellite  user terminal  synchronized CDMA  TDMA
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