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。
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.
作者
周林
ZHOU Lin(Southwest China Institute of Electronic Technology,Chengdu 610036,China)
出处
《电讯技术》
北大核心
2019年第10期1140-1144,共5页
Telecommunication Engineering
