| 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： |
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| 基金项目: |
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| 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 |
