MC-CDMA应用于TDRSS多址业务的关键技术研究

Key Technology Research on MC-CDMA in TDRSS MA Services

传统TDRSS的多址业务采用单载波CDMA扩频方式，数据传输速率和频带利用率低，设备复杂。本文提出采用MC—CDMA方式代替现有的单载波CDMA方式，结合TDRSS的应用环境对MC—CDMA上下行链路的结构进行分析，并对扩频序列设计、信道估计和系统同步三方面的关键技术问题提出解决方法。采用MC—CDMA可以大大提高现有TDRSS多址业务的数据传输速率，频带利用率提高一倍，设备简单，在未来的航天通信中具有重要的现实意义。

DS-CDMA with a single carrier has been applied abroad in the traditional TDRSS MA services. This method has low data transmission rate, poor frequency efficiency and complex structure. The MC-CDMA method is presented to substitute the DS-CDMA mode in this paper, the uplink and downlink system structure is analyzed and the solutions of spreading sequence design, channel estimation and system synchronization are also put forward. The MC-CDMA mode has the advantages of high data transmission rate, double frequency efficiency and simple structure, and has the great importance in the future spacecraft communications.