面向卫星网络的扩频多址接入控制方法  

Spread Spectrum Multiple Access Control Method for Satellite Network

作　　者：陈蕾[1] 肖甫[1] 

机构地区：[1]南京邮电大学计算机学院,江苏南京210003

出　　处：《计算机技术与发展》2010年第12期240-243,250,共5页Computer Technology and Development

基　　金：国家自然科学基金(60703086;60973140);国家高科技"863"项目(2007AA0820);江苏省博士后基金(0801019C)

摘　　要：针对卫星网络传输时延长、通信时间短和突发业务量大的特点,首先设计了高优先级、高实时性业务主动重传策略,然后在此基础上提出了一种面向卫星网络的主动重传扩频时隙ALOHA多址接入控制方法。该方法融合了扩频通信、S-ALOHA随机访问控制协议和主动重传策略的优点,能满足特殊环境中提供"区分服务"的实际要求。最后的仿真结果不仅证实了该方法的吞吐性能比时隙ALOHA系统有了很大的提高,而且能以较小的吞吐量损失为代价增加高优先级业务的成功发送率。For satellite network with high propagation delay,short communication time and sudden large amount of business,an active repeat transmission strategy applicable to high-priority and real-time business was designed,and based on it,the multiple access control method of active repeat spread spectrum slottedALOHA（AR-SS-S-ALOHA） for satellite communication network was presented.The proposed method combines the advantages of spread spectrum communication,S-ALOHA random access control protocol and active repeat transmission strategy,and can provide ＂differentiated services＂in special circumstances.Finally,computer simulations demonstrate that AR-SS-S-ALOHA has not only better throughput performance than that of S-ALOHA,but also increases effective sending rate of high-priority business with a slight loss of throughput.

关 键 词：卫星通信 扩频时隙ALOHA 主动重传 随机多址接入协议 

分 类 号：TN914.5[电子电信—通信与信息系统]