ACM技术在卫星通信IP网互联中的应用  

Application of Adaptive Coding and Modulation Technique in IP Networks Interconnection over Satellite Communication

作　　者：林习良[1] 周锦标[1] 赵乾宏[1] 

机构地区：[1]中国卫星海上测控部,江苏江阴214431

出　　处：《电讯技术》2013年第12期1598-1604,共7页Telecommunication Engineering

摘　　要：自适应编码调制(ACM)技术根据信噪比自适应改变编码和调制方式,可将链路余量自动转换为链路传输能力,从而提高无线信道的频谱利用率。为解决卫星通信中IP化传输对电路带宽需求增加的问题,提出了应用自适应编码调制技术进行IP网互联的方案,通过对DVB-S2_ACM与VersaFEC_ACM两种不同技术的性能比较,分析了VersaFEC_ACM技术在岸船卫星通信IP网互联中应用的可行性及工作过程。链路计算与性能比较结果表明,该技术的应用可使岸船间原有的1 024 kb/s电路带宽利用率提高95%,同时抗信道衰落的余量提高6 dB,能够提高卫星通信资源利用率和系统可用度。研究结果可为后续工程应用提供参考。The signal-to-noise ratio （ SNR） metric is used to determine the mode of coding and modulation in adaptive coding and modulation（ ACM） technique. ACM turns fade margin into increased link capacity and promises to improve the spectral efficiency in wireless channel. In order to solve the problem of the in-creased requirements for transmission bandwidth in IP-based satellite communication, scheme of applying adaptive coding and modulation technique to IP networks interconnection is proposed. By comparison of the performances between two different techniques, DVB-S2_ACM and VersaFEC_ACM, the feasibility and working process of applying VersaFEC_ACM technique to IP networks interconnection over satellite com-munication between the ship and land are analyzed. Link budget calculation and performance comparison results show that bandwidth utilization is improved by 95% while the anti-fading margin increased by 6 dB for the channel of 1 024 kb/s between the ship and land. The resource utilization and system availability in satellite communications can be improved with the technique. This research provides a reference for subse-quent engineering applications.

关 键 词：卫星通信 IP网 自适应编码调制 频谱效率 系统可用度 

分 类 号：TN927[电子电信—通信与信息系统] TN911[电子电信—信息与通信工程]