调制编码方式对宽带卫星系统广播链路性能影响的研究

Research of Boradband Satellite System Broadcast Link Performance in Different MODCOD

宽带卫星系统具有容量大、受地理条件限制小、覆盖范围大、可扩展性好、安全可靠、广播能力固定等优点,是地面通信网络的有效补充。本文建立了基于DVB-S2/RCS协议的宽带卫星系统仿真平台,研究了广播链路在不同调制编码方式时的信息效率、信道码元速率,分析了误码率为10-7时,各种调制编码方式所需信噪比大小及达到的频谱效率。研究结果表明,对于使用DVB-S2的广播链路,相同调制方式下,信息效率、频谱效率随着编码效率的增加而增加,信道码元速率随着编码效率的增加而减小。

Broadband satellite system has advantages of big capacity, less limitation by geographic conditions, large coverage, good scalability, high reliability, fixed broadcast function and so on. It is an ef ective supplement of communication network on the ground. In this paper, broadband satellite system simulation platform is established based on DVB-RCS/S2, information efficiency and channel symbol rate are researched in different MODCOD, and SNR and spectrum efficiency of different MODCOD are analysed when BER is 10-7. The results show that in DVB-S2 broadcast link, information efficiency and spectrum efficiency increase with coding efficiency increasing, and channel symbol rate decreases with coding efficiency increasing.