In DVB system,E_b/N_0 or C/N can verify the basic performance. This paper introduces their basic concept and mathematical relationship.

• 在DVB数字视频广播系统中,能够用Eb/N0或C/N来表征系统基本性能,介绍Eb/N0和C/N的概念,并描述Eb/N0与C/N的代数关系。