DVB-C接收机中自适应均衡器的新设计  

New Design of Adaptive Equalizer in DVB-C Receiver

作　　者：张力[1] 宫丰奎[1] 李兵兵[1] 

机构地区：[1]西安电子科技大学通信工程学院,陕西西安710071

出　　处：《电视技术》2004年第4期46-48,共3页Video Engineering

摘　　要：着重讨论一种全新的DFE与盲均衡相结合的自适应均衡器的设计,对于符合DVB-C标准的QAM信号,在输入存在多径、频偏及加性噪声的情况下,采用此设计无须借助于训练序列或导频即可成功对信道进行自适应均衡以抵消ISI,并能自动切换捕获和跟踪模式,仿真效果良好。此外还能在一定范围内对输入的符号功率进行调整以降低AGC模块的设计要求。The design of a completely new adaptive equalizer that combines DFE with blind equalization is emphasized in this paper. For QAM signals to DVB-C standard and under the conditions of that multipass, frequency deviation and additive noise exist in the input, the channel can be adaptively equalized by means of this design without the need of sequence training or pilot frequencies to eliminate ISI. The switching between capturing and tracking modes can be performed automatically. Simulation shows that the result is good. In addition, within a certain range, the symbol power can be adjusted so as to lower the requirements on the design of AGC module.

关 键 词：QAM解调器 自适应均衡器 盲均衡 符号间干扰 判决反馈均衡器 DVB-C接收机 结构设计 

分 类 号：TN948.55[电子电信—信号与信息处理]