摘要
基于OFDM的数字电视传输系统由纠错处理和数字调制等组成。采用数据加扰技术使输入的高码率串行数据流与8bit伪随机序列进行模2加。对加扰后的数据字节进行纠错编码和数据交织,再经串/并转换均匀分散成N路。N路符号分别对N个子载波调制,得到FDM信号。最后进行并/串、D/A及模拟处理,形成中频信号,通过发射机调制到高频载波上实现发送传输。
Digital television transmission system based on the OFDM consists of Error correction processing and digital modulation parts etc. Firstly, adopting the technique of data adding interference, make string data stream inputted at a high bit rate and false random preface to add in row mold 2. Error correction coding and data intertexture for data bytes added interference were taken, and then it was divided average into N paths by string-parallel conversion. N son-carrier waves were modulated respectively with N paths symbol and got FDM signal. Finally, parallel-string, D/A conversion and analog processing was put up to form IF signal, IF signal modulated was modulated over the high frequency carriers to send out by transmitter.
出处
《兵工自动化》
2004年第4期56-58,共3页
Ordnance Industry Automation
关键词
数字电视
数字传输
OFDM调制
Digital television
Digital transmission
Orthogonal Frequency Division Multiplexing (OFDM)
