摘要
正交幅度调制(QAM)是一种频谱利用率很高的载波传输方式,但是高阶QAM系统对于载波恢复、符号定时的要求非常严格,因此提出了一种全数字的载波提取方案。在发送端插入前导序列,接收端在接收前导序列中用数字锁相环实现载波提取,为后面的解调作保证。通过MATLAB仿真,验证了这种实现方案在理论上是完全可行的。
QAM system is a high efficient use of spectrum, but it is quite sensitive to the tiing and carrier phase deviation. So carrier recovery is needed. In this paper, We use Ppreamble sequence and digital PLL to recover the carrier. MATLAB simulation has been carried out in order to verify the theoretical analysis.
出处
《微处理机》
2007年第6期15-16,18,共3页
Microprocessors
