摘要
研究了多电平正交幅度调制（ＱＡＭ）星座图的选取及５１２ＱＡＭ调制解调器的实现，给出了多种星座图的设计方法并比较了各自的系统性能。
The selection of multi level QAM constellation and the realization of 512QAM modem are discussed in this paper. The stepped QAM constellation, which is widely used in SDH microwave transmission systems, is selected because it can be realized easily with better characteristics.
出处
《南京邮电学院学报》
1998年第3期57-60,共4页
Journal of Nanjing University of Posts and Telecommunications(Natural Science)
