摘要
研究了开关键控(OOK)、脉冲位置调制(PPM)、脉冲间隔调制(PIM)和双头脉冲间隔调制(DH-PIM)等常用数字脉冲调制方式中的符号结构,给出了相应的公式及数学表达式,揭示了各种调制波形的映射规律和内在联系,证明了对于给定信源其每比特分辨率二进制码组的信源码值和最高有效位(MSB)是确定映射各种数字脉冲调制符号结构的关键.
The symbol structures of OOK, PPM, PIM and DH-PIM waveforms for optical wireless communication systems are examined, and some mistakes are found in other literatures. Particularly, the corresponding described expression or formula （ 1 ） - （6） about them are presented. It is shown that for a given resource, the decimal value of the input code word and the most significant bit （MSB） at M-bit resolution are the keys for the structure of every mapped symbol.
出处
《烟台大学学报（自然科学与工程版）》
CAS
2007年第1期31-34,共4页
Journal of Yantai University(Natural Science and Engineering Edition)
关键词
无线光通信
调制方式
符号结构
信源码值
optical wireless communication
modulation scheme
symbol structure
source weight
