分析了在超宽带通信系统中的扩频干扰，并用两种通用的调制技术实现了对提出的抗干扰方法的仿真-he ultra wideband (UWB) interference to direct sequence spread spectrum (DSSS) receiver is analyzed. Two popular UWB modulation schemes, the time hopping pulse position modulat

对可见光通信的调制模块进行研究，并且对各种调制方案的调光功能进行了研究和比较。-we propose a MPPM to offer both functions of modulating data-stream and controlling the brightness at the same time.From our studies, we show that MPPM is superior to variable on–off keying (VOOK) and var

different pulse position modulation