论文部分内容阅读
为了利用白光LED实现照明和通信的双重功能,根据室内照明可见光通信的特点,提出了反向归零码开关键控(ROOK-RZ)调制、反向脉冲位置调制(RPPM)、反向差分脉冲位置调制(RDPPM)和反向数字脉冲间隔调制(RDPIM)。在给出符号结构的基础上,分析比较了各种调制方式的带宽需求和平均发射功率,推导了误时隙率表达式,并对各种调制方式的误时隙率进行了比较。结果表明,开关键控(OOK)具有最小的带宽需求,RPPM可获得最大的平均发射功率和最好的误时隙率,但带宽需求最大。
In order to realize the dual function of lighting and communication by using white LED, according to the characteristics of visible light communication in indoor lighting, the paper presents the key technologies of ROOK-RZ modulation, reverse pulse position modulation (RPPM), reverse differential pulse Position Modulation (RDPPM) and Reverse Digital Pulse Interval Modulation (RDPIM). Based on the symbol structure, the bandwidth requirements and the average transmit power of various modulation schemes are analyzed and compared. The error time-slot rate expressions are deduced, and the error time-slot rates of various modulation schemes are compared. The results show that OOK has the smallest bandwidth requirement, RPPM achieves the highest average transmit power and the best false slot rate, but the bandwidth requirement is the largest.