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 use white LED as a lighting source and communication part, new modulation schemes such as reverse on-off keying with return-to-zero signal modulation (ROOK-RZ), reverse pulse position modulation (RPPM), reverse differential pulse position modulation (RDPPM), and reverse digital pulse interval modulation (RDPIM) are proposed for indoor visible light communications. Based on the given symbol structure, bandwidth requirement and average transmission power are analyzed and compared with on-off keying(OOK). Meanwhile, slot error rate is derived, and compared with each other. Simulation results show that OOK has the minimum bandwidth, while RPPM has the highest average transmission power and best slot error rate performance, but the maximum bandwidth.