In order to use white LED as a lighting source and communication part，a novel modulation scheme called reverse dual header pulse interval modulation (RDH- PIM) is proposed for indoor visible light communications based on the analysis of on- off keying (OOK)，pulse position modulation (PPM)，digital pulse position modulation(DPIM)，and dual header pulse interval modulation (DH- PIM). The symbol structure,bandwidth requirement and average transmit power are analyzed and compared, and the slot error rate is derived. The simulation results show that OOK has the minimum bandwidth, while RDH- PIM has the highest average transmit power and its bandwidth efficiency is notably better than PPM and DPIM. Hence, RDH-PIM is superior in the optical wireless communication system.