In order to use white light emitting diode(LED) as a lighting source and communication part, a new modulation scheme called reverse dual header pulse interval modulation(RDH-PIM) is proposed for indoor visible light c...In order to use white light emitting diode(LED) as a lighting source and communication part, a new modulation scheme called reverse dual header pulse interval modulation(RDH-PIM) is proposed for indoor visible light communications based on the analyses of the structures of on-off keying(OOK), pulse position modulation(PPM), digital pulse interval modulation(DPIM) and dual header pulse interval modulation(DH-PIM). After analyzing and comparing the symbol structure, bandwidth requirement and average transmission power of different modulation methods, the slot error rate is derived. Simulation results show that OOK has the minimum bandwidth, while RDH-PIM has the highest average transmission power and its bandwidth efficiency is obviously better than those of PPM and DPIM. Hence, RDH-PIM is superior in optical wireless communication systems.展开更多
Due to variable symbol length of digital pulse interval modulation(DPIM),it is difficult to analyze the error performances of Turbo coded DPIM.To solve this problem,a fixed-length digital pulse interval modulation(FDP...Due to variable symbol length of digital pulse interval modulation(DPIM),it is difficult to analyze the error performances of Turbo coded DPIM.To solve this problem,a fixed-length digital pulse interval modulation(FDPIM) method is provided.The FDPIM modulation structure is introduced.The packet error rates of uncoded FDPIM are analyzed and compared with that of DPIM.Bit error rates of Turbo coded FDPIM are simulated based on three kinds of analytical models under weak turbulence channel.The results show that packet error rate of uncoded FDPIM is inferior to that of uncoded DPIM.However,FDPIM is easy to be implemented and easy to be combined.with Turbo code for soft-decision because of its fixed length.Besides,the introduction of Turbo code in this modulation can decrease the average power about 10 dBm,which means that it can improve the error performance of the system effectively.展开更多
Aiming at implementing the digital pulse interval modulation(DPIM) for optical wireless communications(OWC),a dual-mapping technique is presented.The scheme of DPIM train based upon the dual-mapping technique is given...Aiming at implementing the digital pulse interval modulation(DPIM) for optical wireless communications(OWC),a dual-mapping technique is presented.The scheme of DPIM train based upon the dual-mapping technique is given.Its slot error rate is derived for the avalanche photonic diode(APD) receiver model,and is compared with that of classical DPIM.Simulation results show that the dual-mapping DPIM(D-DPIM),which has a fixed slot length,only has marginally inferior error performance,but can solve waiting slots or buffer overflowing in comparison with DPIM.Hence,it is suitable for the optical wireless communication systems.展开更多
基金supported by the National Natural Science Foundation of China(No.61371113)the Ministry of Transport Application Foundation Research Project(No.2013-319-825-110)+1 种基金the Graduate Research and Innovation Plan Project of the Universities of Jiangsu Province(No.CXZZ13_0689)the Graduate Research and Innovation Plan Project of Nantong University(No.YKC13001)
文摘In order to use white light emitting diode(LED) as a lighting source and communication part, a new modulation scheme called reverse dual header pulse interval modulation(RDH-PIM) is proposed for indoor visible light communications based on the analyses of the structures of on-off keying(OOK), pulse position modulation(PPM), digital pulse interval modulation(DPIM) and dual header pulse interval modulation(DH-PIM). After analyzing and comparing the symbol structure, bandwidth requirement and average transmission power of different modulation methods, the slot error rate is derived. Simulation results show that OOK has the minimum bandwidth, while RDH-PIM has the highest average transmission power and its bandwidth efficiency is obviously better than those of PPM and DPIM. Hence, RDH-PIM is superior in optical wireless communication systems.
文摘Due to variable symbol length of digital pulse interval modulation(DPIM),it is difficult to analyze the error performances of Turbo coded DPIM.To solve this problem,a fixed-length digital pulse interval modulation(FDPIM) method is provided.The FDPIM modulation structure is introduced.The packet error rates of uncoded FDPIM are analyzed and compared with that of DPIM.Bit error rates of Turbo coded FDPIM are simulated based on three kinds of analytical models under weak turbulence channel.The results show that packet error rate of uncoded FDPIM is inferior to that of uncoded DPIM.However,FDPIM is easy to be implemented and easy to be combined.with Turbo code for soft-decision because of its fixed length.Besides,the introduction of Turbo code in this modulation can decrease the average power about 10 dBm,which means that it can improve the error performance of the system effectively.
文摘Aiming at implementing the digital pulse interval modulation(DPIM) for optical wireless communications(OWC),a dual-mapping technique is presented.The scheme of DPIM train based upon the dual-mapping technique is given.Its slot error rate is derived for the avalanche photonic diode(APD) receiver model,and is compared with that of classical DPIM.Simulation results show that the dual-mapping DPIM(D-DPIM),which has a fixed slot length,only has marginally inferior error performance,but can solve waiting slots or buffer overflowing in comparison with DPIM.Hence,it is suitable for the optical wireless communication systems.
