摘要 : This paper assesses the performance of dual header pulse interval modulation (DH-PIM) over indoor optical wireless systems DH-PIM being anisochronous scheme offers a built-in symbol synchroni/ation capability. Theoretical and simu... 展开 This paper assesses the performance of dual header pulse interval modulation (DH-PIM) over indoor optical wireless systems DH-PIM being anisochronous scheme offers a built-in symbol synchroni/ation capability. Theoretical and simulation results demonstrate that DH-PIM offers shorter symbol length, improved transmission rate and bandwidth requirement and a comparable power spectral density profile compared with digital pulse interval modulation (DPIM) and pulse position modulation (PPM) schemes. It is shown that DH-PIM_2, with wider pulse duration is the preferred option when the available channel bandwidth is limited and higher optical power is tolerable. Whereas DH-PIM_1, with narrower pulse width, exhibits comparable power requirements but a marginally higher bandwidth compared with DPIM, and is also more bandwidth efficient than PPM at the cost of increased power requirement. However, at higher bit resolutions, i.e. M ≥ 7, DH-PIM_1 is both bandwidth and power efficient compared with PPM. Error rate analysis show that DH-PIM offers improved packet error rate compared with on-off-keying (OOK) and DPIM, but marginally inferior as compared with PPM. The power requirement and penally due to intersymbol interference for non-dispersive and dispersive channels is analysed and the results show that for given parameters, DH-PIM requires marginally higher optical power compared with PPM and DPIM. but it supports the same bit rate at much less bandwidth requirement. 收起