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| Content Provider | IET Digital Library |
|---|---|
| Author | Gopal, Pooja Jain, V. K. Kar, Subrat |
| Abstract | In this study, power spectral densities (PSDs) of intensity modulation schemes used in free space optical communications namely, on-off keying (OOK), pulse-position modulation (PPM), digital pulse interval modulation (DPIM), pulse amplitude and position modulation (PAPM) and differential amplitude pulse interval modulation (DAPIM) have been derived. The bandwidth requirements of these schemes are determined from the occurrence of the first null in the PSDs. For comparison we have considered OOK, 8-PPM, 8-DPIM, 2 × 4-PAPM and 2 × 4-DAPIM. Among all the schemes considered, the bandwidth requirement of 2 × 4-DAPIM is the least. Although 8-PPM has the least effect of baseline wander and the maximum detected optical power among all the schemes considered, the bandwidth requirement is very high. This may not be desirable in certain cases. The PSD curves are quite important in the link design as these will give information on how the signal power is changing with the bandwidth. If the noise PSD is also known then these curves can be used to determine the optimum bandwidth for maximum signal-to-noise ratio. The results are helpful in the selection of modulation scheme for free space optical links and to determine how the power content of the signals is affected by filters and other devices in the link. |
| Starting Page | 909 |
| Ending Page | 916 |
| Page Count | 8 |
| ISSN | 17518628 |
| Volume Number | 9 |
| e-ISSN | 17518636 |
| Issue Number | Issue 7, May (2015) |
| Alternate Webpage(s) | https://digital-library.theiet.org/content/journals/iet-com/9/7 |
| Alternate Webpage(s) | https://digital-library.theiet.org/content/journals/10.1049/iet-com.2014.0869 |
| Journal | IET Communications |
| Publisher Date | 2015-03-16 |
| Access Restriction | Open |
| Rights Holder | © The Institution of Engineering and Technology |
| Subject Keyword | Amplitude Shift Keying DAPIM Differential Amplitude Pulse Interval Modulation Digital Pulse Interval Modulation DPIM Free Space Optical Communication Intensity Modulation Intensity Modulation Scheme Maximum Optical Power Detection Modulation And Coding Method On-off Keying OOK Optical Communication Optical Modulation PAPM Power Spectral Density PPM PSD Pulse Amplitude And Position Modulation Pulse Amplitude Modulation Pulse Position Modulation Pulse-position Modulation Signal Processing And Detection Signal to Noise Ratio Spectral Analysis |
| Content Type | Text |
| Resource Type | Article |
| Subject | Electrical and Electronic Engineering Computer Science Applications |
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