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| Content Provider | IET Digital Library |
|---|---|
| Author | Dabiri, Mohammad Taghi Sadough, Seyed Mohammad Sajad Khalighi, Mohammad Ali |
| Abstract | To improve the bandwidth efficiency of free-space optical systems and at the same time to reduce the impact of the background noise, a differential M-ary pulse-amplitude modulation (M-PAM) signalling scheme that uses two laser transmitters is proposed. The authors first consider the condition that the receiver perfectly knows the instantaneous channel coefficient and compare the performance of the proposed differential PAM with the conventional PAM signalling and show the improved performance when the background noise level is relatively high. Second, the practical situation where the receiver has to estimate the channel for signal detection is considered. The authors propose an estimation scheme based on the characteristics of the differential PAM signalling while requiring no pilot symbol transmission. The proposed data-aided channel estimation is performed on a sequence of received PAM symbols. The authors also show that for a sufficiently large observation window, the proposed estimation method allows achieving a performance close to the perfect channel knowledge. |
| Starting Page | 155 |
| Ending Page | 160 |
| Page Count | 6 |
| ISSN | 17518768 |
| Volume Number | 13 |
| e-ISSN | 17518776 |
| Issue Number | Issue 4, Aug (2019) |
| Alternate Webpage(s) | https://digital-library.theiet.org/content/journals/iet-opt/13/4 |
| Alternate Webpage(s) | https://digital-library.theiet.org/content/journals/10.1049/iet-opt.2018.5112 |
| Journal | IET Optoelectronics |
| Publisher Date | 2019-01-22 |
| Access Restriction | Open |
| Rights Holder | © The Institution of Engineering and Technology |
| Subject Keyword | Amplitude Modulation Ary Pulse-amplitude Modulation Background Noise Level Bandwidth Efficiency Channel Coding Channel Estimation Code Communication Channel Equalisation And Identification Conventional PAM Signalling Data-aided Channel Estimation Differential PAM Signalling Differential Pulse-amplitude Modulation Signalling Error Statistics Estimation Scheme Free Space Optical Link Free-Space Optical Communication Free-Space Optical System Improved Performance Instantaneous Channel Coefficient Interpolation And Function Approximation Laser Transmitters Modulation And Coding Method Numerical Analysis Optical Communication Optical Link Optical Modulation Perfect Channel Knowledge Pulse Amplitude Modulation Radio Link And Equipment Received PAM Symbols Signal Detection Signalling Scheme Statistics |
| Content Type | Text |
| Resource Type | Article |
| Subject | Atomic and Molecular Physics, and Optics Electrical and Electronic Engineering |
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