Atmospheric turbulence mitigation of MIMO-RF/FSO DWDM communication systems using advanced diversity multiplexing with hybrid N-SM/OMI M-ary spatial pulse-position modulation schemes.
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| Title: | Atmospheric turbulence mitigation of MIMO-RF/FSO DWDM communication systems using advanced diversity multiplexing with hybrid N-SM/OMI M-ary spatial pulse-position modulation schemes. |
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| Authors: | Elsayed, Ebrahim E.1 (AUTHOR) engebrahem16@std.mans.edu.eg |
| Source: | Optics Communications. Jul2024, Vol. 562, pN.PAG-N.PAG. 1p. |
| Subjects: | Free-space optical technology, Telecommunication systems, Bit error rate, Optical communications, Multiplexing, Wireless communications, Atmospheric turbulence |
| Abstract: | This paper introduces an assessment framework for the effectiveness of free-space optical (FSO) communication systems that combine multilevel modulation with the use of orbital angular momentum (OAM) for data stream multiplexing to enhance system bandwidth efficiency. The proposed system integrates pulse-position modulation (PPM) and dense wavelength-division multiplexing (DWDM) while addressing challenges from optical nonlinearity and atmospheric disturbances. This work aims to refine FSO deployment by merging N-encoded adaptive spatial modulation (SM) with L-ary spatial PPM (SPPM) and by adopting a diversity approach that utilizes both multiple-input multiple-output (MIMO) and multiple-input single-output (MISO) configurations in an M-to-1 ratio. The inclusion of SM in FSO communications alleviates signal degradation caused by atmospheric turbulence, yielding a significant reduction in the bit error rate (BER) compared to other systems. The proposed configuration of 2-SM/4-SPPM combined with a 2 × 1 MISO setup achieves a BER of 10 ‐ 9 for a high-capacity communication range of 2 km, and a 4 × 4 MIMO OAM in FSO at a BER of 10 ‐ 9 for a 200-m high-capacity free-space optical link, demonstrating promising results. Additionally, the system utilizes sequential signal relay and an advanced form of PPM to compensate for atmospheric and alignment-related signal losses, thereby extending the potential reach of FSO communication. Numerical analysis confirms that the system setup, which features a greater mode spacing of 2 units for OAM +1, +3, +5, and +7 modes, is less affected by power penalties due to interchannel interference and maintains stable performance even with lateral displacements of up to 0.75 mm. When comparing systems with different antenna array sizes, specifically 8 × 8 and 4 × 4, the capacity of all three systems is greater with the larger 8 × 8 antenna array. This study introduces an innovative approach that integrates advanced diversity multiplexing techniques with hybrid DWDM, incorporating N-encoded SM/SPPM. To enhance the system's robustness, the optical modulation index (OMI) is meticulously optimized within the advanced diversity multiplexing framework, employing hybrid MIMO N-SM/SPPM modulation schemes for FSO OAM communication systems. The approach is tailored to specifically counteract the impact of atmospheric turbulence. Simulation results underscore a marked enhancement in the signal's stability and integrity, charting the course for high-capacity, resilient optical wireless communications that can effectively navigate the challenges posed by atmospheric turbulence. These findings lay the groundwork for a theoretical capacity framework for OMI/OAM-based hybrid MIMO/MISO communication networks. The numerical results also indicate that the throughput of OAM-enhanced MIMO systems surpasses that of conventional MIMO configurations beyond a certain distance threshold. This study is significant in improving last-mile Internet services and backhaul connections. • Proposed hybrid modulation enhances system in all conditions, boosting efficiency and reliability. • Study introduces approach merging diversity techniques with hybrid DWDM-FSO, incorporating N-encoded SM/SPPM. • Findings lay groundwork for theoretical capacity framework for OMI/OAM-based hybrid MIMO/MISO FSO communication network. • Combining OAM, MIMO, RF-DWDM, and advanced modulation schemes aims to enhance FSO system performance. • The study suggests using Hybrid DWDM, SCM, and SPPM modulation to boost system performance in varied conditions. [ABSTRACT FROM AUTHOR] |
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| Database: | Engineering Source |
| Abstract: | This paper introduces an assessment framework for the effectiveness of free-space optical (FSO) communication systems that combine multilevel modulation with the use of orbital angular momentum (OAM) for data stream multiplexing to enhance system bandwidth efficiency. The proposed system integrates pulse-position modulation (PPM) and dense wavelength-division multiplexing (DWDM) while addressing challenges from optical nonlinearity and atmospheric disturbances. This work aims to refine FSO deployment by merging N-encoded adaptive spatial modulation (SM) with L-ary spatial PPM (SPPM) and by adopting a diversity approach that utilizes both multiple-input multiple-output (MIMO) and multiple-input single-output (MISO) configurations in an M-to-1 ratio. The inclusion of SM in FSO communications alleviates signal degradation caused by atmospheric turbulence, yielding a significant reduction in the bit error rate (BER) compared to other systems. The proposed configuration of 2-SM/4-SPPM combined with a 2 × 1 MISO setup achieves a BER of 10 ‐ 9 for a high-capacity communication range of 2 km, and a 4 × 4 MIMO OAM in FSO at a BER of 10 ‐ 9 for a 200-m high-capacity free-space optical link, demonstrating promising results. Additionally, the system utilizes sequential signal relay and an advanced form of PPM to compensate for atmospheric and alignment-related signal losses, thereby extending the potential reach of FSO communication. Numerical analysis confirms that the system setup, which features a greater mode spacing of 2 units for OAM +1, +3, +5, and +7 modes, is less affected by power penalties due to interchannel interference and maintains stable performance even with lateral displacements of up to 0.75 mm. When comparing systems with different antenna array sizes, specifically 8 × 8 and 4 × 4, the capacity of all three systems is greater with the larger 8 × 8 antenna array. This study introduces an innovative approach that integrates advanced diversity multiplexing techniques with hybrid DWDM, incorporating N-encoded SM/SPPM. To enhance the system's robustness, the optical modulation index (OMI) is meticulously optimized within the advanced diversity multiplexing framework, employing hybrid MIMO N-SM/SPPM modulation schemes for FSO OAM communication systems. The approach is tailored to specifically counteract the impact of atmospheric turbulence. Simulation results underscore a marked enhancement in the signal's stability and integrity, charting the course for high-capacity, resilient optical wireless communications that can effectively navigate the challenges posed by atmospheric turbulence. These findings lay the groundwork for a theoretical capacity framework for OMI/OAM-based hybrid MIMO/MISO communication networks. The numerical results also indicate that the throughput of OAM-enhanced MIMO systems surpasses that of conventional MIMO configurations beyond a certain distance threshold. This study is significant in improving last-mile Internet services and backhaul connections. • Proposed hybrid modulation enhances system in all conditions, boosting efficiency and reliability. • Study introduces approach merging diversity techniques with hybrid DWDM-FSO, incorporating N-encoded SM/SPPM. • Findings lay groundwork for theoretical capacity framework for OMI/OAM-based hybrid MIMO/MISO FSO communication network. • Combining OAM, MIMO, RF-DWDM, and advanced modulation schemes aims to enhance FSO system performance. • The study suggests using Hybrid DWDM, SCM, and SPPM modulation to boost system performance in varied conditions. [ABSTRACT FROM AUTHOR] |
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| ISSN: | 00304018 |
| DOI: | 10.1016/j.optcom.2024.130558 |
