Capacity Optimization for RSMA-Based Multi-User System over Underwater Turbulence Channel
Abstract
:1. Introduction
2. System Model
3. Underwater Channel Model
3.1. Oceanic Turbulence Model
3.2. Pointing Errors Model
3.3. Attenuation Model
3.4. Joint Fading Channel Model
4. Channel Simulation and System Performance Analysis
4.1. Channel Simulation
4.2. Ergodic Capacity
4.3. Outage Probability
4.4. Joint Optimization of RASM and Power Allocation Algorithm
Algorithm 1 JO algorithm: | |
Initialize: N and Pt, Pmin ≤ Pt ≤ Pmax; | |
1: | According to (24), calculate ap,i, ap,j, i, j∈{1, …, N}, i ≠ j; |
2: | Satisfy , obtain ac; |
3: | Based on (25), obtain Pi, Pc; |
4: | Set Pout, Determine Rmin and the SINR range for each user based on (22); |
5: | According to , optimization variables of (23a) reduce to the power allocation using CVX tool until convergence, i.e., ap,i, ac, Rp,i, Rc. |
5. Numerical Results and Discussions
6. Conclusions
Author Contributions
Funding
Institutional Review Board Statement
Informed Consent Statement
Data Availability Statement
Acknowledgments
Conflicts of Interest
References
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Water | Argo Node ID | Longitude | Latitude | Location |
---|---|---|---|---|
1 | 4902602 | −64.587 | 72.253 | Arctic ocean frigid zone |
2 | 2902878 | 156.977 | 39.616 | Pacific temperate zone |
3 | 6990505 | 53.498 | −12.681 | East African coastal tropical zone |
Parameter Name | Symbol | Value |
---|---|---|
Minimum transmission power | Pmin | 30 mW |
Maximum transmission power | Pmax | 200 mW |
Electronic charge | q | 1.602 × 10−19 C |
OBPF bandwidth | 30 nm | |
Optical filter transmissivity | TF | 0.95 |
Half-angle view field | 30° | |
Receiver effective bandwidth | B | 100 MHz |
Excess noise factor | FA | 0.5 |
Receiving aperture radius | Rrx | 10 cm |
Seawater depth at which user receiver is deployed | D | 40 m |
O/E conversion efficiency of APDs | ηr | 0.6 |
E/O conversion efficiency of LDs | ηt | 0.5 |
APD responsivity | 0.8 A/W | |
Initial beam waist | W0 | 5 cm |
Communication coverage radius | R | 30 m |
Number of LDs | Nt | 6 |
Number of APDs for each user | Nr | 1 |
Optical wavelength | λ | 532 nm |
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Wang, J.; Yin, H. Capacity Optimization for RSMA-Based Multi-User System over Underwater Turbulence Channel. J. Mar. Sci. Eng. 2024, 12, 1526. https://doi.org/10.3390/jmse12091526
Wang J, Yin H. Capacity Optimization for RSMA-Based Multi-User System over Underwater Turbulence Channel. Journal of Marine Science and Engineering. 2024; 12(9):1526. https://doi.org/10.3390/jmse12091526
Chicago/Turabian StyleWang, Jianying, and Hongxi Yin. 2024. "Capacity Optimization for RSMA-Based Multi-User System over Underwater Turbulence Channel" Journal of Marine Science and Engineering 12, no. 9: 1526. https://doi.org/10.3390/jmse12091526