Joint Power Control and Phase Shift Design for Future PD-NOMA IRS-Assisted Drone Communications under Imperfect SIC Decoding
Abstract
:1. Introduction
- A downlink PD-NOMA system is considered that consists of multiple drones, multiple IRSs, and IoT devices, where each drone in its coverage area communicates with IoT devices through direct and IRS-assisted links. Due to large objects in urban areas, IRSs are mounted on strategic positions to assist the signal delivery from drones to IoT devices. To maximize the spectral efficiency of the system, each drone shares the same spectrum resources. Thus, IoT devices in the coverage area of one drone receive interference from neighboring drones. Besides that, IoT devices in the same coverage area also cause PD-NOMA interference. Moreover, interference due to imperfect SIC also exists in the system. Therefore, the objective of this framework is to enhance the sum capacity of the system through efficient resource allocation.
- The problem is formulated to enhance the sum capacity maximization of the system subject to quality of services and other practical constraints. In particular, the proposed approach simultaneously optimizes the transmit power budget of drones, PD-NOMA power allocation for IoT devices, and phase shift design of IRSs. Due to the non-convex nature of the formulated problem, computing optimal solution directly is very challenging. To make it tractable and reduce the complexity, we first divide the joint problem into subproblems and then obtain an efficient solution. For power allocation subproblem, we adopt a Lagrangian method based on KKT conditions where dual variables are updated iteratively. Next, for efficient phase shift design, we employ successive convex approximation and the DC programming method.
- To validate the proposed solution, numerical results are provided to check the system’s performance with respect to different optimization variables. For better analysis, we compare the proposed solution with benchmark solutions such as a solution with perfect SIC decoding, a solution without IRS, and a solution where only long-distance IoT device signals can be assisted by IRS. The results demonstrate that the proposed approach outperforms the benchmark solutions in the sum capacity maximization of the system. Moreover, our approach contain very low complexity and converges within a few iterations.
Recent Literature
2. System Model and Problem Formulation
3. Proposed Optimization Solution
3.1. Efficient Power Allocation
3.2. Efficient Phase Shift Design
4. Numerical Results and Discussion
5. Conclusions
Author Contributions
Funding
Institutional Review Board Statement
Informed Consent Statement
Data Availability Statement
Conflicts of Interest
Appendix A. γ 0, γ 1, γ 2, γ 3, γ 4, and γ 5
Appendix B. φ 0, φ 1, φ 2, and φ 3
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Notation | Definition |
---|---|
U | Set of drones |
u | Drone index |
Phase shift matrix of IRS | |
Amplitude of passive reflection of IRS element | |
Phase shift of IRS element | |
x | Transmitted superimposed signal of drone |
v | Passive element of IRS |
Index IoT devices | |
Q | Power budget of drone |
PD-NOMA power allocation coefficient | |
h | Channel between drone and IRS |
Reference channel gain over 1 meter | |
2D coordinate of drone | |
Location of IRS and IoT devices on horizontal plane | |
H | Altitude of drone |
g | Channel between IRS and IoT devices |
G | Rayleigh fading coefficient |
D | Distance between IRS and IoT device |
y | Received signal at IoT device |
Additive white Gaussian noise | |
C | Capacity of IoT device |
Co-channel interference | |
Minimum capacity of IoT devices | |
Maximum power budget of IoT device | |
Lagrangian function | |
Vector of Lagrangian multipliers | |
Lagrangian multiplier |
Parameter | Definition |
---|---|
Number of drones | 10 |
Number of IoT devices | 10 |
Number of IRSs | 10 |
Imperfect SIC parameter | 0.1 |
Monte Carlo simulation | 1000 |
IRS passive elements | 50 |
Power budget of each drone | 30 |
Path loss exponent | 3 |
Additive white Gaussian noise | 0.01 |
Altitude of drone | 80 |
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Aziz, S.; Irshad, M.; Afef, K.; Mohamed, H.G.; Alotaibi, N.; Tarmissi, K.; Alnfiai, M.M.; Hamza, M.A. Joint Power Control and Phase Shift Design for Future PD-NOMA IRS-Assisted Drone Communications under Imperfect SIC Decoding. Sensors 2022, 22, 8603. https://doi.org/10.3390/s22228603
Aziz S, Irshad M, Afef K, Mohamed HG, Alotaibi N, Tarmissi K, Alnfiai MM, Hamza MA. Joint Power Control and Phase Shift Design for Future PD-NOMA IRS-Assisted Drone Communications under Imperfect SIC Decoding. Sensors. 2022; 22(22):8603. https://doi.org/10.3390/s22228603
Chicago/Turabian StyleAziz, Saddam, Muhammad Irshad, Kallekh Afef, Heba G. Mohamed, Najm Alotaibi, Khaled Tarmissi, Mrim M. Alnfiai, and Manar Ahmed Hamza. 2022. "Joint Power Control and Phase Shift Design for Future PD-NOMA IRS-Assisted Drone Communications under Imperfect SIC Decoding" Sensors 22, no. 22: 8603. https://doi.org/10.3390/s22228603