Research Projects

This project investigates the integration of Cooperative Non-Orthogonal Multiple Access (NOMA) with Device-to-Device (D2D) communication and Intelligent Reflecting Surface (IRS) technology to enhance the performance of wireless communication networks. The combination of these three advanced technologies holds the potential to significantly improve spectral efficiency, energy efficiency, and network capacity, addressing the growing demands for high-speed, reliable communication in modern wireless systems.NOMA allows multiple users to share the same time-frequency resources by leveraging power-domain multiplexing. In cooperative NOMA, users cooperate with each other to improve system performance, with weaker users helping stronger users by relaying signals, thereby enhancing overall coverage and signal quality.D2D communication enables direct communication between devices without routing data through the base station. This reduces latency, improves spectrum efficiency, and supports localized data exchange, making it an attractive solution for high-density areas or scenarios with intermittent network connectivity.IRS is an innovative technology that uses a surface with a large number of reconfigurable elements to manipulate the wireless propagation environment. IRS can enhance the signal strength by reflecting signals in a controlled way, optimizing coverage and energy efficiency, especially in challenging wireless environments.Project Objectives: Enhance Spectral Efficiency: By integrating Cooperative NOMA with D2D and IRS, the system can accommodate more users on the same frequency resources, improving the overall spectral efficiency. Improve Coverage and Reliability: The cooperative nature of NOMA, when combined with the flexibility of D2D communication and the environmental adaptability of IRS, allows for better coverage and signal reliability, especially in areas with poor network infrastructure. Energy Efficiency: The use of cooperative relaying and IRS to direct and focus signals helps minimize energy consumption by reducing the need for power-hungry transmissions from base stations. Minimize Interference: Cooperative NOMA and IRS can work together to mitigate interference and optimize signal propagation paths, making the system more robust to interference from other users or devices. The project will develop a mathematical model that captures the interaction between users in a cooperative NOMA system, accounting for both direct and cooperative transmissions.The model will be extended to include D2D communication, where devices communicate directly, with selected devices acting as relays to enhance coverage and capacity. A performance optimization framework will be created that uses IRS to dynamically adjust the propagation environment to improve signal strength and quality. The IRS parameters will be optimized to minimize power consumption and maximize outage performance.