Subcarrier Allocation Based Cooperative Spectrum Sharing with Wireless Energy Harvesting in OFDM Relaying Networks.

Area of Science:

• Wireless communication
• Signal processing
• Energy harvesting

Background:

• Cognitive relay nodes (CRNs) in Orthogonal Frequency Division Multiplexing (OFDM) networks face challenges in spectrum access and energy management.
• Cooperative spectrum sharing protocols are crucial for efficient utilization of licensed spectrum by unlicensed cognitive systems.

Purpose of the Study:

• To propose a novel subcarrier allocation-based cooperative spectrum sharing protocol for OFDM relaying networks incorporating wireless energy harvesting.
• To maximize the cognitive transmission rate while ensuring the primary system's target transmission rate is met.

Main Methods:

• The protocol involves a two-phase approach where the CRN decodes information and harvests energy, then utilizes harvested energy to forward signals on disjoint subcarriers.
• Optimization of power splitting ratio, power allocation, and subcarrier allocation is performed to achieve the study's objectives.

Main Results:

• The proposed protocol enables cognitive systems to access spectrum by intelligently allocating subcarriers for forwarding primary and cognitive signals.
• Numerical and simulation results demonstrate the effectiveness of the cooperative spectrum sharing protocol and highlight the impact of various system parameters.

Conclusions:

• The developed subcarrier allocation-based cooperative spectrum sharing protocol effectively enhances cognitive transmission rates in OFDM relaying networks with energy harvesting.
• The findings provide valuable insights into optimizing resource allocation for improved performance in cognitive wireless networks.