Exact SER Analysis of Partial-CSI-Based SWIPT OAF Relaying over Rayleigh Fading Channels and Insights from a...

Area of Science:

• Wireless Communication Engineering
• Information Theory
• Signal Processing

Background:

• Simultaneous Wireless Information and Power Transfer (SWIPT) systems are crucial for energy-efficient wireless networks.
• Opportunistic Amplify-and-Forward (OAF) relaying enhances system performance in fading channels.
• Power Splitting (PS) is essential for balancing data transmission and energy harvesting in SWIPT relays.

Purpose of the Study:

• To investigate the Symbol Error Rate (SER) performance of SWIPT-OAF systems under Rayleigh fading.
• To provide analytical expressions for SER based on system parameters like power splitting ratio (ρ) and link quality.
• To develop a novel approximation for performance analysis and extend the framework to practical scenarios.

Main Methods:

• Derivation of exact and asymptotic SER expressions using Moment-Generating Function (MGF) methods.
• Development of an approximation to model SWIPT-OAF as an equivalent non-SWIPT OAF system.
• Extension of the analysis to include partial Channel State Information (CSI) and Nth best relay selection.

Main Results:

• Analytical insights into the impact of power splitting ratio and link quality on SER.
• A tractable approximation that maintains key diversity characteristics of the system.
• Validation of theoretical analysis through extensive simulations across various Signal-to-Noise Ratio (SNR) and channel conditions.

Conclusions:

• The proposed methods offer a flexible and scalable design strategy for SWIPT-OAF relay systems.
• The findings are applicable to emerging wireless sensor and Internet of Things (IoT) networks.
• The study demonstrates the robustness of the analytical and approximation frameworks.