Downlink Cooperative Broadcast Transmission Based on Superposition Coding in a Relaying System for Future Wireless...

Area of Science:

• Wireless communication systems
• Information theory

Background:

• Traditional orthogonal schemes in relaying broadcast channels (RBCs) face limitations in resource utilization.
• Relaying in wireless networks often incurs a half-duplex penalty, reducing spectral efficiency.

Purpose of the Study:

• To investigate the superiority of cooperative broadcast transmission over traditional orthogonal schemes in downlink RBCs.
• To evaluate two novel cooperative broadcast protocols utilizing amplify-and-forward (AF) and decode-and-forward (DF) relays.

Main Methods:

• Development of theoretical outage probability expressions for AF and DF relay protocols.
• Utilization of superposition coding (SupC) for simultaneous transmission of private user messages.
• Numerical simulations to determine minimum total power consumption for given traffic requirements.

Main Results:

• Cooperative broadcast transmission with AF and DF relays demonstrates improved outage performance compared to orthogonal schemes.
• Significant power gains are achieved, indicating enhanced energy efficiency.
• Superposition coding enables resource reuse and alleviates the half-duplex penalty.

Conclusions:

• Cooperative broadcast transmission offers superior performance in RBCs, achieving better outage probabilities.
• The proposed protocols provide considerable power savings, making them energy-efficient solutions.
• SupC-based cooperative strategies are essential for enhancing the efficiency of future wireless broadcast systems.