Optimization analysis demonstrates improved device-to-device transmission rates in energy-harvesting relay networks, indicating viable spectrum sharing without cellular degradation.
Key Points
To maximize underlay device-to-device (D2D) transmission rates by jointly optimizing transmit powers and the relay power-splitting ratio without degrading existing cellular network throughput.
Modeled an underlay D2D link within a SWIPT-enabled two-hop decode-and-forward relay network where the D2D transmitter supplies both information and cancelable energy signals.
Transformed the non-convex rate-maximization problem into an equivalent tractable optimization problem to obtain globally optimal closed-form solutions and an asymptotic upper bound.
The optimized closed-form power allocation guarantees performance that meets or exceeds conventional baselines, maintaining positive D2D transmission rates even when baseline schemes fail.
Numerical evaluations validated that the proposed joint optimization substantially increases D2D data rates while strictly preserving end-to-end cellular rates.