Research Article
Energy-Spectral Efficiency Optimization in Wireless Underground Sensor Networks Using Salp Swarm Algorithm
| Symbol | Definition |
| | Battery power capacity of node | | Total number of transmissions that can be performed over the link | | Power used to transmit a packet | | UG2UG Rayleigh distributed channel between and | | UG2AG Rayleigh distributed channel between and | | Zero-mean complex Additive White Gaussian Noise (AWGN) vector with power spectral density | | System bandwidth | | Amplification factor | | UG2UG path loss | | UG2AG path loss composed by the path losses at the underground and the aboveground portions and | | Minimum power allowed for each transmission | | Maximum power allowed for each transmission | | Optimal power of node | | Remaining battery capacity of node at | | Total SNR of the link | | Maximum achievable total transmission data rate of the link | | Energy efficiency of the link | | Spectral efficiency of the link | | Resource efficiency of the link |
|
|