Average Sum Rate and Energy Efficiency for D2D Communication Underlaid Cellular Networks

Device-to-Device (D2D) communication has been recognized as one of the key technologies to improve the data rate and reduce the power consumption. In D2D communication, two nearby mobile users establishes the direct link for communication without involving the network infrastructure. A wireless communication with high data rate increases the energy consumption and greenhouse gas emission. To resolve these issues, the D2D communication underlaid cellular network over Nakagami-m fading has been proposed in this paper. In underlaid in-band D2D communication, the licensed frequency bands of cellular network are reused by D2D communication. This introduces additional interference that affect the quality of service but increases the spectral efficiency with low power consumption. The D2D users transmit to their paired receiver by reusing the uplink resource of the cellular network. Average sum rate (ASR) and energy efficiency (EE) have been analyzed for D2D communication underlaid cellular networks. The poisson point process (PPP) and stochastic geometry have been utilized to characterize the random distribution of user equipment. The expressions derived for ASR and EE show the variation over cellular to BS distance, D2D pair distance, and Nakagami fading parameter. The results from this analysis provide a desirable system design parameters that offer the best gains in terms of ASR and EE.