Fig. 9From: Energy efficiency and sum rate tradeoffs for massive MIMO systems with underlaid device-to-device communications a ASR [Mbit/s] and b EE [Mbit/Joule] as a function of the D2D user density λ d for different D2D transmit power and a fixed ratio \(\frac {T_{c}}{U_{c}}= 5\) with the number of CUEs U c ∈{1,14}Back to article page