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Allowing a Device-to-Device (D2D) communication mode in a cellular network is a feature that might improve the system performance due to a better (re)use of radio resources and a reduced congestion when several users located at the same area want to communicate with each other. The design of an efficient D2D communication mode with minimal interference to the cellular network is a key problem for future communication systems. In this work, we study the impact of the distance between communicating and interfering nodes and illustrate the benefits of D2D communication in a cellular network by comparing its performance in terms of total rate with that of a conventional cellular communication mode. The obtained results show that the use of D2D communication might provide considerable gains, but strongly depends on the distances among the involved nodes.

Abstract-This work analyses the effects of multipath diversity on the performance of wireless code division multiple access (CDMA) ad hoc networks. Expected progress per slot is used as the performance criterion for the capacity of the described model. The fading can unfavorably affect the data transmission in an wireless network. By the application of the well known rake receiver for CDMA systems, it is shown that multipath diversity significantly increases the CDMA ad hoc network performance, decreasing the harmful effects of the fading.

New technologies have emerged to attend the increasing data rates demanded by multimedia services in wireless communication systems. In this context, Device-to-Device (D2D) communication appears as promising feature to improve data rates and increase spectral efficiency of wireless systems. Moreover, its combination with power control, which enables lowpower communication among devices and contributes to reduce interference, can enhance even more such benefits in future wireless systems. In this work, we investigate the leverage of the uplink power control on the D2D communication underlaying cellular networks. The results show that the D2D communication applied together with power control can overcome cellular mode performance in terms of sum rate.

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