Joint Beamforming and Power Control for Device-to-Device Communications Underlaying Cellular Networks

Abstract

In this paper, we address the issue of joint beamforming (BF) and power control (PC) for a device-to-device (D2D) communication underlaying cellular network (CN), where the wireless channels of D2D link and the base station (BS) to user equipment (UE) link experience Rician and correlated Rayleigh fading, respectively. Based on the property of the integral network, we first formulate a constrained optimization problem to minimize the total transmit power of the devices in the network, while meeting the quality-of-service (QoS) requirement of both the D2D and cellular users and suppressing the mutual interference to a certain level. Then, by adopting the available statistical channel state information (CSI) and proposing an approximation method to relax the constraints, a support vector machine (SVM) based algorithm is presented to solve the optimization problem for the transmit powers and BF weight vectors of each user. Furthermore, we derive the analytical expressions for the cumulative density function (CDF) and the generalized moments of the output signal-to-interference-plus-noise ratios (SINRs), thereby developing some novel theoretical formulas for the ergodic capacity (EC) and the average symbol error rate (ASER) of each user in the network. Finally, computer simulation results are provided to demonstrate the validity and efficiency of the proposed scheme as well as its performance analysis.Index Terms-Device-to-device communication, beamforming, power control, support vector machine. 0733-8716 (c)

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