978-1-5386-2833-1/17/$31.00 ©2017 IEEE Digital Beamforming of Smart Antenna in Millimeterwave Communication Rahmad Hidayat Dept. of Electrical Engineering Sekolah Tinggi Teknologi Mandala Bandung 40286 rhidayat4000@gmail.com Rushendra, Ellisa Agustina Faculty of Computer Science & Engineering Mercubuana University Jakarta 11650 rushendra.rustam@gmail.com, ellisa.agustina@gmail.com Abstract—In this paper, a digital beamforming technique is studied which its transmitter model is designed for a 16-element linear phased array to a 256-element (16x16) rectangular phased array. First, its directivity is calculated. Base on the result, beam pattern characteristics are analyzed. Furthermore, the interference potential is compared by means the beamforming demo of millimeter waves against the microwave band used now. The simulation results demonstrate that the beam squint effect is relatively better at a higher frequency of millimeter wave band; the addition of directivity is in line to the increasing of the amount of the antenna array elements. Although, the potential of destructive interference is increasingly in the millimeters wave bands. Keywords—digital beamforming, beam squint, millimeter wave, directivity, beam pattern, smart antenna I. INTRODUCTION Nowadays, the increasingly diverse and expanding use of wireless and mobile service needs pushes smart antenna solutions for better transmission quality provision. Basically, mobile antenna design is valid for both base station and mobile terminal and antennas using the same principles and techniques can also be used for 4 th generation (LTE) and 5 th generation (5G).[1][2] Simultaneous optimization of antenna patterns (called beam) and massive MIMO (multiple input multiple output) precoding can be made possible through the beam-tilt feature of an active antenna system electronically. This process is known as beamforming. In general, it is being proposed at a beamforming design to optimize gain and allocation of antenna power in order to obtain the maximum weighted sum rate in multi-user active. [3] In this paper, two digital beamforming transmitter design simulation will be presented. which two spatial filters of the phased array antenna will be applied to result in beam pattern on the simulations by the perfect beam pattern considered by array processing premise. II. DIGITAL BEAMFORMING In a digital beamforming process, the use of multiple antennas on the sending side to form a total antenna radiation pattern will maximize a gain of the total antenna in direction of the mobile terminal. Increasing the received signal power can be obtained through this beamforming proportional to the number of sending antennas of at least eight elements. The implementation of the beam is then performed by applying different complex-value gains to different elements of the antenna array. Then by applying a different phase shift to the existing signal on different antennas, it can be done steering to the total beam generated.[4] A sensor array arrangement can be made in any form with the coordinates p = (px, py, pz) representing it. The signal acknowledged by each sensor will be the similar origin of the signal if a plane wave signal f (t, p) is incoming at a finicky position in space, and the point of each sensor in space is dissimilar.[5] (1) B(k) is the price of the beam pattern at a fastidious location in space with a complex weight w*n and v(k) as the array manifold vector; N is the quantity of the array elements; where k represents the wave number. If θ represent the angle of arrival as well as Ø for the angle of incoming wave azimuth, the next modify of variables can be prepared to illustrate B(k) in terms of the angle of occurrence : (2) With the beamforming of the directional signal of transmitting or receive antenna array can be controlled to produce the radiation pattern by adding the signal phase in the desired direction and by poses the nulling pattern for the undesirable direction, where the received signal optimization is done by phase adjustment and amplitude. The vector