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Network densification will produce frequent handover for mobile users, which could largely diminish the densification gain. We develop a comprehensive analytical model for the handover rate in K-tier heterogeneous cellular networks, where each tier is modeled as an independent Poisson point process with unique transmit power, path-loss exponent, spatial density, and association bias. The spatial randomness...
Hybrid multiple-input multiple-output (MIMO) systems have been thought as a promising technology in future 5G. Compared with conventional digital MIMO systems, such a structure is equipped with fewer RF chains, which would reduce the computational complexity and hardware cost, and meanwhile additional analog beamforming is introduced to maintain the performance. However, scarce RF chains make channel...
With the booming of e-commerce, salerooms of online shops have affected the offline shops marketing severely. It requires a smart system to help dealers to predict the products sale trend, so as to save cost for their entity business. In this paper, we propose an interactions data detection system based on RFID technology. The customers' behavior information reflected by Received Signal Strength Indicator...
In this paper, we study the low-complexity channel reconstruction methods for downlink precoding in massive MIMO systems. When the user is allocated less streams than the number of its antennas, the BS or user usually utilizes the singular value decomposition (SVD) factorizations to get the effective channels, whose dimension is equal to the num of streams. This process is called channel reconstruction...
Abstract-This paper presents a design of multi-wave pulse power based on FPGA. The main circuit is made up of step-down transformer, PWM rectifier and filter ,step-down chopper, waveform conversion .In order to solve the serious distortion of current of pulse power ,three-phase PWM high power factor rectifier circuit is used .The control circuit is EP1C6 development system ,with VHDL programming ,...
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