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This work considers the downlink of a cloud radio access network (C-RAN) in which a baseband processing unit (BBU) sends independent messages to multiple user equipments (UEs) by controlling a set of remote radio heads (RRHs) which are connected to the BBU via finite-capacity fronthaul links. In standard C-RAN systems, it is prescribed that the fronthaul links are used in a soft-transfer mode whereby...
A flying ad hoc network (FANET) that consists of multiple unmanned aerial vehicles (UAVs) is a promising technology for future networked systems. In this paper, we study a way to construct a topology for the FANET that guarantees end-to-end communication between the ground control station (GCS) and each mission UAV that performs its given task via optimizing the locations of the relay UAVs. To this...
In this paper, we propose a subspace method for solving unconstrained optimization problems without derivatives. In each iteration, we construct a subspace, which enables a large-scale unconstrained optimization problem to be transformed into a lower dimensional subproblem. This paper describes how to use polynomial interpolation model to capture the information of function and its derivatives, and...
This paper considers a wireless power transfer system with multiple antennas by using the multicarrier signal waveforms. A prior art optimizes the waveform with the channel state information at the transmitter (CSIT) to improve the energy harvesting efficiency of the receiver with the non-linear model. The impact of the imperfect CSIT on the energy harvesting capability is studied as a function of...
While many companies have launched various wireless chargers in mobile industries, conventional wireless power transfer (WPT) technologies are available only for a very short distance due to large attenuation of the magnetic fields. A magnetic beamforming WPT system achieves an enhanced power transfer efficiency (PTE) with a longer wireless charging distance than conventional WPT technologies by adjusting...
The transmission structure of quadrature spatial modulation (QSM) restricts the signal constellation to be lattice style. Meanwhile, both the minimum amplitude and minimum Euclidean distance (MED) in quadrature and in-phase domain should be taken into account for the constellation design of QSM. In this paper, a non-uniform lattice constellation is designed for quadrature spatial modulation (QSM),...
Texture reconstruction is the last step of 3D reconstruction pipelines that makes 3D geometry models very impressive and beautiful. Once the 3D model is created through structure-from-motion, multi-view stereo and mesh reconstruction, real image based texture is mapped to the models. But it is not easy to generate high quality texture. There are many difficulties cause problems: the large number of...
The resource constraint is one of the top issues in the Internet of Things network. All activity in the network node should be carefully designed and managed to support the resource efficiency of the network. Hence, an energy efficient transceiver like ZigBee is popularly used as the infrastructure for the Internet of Things edge network. This paper presents our method for efficient ZigBee router...
Efficient code descriptions of rate compatible polar codes are studied. An efficient code description method, so-called the polarization weight sequence that defines multiple codewords, was proposed in 3GPP standardization. We verify the validity of the method for various environments. We assess the performance degradation under successive cancellation (SC) decoding and SC list decoding compared with...
Vehicular Ad Hoc Networks (VANET) have become one of the most important research areas for the successful and deployment of intelligent transportation system and the unmanned vehicle technologies. In VANET, Travel Prediction-based Data Forwarding (TPD) was proposed as one of novel data forwarding schemes based on road traffic statistics. However, the TPD could not guarantee good performance in the...
A parameter optimization scheme of block interleaver for polar coding with bit-interleaved coded modulation (BICM) is proposed in this paper. We analyze the characteristics of a random interleaver applied to polar codes with high-order modulation, which is ideal but infeasible to implement. Then we derive the parameter optimization algorithm of block interleaver for polar coding with BICM. The block...
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