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For simulations of multiple-input multiple-output (MIMO) narrowband channel between the Unmanned Aerial Vehicle (UAV) and the ground user, we describe the distribution of scatterers by using a cylindrical model, and propose a corresponding deterministic simulation model and a statistical simulation model. In order to verify the practicability of the simulation model, this paper compares the temporal...
In this paper. High performance quiet zone of CATR is designed and implemented. The size of quiet zone is 1.2m × 1.2m × 1.2m with prime feed offset 3 meters reflector. The cross-pol plane wave is −60 dB at boresight beam direction. The operating frequency of this CATR is from 10 GHz to 40 GHz. The power budget of CATR is analyzed for low cross-pol antenna measurement. Both results of simulation and...
Both bunching and anti-bunching phenomenon of photons can be obtained controllably in this system by tuning the driving lasers. We can also distinguish photons with these two different statistics by two orthogonal cavity modes, which can be designed as integrated light source devices.
In this paper, we investigate the relay selection (RS) problem in power splitting (PS) based energy- harvesting (EH) half-duplex (HD) relay networks, where the relays are wirelessly powered by harvesting a portion of the received RF signal power. We expand the relay selection problem in PSEH-HD relay networks to allow multiple relays to cooperate simultaneously. Furthermore, the optimal PS factor...
Vehicular ad-hoc networks (VANETs), as an important component of intelligent transportation systems (ITS), have been attracting more and more research interests for their various promising applications. Although various MAC protocols have been proposed, efficient medium access remains a significant challenge in VANETs, especially in improving the network throughput in heavy traffic vehicular networks...
Recently, the use of unmanned aerial vehicle (UAV) is going to receive great interest in various areas. As a newly emerging area, UAV-aided communications encounter unique communication scenarios and thus need corresponding UAV channel models for better design of such UAV communication systems. In this paper, we propose a three-dimensional (3D) sphere UAV air-to-ground (A2G) multiple-input-multiple-output...
In this paper, we extend the idea of Index modulated orthogonal frequency division multiplexing (IM-OFDM) to the MIMO scenario and propose the precoded index modulation for multi-input multi-output OFDM (PIM- MIMO-OFDM) for downlink transmission. Based on the channel state information (CSI) at the transmitter, PIM-MIMO-OFDM jointly selects the active elements of the receiver-side space-frequency OFDM...
Piezoresistive strain gauges are usually used to measure position and displacement for MEMS scanning mirrors with torsional silicon bars, but this method cannot be applied to gimbal-less 2-axis electrothermal bimorph micromirrors since they do not have torsional silicon bars. This paper reports an integrated optoelectronic position sensor (iOE-PS) that can measure the linear displacement and tilting...
Distributed storage systems (DSSs) are widely employed in data centers and sensing networks to resist storage node failures. Structured redundancy is introduced to DSS by various coding schemes to efficiently account for failures of storage nodes. The allocation of the coded data blocks to storage nodes is another factor that impacts the data reliability. In this paper, we investigate the coding and...
In this paper, an effective low complexity generalized spatial modulation (GenSM) scheme with transmit antenna grouping is proposed for massive multi-input multi-output (MIMO) system to deal with the channel correlation among transmit antennas. In the proposed scheme, all transmit antennas are divided into several equal-sized groups, and spatial modulation (SM) is carried out to select one active...
In this paper, we investigate the physical layer security issue in a cellular network with a full-duplex (FD) base station and multiple uplinks and downlinks. We provide a novel cooperative jamming mechanism in order to enhance the secrecy performance for the investigated scenario. The total bandwidth is divided into multiple resource blocks (RBs). In our investigation, each uplink or downlink can...
Aiming at the problem of vibration detection in the factory production line, a dynamic angular displacement detection method based on laser displacement sensor is proposed. This article takes the air conditioner as an example. The dynamic angular displacement detection method is used to detect the dynamic angular displacement of a certain point of the air conditioning external unit. The results show...
Unmanned Aerial Vehicles (UAVs) have been a promising platform in realizing high-speed wireless networks. As an emerging scenario, the UAV communication is distinct from widely used cellular systems or vehicular networks, requiring the development of practical yet easy-to-use channel models. In this paper, for the first time we introduce the geometry-based stochastic model (GBSM) to UAV channel modeling,...
This paper proposes a balancing strategy to improve the balancing performance of series-connected lithium-ion batteries. The key point of the proposed strategy is to control the change rate of state of charge (SOC) of different batteries to be equal so that imbalance can be prevented from emerging and expanding. With this strategy, the discrepancy of real maximum capacity in aged batteries can be...
Antenna subset modulation has been proposed as a physical layer security technique for millimeter-wave (mmWave) wireless communications. In antenna subset modulation, the transmitter selects a subset of antennas at the symbol rate to differ the sidelobes of the nonuniform arrays in undesired directions and orients the mainlobe in the target direction by steer beamforming. In this paper, we propose...
Subcarrier assignment plays a key role in energy efficient resource allocation for uplink Orthogonal Frequency Division Multiple Access (OFDMA) networks since the optimal power allocation with a given subcarrier assignment can be easily obtained. Existing subcarrier assignment algorithms with acceptable performance need high computational complexity. In this paper, we aim to reduce the complexity...
An optimized relaying method for multi-antennas cooperative networks, estimate-and-forward (EF) strategy for MIMO relay, is proposed and analyzed in this paper. According to our theoretical analysis, it performs like amplify-and-forward (AF) for the low signal noise ratio (SNR) region and behaves like detect-and-forward (DF) for the high SNR region. For the relay networks with a large number of antennas...
In this paper, we investigate the flexible power transfer among electric vehicles (EVs) from a cooperation perspective in an energy Internet based EV system. First, we introduce the concept of cooperative EV-to-EV (V2V) charging, which enables active cooperation via charging/discharging operations between EVs as energy consumers and EVs as energy providers. Then, based on the cooperative V2V charging...
In this paper, we investigate the optimization of the power splitting factor and the relay selection problem in two-way full-duplex (FD) relay networks, where the relays are wirelessly powered by harvesting a portion of the received signal power from the sources. To the best of the authors' knowledge, this is the first time that the two-way FD relays with simultaneous wireless and information transfer...
In recent years, the capacity and charging speed of batteries have become the bottleneck of mobile communications systems. With the development of wireless power transfer technologies, simultaneous wireless information and power transfer (SWIPT) becomes a possible alternative. Due to the limitations of practical circuit implementation, the energy harvesting circuit cannot directly decode the information...
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