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This paper investigates the outage performance of cognitive broadband satellite systems and terrestrial cellular network in millimeter wave (nunWave) scenario. Considering the state-of-art standard recommendations and nun Wave propagation model, we first define a general framework for the coexistence of broadband satellite system and terrestrial cellular networks with distinct geometry, configuration,...
This paper investigates the secrecy performance of a multi-antenna land mobile satellite (LMS) communication system in the presence of an eavesdropper who wants to overhear the confidential message. Specifically, considering the active eavesdropping scenario, namely, the eavesdropper's CSI is available to the satellite, we derive the closed-form expression for the average secrecy capacity of the LMS...
In this paper, we study the secrecy performance of a cellular network, where a device-to-device (D2D) communication shares the spectral resources with a multi-antenna base station (BS). By assuming known the channel state information (CSI) of the legitimate user and using the maximal ratio transmission (MRT) at the BS, we first derive a closed-form expression of the ergodic secrecy capacity (ESC)...
Emboli generated in cardiac surgery can result in many postoperative neurological complications. There are many methods to reduce the amount of emboli or to block them. Nevertheless, many of methods have limitation. In this study, ultrasonic radiation force generated by phased array ultrasound is used to block emboli and the blocking effect is evaluated. We do vivo experiment on eight pigs (40kg)...
The integration of cognitive radio (CR) into satellite networks is recognized as an effective strategy to enhance the efficiency of radio spectrum. This paper investigates the ergodic capacity of a multiple antenna cognitive satellite terrestrial network, where the secondary terrestrial system can coexist with the primary satellite system as long as the interference imposed from the secondary user...
This paper investigates the secrecy performance of a land mobile satellite (LMS) communication system, where a satellite communicates with a legitimate receiver in the presence of an eavesdropper who wants to eavesdrop the confidential message. By using the Meijer-G functions, the analytical expressions for the probability of non-zero secrecy capacity and the exact secrecy outage probability are first...
This paper investigates the secrecy capacity of a multi-antenna amplify-and-forward (AF) hybrid satellite-terrestrial relay netwrok (HSTRN), which consists of a satellite, a relay, a terrestrial destination and a terrestrial eavesdropper. Specifically, by employing a two-stage beamforming (BF) scheme, where the relay first adopts the maximal ratio combining (MRC) to receive the signal from satellite...
In this paper, we present an analytical study on the outage performance of a two-hop multiple-input and multiple-output (MIMO) amplify-and-forward (AF) relay network, where the source, relay and destination are all equipped with multi-antenna. Specifically, by applying the maximal-ratio-transmission (MRT) and maximal-ratio combining (MRC) for the transmitter and receiver of each hop, respectively,...
This paper studies the effects of antenna correlation and co-channel interference (CCI) on a dual-hop amplify-and-forward (AF) relay network over Rayleigh fading channels, where the source and destination are equipped with a single antenna, while the relay has multiple antennas. By assuming that beamforming (BF) based on the available statistical channel state information (SCSI) is applied, we first...
Large-scale network of the renewable energy imposes increasing stringent requirements, especially with regard to harmonic distortion limits imposed by the grid code and the switching losses of the high-power PWM converter itself. This paper presents a new control strategy adopting the receding horizon policy, i. e., model predictive control (MPC), for a diode clamped three-level topology converter...
This paper presents a passive dynamic walking model that can walk down stairs. Knee-bend mechanism which is inspired from the pattern of human's walking down stairs is designed in the walking model. The stance knee is designed to be bent between knee-strike and heel-strike. The bending time of the stance leg after knee-strike is adjusted to adapt to the stair height. By traversing the bending time...
A dual-linearly polarized microstrip antenna array working in the frequency of 2.4GHz is proposed according to the requirements of retrodirective antenna system. As the simulated results shown, both of the cross-polarization levels of the horizontal port and vertical port are lower than −20dB. Both of the horizontal-polarized and vertical-polarized main beams can scan from the angle −45º to +45º....
In this paper, a modified MUSIC algorithm, namely, VA-MUSIC is presented for the direction-of-arrival (DOA) estimation of noncircular signal sources. By using the conjugate counterpart of the array output, a virtual array is formed to extend the equivalent array aperture, so that it can handle more sources than sensors. Then, based on dividing the virtual array into many subarrays, and composing a...
The electrical characteristic of LPDA is analyzed first in this paper. Simulation software HFSS is used to get the optimization design of LPDA, and the simulation results are agree with the experimental dates appropriately. This simulation method uses much less time and cost than traditional method. Therefore, this paper approves a feasible implementation for antenna design and optimization.
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