Due to its high efficiency and reduced emissions, new zero-emission hybrid electric vehicles have been selected as an attractive challenge for future transport applications. New zero -emission hybrid electric, on the ...
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Due to its high efficiency and reduced emissions, new zero-emission hybrid electric vehicles have been selected as an attractive challenge for future transport applications. New zero -emission hybrid electric, on the other hand, has some major drawbacks from the complicated charging process. The hybrid electrical fuel cell system is introduced as the main source to intelligently control multi-source activities. An ultra-capacitor system is selected as the energy recovery assistance to monitor the fuel cell's fast transient and peak power during critical periods. To regulate energy demand and supply, an intelligent energy management system is proposed and tested through several constraints. The proposed approach system aims to act quickly against sudden circumstances related to hydrogen depletion in the prediction of the required fuel consumption basis. The proposed strategy tends to define the proper operating system according to energy demand and supply. The obtained results show that the designed system meets the targets set for the energy management unit by referring to an experimental velocity database.
Admission control has been widely utilized to alleviate network congestion. However, most current studies choose the admissible users based on instantaneous channel information. Due to the time-varying characteristics...
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ISBN:
(纸本)9789082797015
Admission control has been widely utilized to alleviate network congestion. However, most current studies choose the admissible users based on instantaneous channel information. Due to the time-varying characteristics of wireless channels, the admissible user set changes quickly, which complicates network management and renders heavy operational costs. This motivates us to take the stability of the admissible user set into account in admission control, thus leading to a long-term admission control problem. In this paper, we consider a joint long-term admission control and beamforming problem in a downlink network consisting of one multi-antenna base station (BS) and multiple single-antenna users. To maintain a relatively stable admissible user set and minimize the power cost for the admissible users to achieve their quality-of-service levels, we jointly optimize the admissible users, the BS transmit beamformers, and the switching frequency of each user's admissible status in a given time period. To handle this challenging non-convex problem, we first design a sequential convex approximation (SCA) algorithm to iteratively compute a stationary solution. To facilitate algorithm's implementation, we further employ the alternating direction method of multipliers to come up with an efficient, semi-closed-form update of each SCA problem.
Classical time reversal (TR) pre-filtering has been considered as one of the key physical layer security techniques for wireless communication applications in the last decade. This paper proposes a secrecy capacity ac...
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Classical time reversal (TR) pre-filtering has been considered as one of the key physical layer security techniques for wireless communication applications in the last decade. This paper proposes a secrecy capacity achievable time reversal pre-filter to further enhance the confidentiality of a multi-input single-output (MISO) wireless communication system. In addition, an unequal secrecy protection (UESP) MISO broadcast configuration is constructed in frequency selective channels by exploiting classical and secrecy capacity achievable TR pre-filters, so that UESP wireless communication services can be offered. Theoretical proofs and simulation results show that the proposed TR pre-filter achieves the secrecy capacity in frequency selective channels (HIPERLAN/2 BranA), and the MISO broadcast configuration can provide mobile users with three levels of UESP hierarchical services in terms of public, private and confidential messages.
A novel current mode MOSFET-only structure with multi-input single-output (MISO) is proposed. The proposed circuit is free from passive circuit elements like resistors and capacitors and able to realize low-pass (LP),...
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A novel current mode MOSFET-only structure with multi-input single-output (MISO) is proposed. The proposed circuit is free from passive circuit elements like resistors and capacitors and able to realize low-pass (LP), band-pass (BP), high-pass (HP), band-stop (BS) and all-pass (AP) filter functions with using the same circuit configuration. It is also important to note that the proposed filter has electronic tunability property. The proposed circuit is laid-out in the Cadence environment using 0.18 mu m TSMC CMOS technology parameters. The layout area is only 408 mu m(2) and the power consumption is about 0.6 mW. Furthermore, to investigate the performance of the BP filter output of the proposed MISO filter, Monte Carlo and corner analyses are also presented. It is shown that the mismatches and the process variations cause only small deviations for the BP filter configuration. Furthermore, the noise performance of the proposed filter is also investigated. (C) 2017 Elsevier GmbH. All rights reserved.
Modern greenhouse creates suitable crop growth conditions through changing inside temperature, humidity, solar radiation, concentration of carbon dioxide and other environmental factors to raise production and increas...
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ISBN:
(纸本)9781538629185
Modern greenhouse creates suitable crop growth conditions through changing inside temperature, humidity, solar radiation, concentration of carbon dioxide and other environmental factors to raise production and increase economic *** greenhouse microclimate environment model can not only simulate the behavior of a system well but also design the inside controller suitably to be applied to the greenhouse production. The temperature system in a greenhouse microclimate environment can be regarded as a multi-input single-output hybrid system. In this paper, the system was described by Auto Regressive Moving Average model with e Xternal inputs(ARMAX). The test data were analyzed for the correlation of input variables and output variable. Then, by means of fading memory recursive least squares, the parameters of the model were identified. Finally, the model was simulated and tested. The actual values were fitted by simulation values and the fitting degree reached 0.91 which showed the model was effective.
This paper presents two new space time block codes (STBCs) with quasi orthogonal structure for an open loop multi-input single-output (MISO) systems. These two codes have been designed to transmit from three or four a...
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ISBN:
(纸本)9781509025268
This paper presents two new space time block codes (STBCs) with quasi orthogonal structure for an open loop multi-input single-output (MISO) systems. These two codes have been designed to transmit from three or four antennas at the transmitter and be given to one antenna at the receiver. In this paper first, the proposed codes are introduced and their structures are investigated. This is followed by the demonstration of how the decoder decodes half of transmitted symbols independent of the other half. The last part of this paper discusses the simulation results, makes performance comparison against other popular approaches and concludes that the proposed solutions offer superiority.
In this paper analysis results of a cooperation of the Unified Power Quality Conditioner (UPQC) with the photovoltaic system are presented. The proposed system consists of a series inverter, a shunt inverter, and some...
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ISBN:
(纸本)9781424438105
In this paper analysis results of a cooperation of the Unified Power Quality Conditioner (UPQC) with the photovoltaic system are presented. The proposed system consists of a series inverter, a shunt inverter, and some photovoltaic arrays connected in the dc link through the multi-input single-output (MISO) DC-DC converter. A numerical formulation of the proposed control schemes, which are based on the instantaneous power theory, is presented. The proposed system can improve the power quality at the Point of Common Coupling (PCC) on power distribution systems. The performance of the proposed system was analyzed using simulations with Power System Computer Aided Design/ElectroMagnetic Transients DC (PSCAD/EMTDC) analysis program.
Transmitter designs based on partial channel state information (CSI) have become increasingly attractive in multi-antenna wireless communication systems. To capture partial CSI statistics at the transmitter, we rely o...
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Transmitter designs based on partial channel state information (CSI) have become increasingly attractive in multi-antenna wireless communication systems. To capture partial CSI statistics at the transmitter, we rely on a channel amplitude information (CAI) model, based on which we aim for maximizing the random channel's average mutual information. Due to the high computational complexity required for such optimal transmissions, we resort to reduced complexity practical schemes and derive necessary and sufficient conditions for these alternatives to achieve maximal average mutual information.
For a class of single-output processes with at least two control inputs, this note proposes a simple control design and study its stability. To this end, the process is factorized into a stable and non-minimum-phase f...
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For a class of single-output processes with at least two control inputs, this note proposes a simple control design and study its stability. To this end, the process is factorized into a stable and non-minimum-phase factor and a possible unstable minimum-phase factor. By the addition of a (low-pass) filter of suitable dimension, one can obtain a process factorization where the minimum-phase factor has a proper and stable inverse. Once the plant has been factorized in this form, the proposed control synthesis method is composed of two main steps;namely, output regulation based on the non-minimum-phase factor and design of an optimization-based divider to compute the value corresponding to the multiple inputs. In this way, one obtains the control transfer function of each control input in a parallel control architecture. An analysis of the control structure is provided, giving sufficient conditions for the stability of the control loop. (C) 2004 Published by Elsevier Ltd.
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