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Build-in wiretap channel I with feedback and LDPC codes by soft decision decoding

IET COMMUNICATIONS 2017年第11期11卷 1808-1814页

作者： Zhang, Gaoyuan Wen, Hong Pu, Jiexin Tang, Jie Henan Univ Sci & Technol Sch Elect & Informat Engn Luoyang Peoples R China Univ Elect Sci & Technol China Natl Key Lab Sci & Technol Commun Chengdu Sichuan Peoples R China

Many approaches to build a wiretap channel (WTC) by multi-input multi-output system have been introduced. Different from those approaches, the authors propose a feedback method combined with the low-density parity-check (LDPC) codes for building the WTC I (WTC-I) to achieve unconditional security under single-input single-output system by the soft decision decoding. The novel approach establishes the WTC-I on both the binary symmetric channel and binary input additive white Gaussian noise channel. In order to keep the eavesdropper be fully ignorant about the secret information, randomness is added to the feedback signals from the destination by taking advantage of feedback. In addition, the message to be sent is encoded by the LDPC codes such that it can be correctly decoded by a legitimate receiver. Furthermore, the secret information transmission capacity can be improved by the soft decision decoding.

关键词： decoding parity check codes MIMO communication telecommunication security AWGN channels build-in wiretap channel I LDPC codes soft decision decoding multi-input multi-output system MIMO system low-density parity-check codes WTC I unconditional security single-input single-output system binary symmetric channel binary input additive white Gaussian noise channel feedback signals legitimate receiver secret information transmission capacity

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A generalized smith predictor for unstable time-delay SISO systems

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ISA TRANSACTIONS 2018年 72卷 197-204页

作者： Sanz, R. Garcia, P. Albertos, P. Univ Politecn Valencia Inst Automat & Informat Ind Valencia 46020 Spain

In this work, a generalization of the Smith Predictor (SP) is proposed to control linear time-invariant (LTI) time-delay single-input single-output (SISO) systems. Similarly to the SP, the combination of any stabilizing output-feedback controller for the delay-free system with the proposed predictor leads to a stabilizing controller for the delayed system. Furthermore, the tracking performance and the steady-state disturbance rejection capabilities of the equivalent delay-free loop are preserved. In order to place this contribution in context, some modifications of the SP are revisited and recast under the same structure. The features of the proposed scheme are illustrated through simulations, showing a comparison with respect to the corresponding delay-free loop, which is here considered to be the ideal scenario. In order to emphasize the feasibility of this approach, a successful experimental implementation in a laboratory platform is also reported. (C) 2017 ISA. Published by Elsevier Ltd. All rights reserved.

关键词： Smith Predictor Time delay External disturbances single-input single-output system

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Energy and spectral efficiency of secure massive MIMO downlink systems

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IET COMMUNICATIONS 2019年第10期13卷 1364-1372页

作者： Al-nahari, Azzam Sakran, Hefdhallah Su, Weifeng Tarbosh, Sami Ibb Univ Dept Elect Engn Ibb Yemen SUNY Buffalo Dept Elect Engn Buffalo NY USA

Spectral efficiency, energy efficiency, and security are cornerstones for the upcoming 5G systems. In this study, the issue of how the energy and spectral efficiency of multiuser massive multiple-input multiple-output (Ma-MIMO) systems are affected in the presence of a secrecy constraint is addressed. The performance of the two most prominent linear precoding techniques, the matched filter (MF) and zero-forcing (ZF) precoders, for secure downlink multiuser Ma-MIMO in the presence of multi-antenna passive eavesdropper is investigated. The authors consider three performance metrics, namely, the achievable ergodic secrecy rate, the secrecy spectral efficiency (SSE), and the secrecy energy efficiency (SEE), assuming perfect and imperfect channel state information. The tradeoff between SSE and SEE is also studied. Moreover, the authors derive tight lower bounds on the achievable ergodic secrecy rate for MF and ZF precoding techniques. The derived lower bounds provide insights on the tradeoff between the SSE and SEE. It is shown that ZF precoder outperforms MF precoder at high transmit power, whereas at very low transmit power, MF outperforms ZF. Moreover, it is shown that using large number of transmit antennas can improve the SSE and the SEE with orders of magnitude compared to a single-input single-output system.

关键词： precoding transmitting antennas antenna arrays telecommunication security MIMO communication matched filters telecommunication power management energy conservation 5G mobile communication linear codes multiantenna passive eavesdropper achievable ergodic secrecy rate secrecy spectral efficiency secrecy energy efficiency ZF precoding techniques MF precoder single-input single-output system secure massive MIMO downlink systems multiuser massive multiple-input multiple-output systems secrecy constraint 5G systems linear precoding techniques secure downlink multiuser Ma-MIMO systems matched filter zero-forcing precoders performance metrics imperfect channel state information perfect channel state information tight lower bounds

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Fractional-order control and interval analysis of SISO systems with time-delayed state

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IET CONTROL THEORY AND APPLICATIONS 2008年第1期2卷 16-23页

作者： Lanusse, P. Benlaoukli, H. Nelson-Gruel, D. Oustaloup, A. Univ Bordeaux CNRS IMS UMR 5218 F-33405 Talence France

The control of time-delayed perturbed systems is easy when time delay affects system inputs or outputs. In the more difficult case when system states are affected, CRONE (fractional order) control-system design (CSD) methodology can be adapted and used. Stability analysis is achieved using interval analysis. An academic time-delayed system is used to illustrate the robust CSD methodology and the robust stability analysis. In order to provide a reduced-order robust controller, a reduced-order Pade approximation of the nominal system is selected as the nominal plant.

关键词： time-delayed perturbed system control interval analysis Pade approximation technique CRONE control control system synthesis fractional-order control robust control robust stability analysis single-input single-output system SISO system delays control-system design perturbation techniques

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Blind sequence detection without channel estimation

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IEEE TRANSACTIONS ON SIGNAL PROCESSING 2002年第7期50卷 1735-1746页

作者： Li, XH SUNY Binghamton Dept Elect & Comp Engn Binghamton NY 13902 USA

This paper proposes a new blind sequence estimation method for single-input single-output (SISO) systems utilizing an optimal trellis search, which is performed by, a channel-independent Viterbi algorithm (CIVA). In contrast to the traditional Viterbi algorithm that requires accurate channel estimation, CIVA does not require channel coefficients. Instead, the metrics are calculated from a bank of test vectors designed off-line. The proposed algorithm has outstanding performance under most of the channel conditions. Specifically, it does not suffer from ill-conditioned channels. In addition, it does not depend on channel correlation estimation and, therefore, has fast convergence. Simulations demonstrate its superior performance over even most training-based equalization algorithms.

关键词： blind equalization blind sequence estimation channel identification single-input single-output system Viterbi algorithm

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Plant Model Analysis Based on Closed-Loop Step Response Data

Plant Model Analysis Based on Closed-Loop Step Response Data

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IEEE International Conference on Control Applications Part of 2010 IEEE Multi-Conference on systems and Control

作者： Matsui, Yoshihiro Kimura, Tomohiko Nakano, Kazushi Tokyo Natl Coll Technol Dept Elect Engn 1220-2 Kunugida Machi Hachioji Tokyo 1930997 Japan Univ Elect Commun Dept Engn Mech & Intelligent Syst Tokyo 1828585 Japan

ISBN: (纸本)9781424453634

In this paper, a simple scheme to estimate frequency responses of linear time-invariant single-input single-output (SISO) systems based on closed-loop step response data is investigated. The method uses only a single set of step response data of plants under closed-loop operating conditions. The input and output of a plant are filtered by a simple bandpass filter, and the frequency response of the plant is obtained with the Discrete Fourier Transforms (DFTs) of the filtered input and output signals. The validity of the proposed method is illustrated through simulations and experiments.

关键词： closed loop systems closed-loop operating condition closed-loop step response data control system analysis control system synthesis discrete Fourier transforms discrete Fourier transforms frequency response linear time-invariant system plant model analysis single-input single-output system step response

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Sensing for Spectrum Sharing in Cognitive LTE-A Cellular Networks

Sensing for Spectrum Sharing in Cognitive LTE-A Cellular Net...

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IEEE Wireless Communications and Networking Conference (WCNC)

作者： Karunakaran, Prasanth Wagner, Thomas Scherb, Ansgar Gerstacker, Wolfgang Univ Erlangen Nurnberg Inst Digital Commun Erlangen Germany Ericsson Nurnberg Germany

ISBN: (纸本)9781479930838

In this work we present a case fir dynamic spectrum sharing between different operators in systems with carrier aggregation (CA) which is an important feature in 3GPP LTE-A systems. Cross-carrier scheduling and sensing are identified as key enablers for such spectrum sharing in LTE-A. Sensing is classified as Type 1 sensing and Type 2 sensing and the role of each in the system operation is discussed. The more challenging Type 2 sensing which involves sensing the interfering signal in the presence of a desired signal is studied for a single-input single output system. Energy detection and the most powerful test are formulated. The probability of false alarm and of detection are analyzed for energy detectors. Performance evaluations show that reasonable sensing performance can be achieved with the use of channel state information, making such sensing practically viable.

关键词： Long Term Evolution cellular radio probability radio spectrum management signal detection wireless channels 3GPP LTE-A systems LTE-A cellular networks carrier aggregation channel state information cross-carrier scheduling identification cross-carrier sensing identification dynamic spectrum sharing false alarm probability interfering signal single-input single-output system type 1 sensing type 2 sensing Base stations Context Detectors Interference Noise OFDM Channel state information interfering signal Radio spectrum management false alarm probability Long Term Evolution BASE STATION wireless channels cellular radio signal acquisition single input single output systems Orthogonal frequency division multiplexing Noise

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Iterative Learning Reliable Control Strategy for a Class of SISO systems with Time-Delay and Actuator Faults 9

Iterative Learning Reliable Control Strategy for a Class of ...

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9th IEEE Data Driven Control and Learning systems Conference (DDCLS)

作者： Liu, Heng Wang, Yanjie Zhang, Ruikun Qingdao Univ Sci & Technol Sch Math & Phys Qingdao 266061 Peoples R China Qingdao Univ Sci & Technol Res Inst Math & Interdisciplinary Sci Qingdao Peoples R China

ISBN: (纸本)9781728159225

This manuscript presents an iterative learning control strategy for a class of single-input single-output (SISO) nonlinearly parameterized systems with unknown time-varying state delays and actuator faults. Based on some basic assumptions and the property of the state delays and actuator faults of the SISO nonlinear system, we design the P-type iterative learning reliable controller to deal with the nonlinearity caused by the time-delays term and actuator faults. And then, a composite energy function(CEF) is used to show the convergence property of the state tracking error. Finally, a numerical simulation is used to verify the correctness and effectiveness of control scheme.

关键词： Iterative Learning Control Time-varying state delays Actuator faults single-input single-output system

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Discrete input-output Second Order Sliding Mode Control Using LMIs Approach 12

Discrete Input-Output Second Order Sliding Mode Control Usin...

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International Multi-Conference on systems, Signals and Devices (SSD)

作者： Houda, Romdhane Khadija, Dehri Said, Nouri Ahmed Univ Gabes Sch Gabes Res Unit Numer Control Ind Proc Natl Engn St Medenine Gabes 6029 Tunisia

ISBN: (纸本)9781479917587

During the reachability phase, the sliding mode control is sensitive to external disturbances and uncertainties. In this paper, we propose to determine the coefficients of the sliding function using the technique of Linear Matrix Inequalities. This technique leads to an optimal choice of sliding function. Using the proposed sliding function, a discrete second order sliding mode control is presented. The control law is based on an input-output model. Simulation results demonstrate that the proposed strategy leads to an optimal performances in terms of the reduction of the reachability phase and the chattering phenomenon.

关键词： Discrete Second Order Sliding Mode Control single-input single-output system input-output Model Linear Matrix Inequalities Reachability phase

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Discrete input-output Second Order Sliding Mode Control Using LMIs Approach

Discrete Input-Output Second Order Sliding Mode Control Usin...

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International Multi-Conference on systems, Signals and Devices

作者： Romdhane Houda Dehri Khadija Nouri Ahmed Said Research Unit: Numerical Control of Industrial Processes National Engineering School of Gabes Street of Medenine 6029 Gabes University of Gabes Tunisia

ISBN: (纸本)9781479917594

关键词： Discrete Second Order Sliding Mode Control single-input single-output system input-output Model Linear Matrix Inequalities Reachability phase

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