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Systems Engineering and Electronics, Journal of

Issue 1 • Date March 2005

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Displaying Results 1 - 25 of 45
  • [Front cover]

    Publication Year: 2005 , Page(s): c1
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    Freely Available from IEEE
  • Editorial committee

    Publication Year: 2005 , Page(s): 1
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  • Contents

    Publication Year: 2005 , Page(s): 1 - 2
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    Freely Available from IEEE
  • Optimal design of basic pulse waveforms for THSS UWB radio systems

    Publication Year: 2005 , Page(s): 1 - 10
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (1302 KB)  

    Ultrawide bandwidth (UWB) radio, a very promising technique carrying information in very short basic pulses, has properties that make it a viable candidate for short-range wireless communications. In this paper, several short-pulse waveforms based on Gaussian genetic monocycle as well as Gaussian pulse waveform, as candidates of basic UWB pulse waveforms, are firstly proposed and investigated. Their spectrum characteristics, bit transmission rate(BTR), and bit error rate (BER) performance in AWGN channel using time hopping spread spectrum (THSS) and pulse position modulation (PPM) are simulated and evaluated. The numerical results are compared and show that the basic pulse waveforms determine the spectrum characteristics of UWB signals and have much effect on the performance of UWB radio system. The performance of UWB radio system achieved by the proposed basic pulse waveforms is much better than that of UWB radio system realized by other used basic pulse waveforms under the uniform conditions. Also, the polarity of these short basic pulses does not affect the performance of UWB radio system. View full abstract»

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  • Analysis and application of wavelet transform in target imaging and detection of stepped frequency MMW radar

    Publication Year: 2005 , Page(s): 11 - 20
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (1380 KB)  

    The and target detection methods for stepped frequency signal based on the wavelet transform, but also its respective power spectrum are proposed. The multisampling property of stepped frequency signal is studied and wavelet transform is well suited for analyzing the signal. After multisampling property of stepped frequency signal being studied, it is shown that the wavelet power spectrum analyses is transform is used to target detection. To determine a suitable wavelet scaling for imaging of range profile's MMW radar, the distance resolution ΔR technique is proposed. The effectiveness of this new method is evaluated using simulated noisy radar signal. Results show that the proposed method out the exactness and low computational complexity of this method. View full abstract»

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  • Two-step measurement update for extended Kalman filtering

    Publication Year: 2005 , Page(s): 21 - 25
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (688 KB)  

    The nonlinear filtering for a class of discrete-time stochastic dynamic systems whose measurement equations contain linear (or universal linearizable) components and nonlinear components which are mutually statistical independentis investigated. A two-step measurement update is proposed for the filtering of the systems. The first-step update is a linear (or universal linearization) measurement correction which introduces an intermediate estimate, while the second-step nonlinear linearization update produces the final posterior estimate based on the first-step estimate. Since the first measurement correction is a linear or universal linearization update, it provides an accurate linearization reference point for the second nonlinear measurement update. Two simulation examples show superiority of the new estimation method View full abstract»

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  • Irregular and regular LDPC codes with high spectrum efficiency modulation in image transmission over fading channel

    Publication Year: 2005 , Page(s): 26 - 30
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (800 KB)  

    If the degree distribution is chosen carefully, the irregular low-density parity-check (LDPC) codes can outperform the regular ones. An image transmission system is proposed by combining regular and irregular LDPC codes with 16QAM/64QAM modulation to improve both efficiency and reliability. Simulaton results show that LDPC codes are good coding schemes over fading channel in image communication with lower system complexity. More over, irregular codes can obtain a code gain of about 0.7 dB compared with regular ones when BER is 10−4. So the irregular LDPC codes are more suitable for image transmission than the regular codes. View full abstract»

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  • Providing QoS guarantees for self-similar traffic flows

    Publication Year: 2005 , Page(s): 31 - 36
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (1027 KB)  

    Provisioning network resource to meet the quality of Service (QoS) demand is^a key issue for future network services. Such functions may be realized by an admission control algorithm, which determined whether or not a new traffic flow can be admitted into the network. It is widely accepted that many traffic flows have self-similar character that has detrimental influence on network performance. This characteristic has made old mathematical models invalid, and a new model must work with self-similar fractal instead. This paper applies Fractional Brownian Motion(FBM) model and integrates it into the comprehensive admission control scheme, which takes account of aggregated traffic behavior to get the statistical multiplexing performance gain. Experiment verifies that FBM model can be used to realistically describe packet traffic in modem packet networks and accurately predict their performance. View full abstract»

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  • DOCCII-based electronically tunable current-mode biquadratic filters

    Publication Year: 2005 , Page(s): 37 - 41
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (673 KB)  

    A complete state variable current-mode biquadratic filter built by duo-output CO I (DOCCII) with variable current gain is presented. All the coefficients of the filter can be independently tuned through the variable current gain factors of the DOCCII. Based on the principles upon which the general biquadratic filter was-constructed, a universal electronically tunable current-mode filter is proposed which implements the low-pass, high-pass, band-pass, band-suppress and all-pass second order transfer functions simultaneously. The PSPICE simulations of frequency responses of second-order filter of are also given. View full abstract»

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  • Novel space-time multiuser detection algorithm of WCDMA system

    Publication Year: 2005 , Page(s): 42 - 46
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (816 KB)  

    The structure and performance of space-time multiuser detection receiver at base stationsof WCDMA system is analyzed, in which smart antenna is employed. WCDMA uplink signal model is established in this paper. Space-time multiuser receiver presented in this paper combines 2D-RAKE with parallel interference cancellation(PIC), and the improved parallel interference cancellation methods are given. A novel space-time multiuser detection scheme, 2DRAKE-GPPIC is proposed. This scheme employs smart antenna to suppress unexpected DOA (Direction Of Arrival) signal, uses RAKE receiver to combine different delays of expected signal, and utilizes grouped partial parallel interference cancellation (GPPIC) algorithm to suppress further the interference signal in the main lobe of array antennas. The simulation results reveal that the scheme of space-time multiuser detection presented in this paper has better performance for WCDMA system. View full abstract»

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  • Fast synchronization scheme for SMCC + system with lower SNR

    Publication Year: 2005 , Page(s): 47 - 51
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (805 KB)  

    Synchronization with lower SNR hadn't been considered by the conventional publications. Based on the Synchronized multi-carrier CDMA plus (SMCC+) system, which is one of the candidate schemes of digital terrestrial TV broadcasting (DTTB) standard in China, a scheme under lower SNR with one short training sequence and one Barker code group, which were constructed in time domain. Computer simulation results show that the timing estimator here is designed to avoid the ambiguity which occured in Tufvesson's timing synchronization method. The 99.9; correct timing synchronization probability and lower false probability are got in AWGN and Rayleigh fading channels with SNR under −20 dB, and the optimum properties of frequency synchronization are obtained at the same time. It is shown that the proposed scheme is much better than the conventional synchronization methods. View full abstract»

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  • Model update mechanism for mean-shift tracking

    Publication Year: 2005 , Page(s): 52 - 57
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (1198 KB)  

    In order to solve the model update problem in mean-shift based tracker, a novel mechanism is proposed Kalman filter is employed to update object model by filtering object kernel-histogram using previous model and current candidate. A self-tuning method is used for adaptively adjust all the parameters of the filters under the analysis of the filtering residuals. In addition, hypothesis testing servers as the criterion for determining whether to accept filtering result. Therefore, the tracker has the ability to handle occlusion so as to avoid over-update. The experimental results show that our method can not only keep up with the object appearance and scale changes but also be robust to occlusion Key wwtte: mean-shift, tracking, model update, Kalman filter, hypothesis testing. View full abstract»

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  • Handover initiation performance of a new multi-cell cellular configuration with a developed base-station multi-beam antenna

    Publication Year: 2005 , Page(s): 58 - 62
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (675 KB)  

    A new multi-cell cellular configuration networks is provided for analysis of handover initiation probability, which is based on multi-beam base-station antenna splitting in the elevation-radiating plane. The sum of the received signal power in the mobile station, including both desired and interference signal power, has been introduced into the handover initiation algorithm. Along with the idea, we present three models of handover initiation algorithm with the shadowing process of Gaussian distribution. The formulation of handover initiation probability of those algorithms is also analyzed. The validity of the presented models has been checked through the comparison with simulation results. The results present the performance characteristics of handover initiation vary with cluster number and base-station antenna elevation angle View full abstract»

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  • Study of component-ware & application software framework based decision support system development

    Publication Year: 2005 , Page(s): 63 - 68
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (947 KB)  

    The view that the traditional method of DSS development is outdated, which results to the diversiform disadvantages of DSS product. Therefore the ideas of application software framework based development to the generation process of DSS is introduced and a modified flow chat of DSS development is proposed. Moreover, a formal description of the DSS software framework and its development is given. The analysis results indicates that not only does the new development flow ensure the DSS development global stability but also improves the software reusability level of the development process. View full abstract»

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  • Decision making with fuzzy probability assessments and fuzzy payoff

    Publication Year: 2005 , Page(s): 69 - 73
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (737 KB)  

    A novel method for decision making with fuzzy probability assessments and fuzzy payoff is presented. The consistency of the fuzzy probability assessment is considered. A fuzzy aggregate algorithm is used to indicate the fuzzy expected payoff of alternatives. The level sets of each fuzzy expected payoff are then obtained by solving linear programming models. Based on a defuzzification function associated with the level sets of fuzzy number and a numerical integration formula (Newton-Cotes formula), an effective approach to rank the fuzzy expected payoff of alternatives is also developed to determine the best alternative. Finally, a numerical example is provided to illustrate the proposed method. View full abstract»

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  • Non standard pallet series designing problem in ammunition supply system

    Publication Year: 2005 , Page(s): 74 - 77
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (658 KB)  

    According to the compound packing problem in ammunition supply system in our army, the non-standard pallet series design model is proposed, and the original problem that can be solved as a set cover problem with a nested bin-packing problem, is analyzed, then two heuristic algorithms are applied to solve the problem View full abstract»

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  • Use of piecewise polynomial phase modeling to compensate ionospheric phase contamination in skywave radar systems

    Publication Year: 2005 , Page(s): 78 - 83
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (920 KB)  

    Recognition and correction of ionospheric phase path contamination is a vital part of the global radar signal processing sequence. A number of model-based correction algorithms have been developed to deal with the radar performance degradation due to the ionospheric distortion and contamination. This paper addresses a novel parametric estimation and compensation method based on High-order Ambiguity Function (HAF) to solve the problem of phase path contamination of HF skywave radar signals. When signal-to-noise ratio and data sequence available satisfy the predefined conditions, the ionospheric phase path contamination may be modeled by a polynomial phase signal (PPS). As a new parametric tool for analyzing the PPS, HAF is introduced to estimate parameters of the polynomial-phase model and reconstruct the correction signal. Using the reconstructed correction signal, compensation can be performed before coherent integration so that the original echo spectrum can be restored. A piecewise scheme is proposed to track rapid variation of the phase contamination based on HAF method, and it can remove the Dbppler spread effect caused by the ionosphere nonstationarity. Simulation and experimental results are given to demonstrate the efficiency of the proposed algorithm View full abstract»

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  • Near time optimal control with perturbation estimation for flexible spacecraft slewing maneuvers

    Publication Year: 2005 , Page(s): 84 - 91
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (1028 KB)  

    A feedforward approach for generating near time optimal controller for flexible spacecraft rest-to-rest maneuvers is presented with the objective insensitivity to modeling errors, parameter uncertainty and minimizing the residual energy of the flexible modes. The perturbation estimation of flexible appendages to the rigid-hub is accomplished simply via compare the output of real plant with the reference model, and the approach is based on combine this estimation with the bang-bang control for the rigid-hub modes through analysis the basic constraint and the additional constraint, i. e. zero coupling torque and zero coupling torque derivative for general two orders system and three orders system with considerate attitude acceleration mode near time optimal controls. These time optimal controls with control constraints and state constraints leads to forming a boundary — value problem, and resolved the problem using an iterative numerical algorithm. The near time optimal control with perturbation estimation shows a good robust to parameter uncertainty and can suppress the vibration and minimizing the residual energy. The capability of this approach is demonstrated through a numerical example in detail View full abstract»

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  • Hierarchical satisfying optimal algorithm with different importance and priorities

    Publication Year: 2005 , Page(s): 92 - 97
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (890 KB)  

    A hierarchical satisfying optimal algorithm incorporating different importance and preemptive priorities is formulated. With the priority structure given by the decision-maker in the constrained multi-objective multi-degree-offreedom optimization (CMMO) problem, the commonly used quadratic programming model is converted into a two-level optimization problem solved by the tolerant lexicographic method and the varying-domain optimization method. In contrast to previous works, the proposed approach allows the decision-maker to determine a desirable achievement degree for each goal to reflect explicitly the relative importance of these goals. The resulting solutions satisfy both the preemptive priority structure and have the maximum achievement degrees in sum. The power of the proposed approach is demonstrated with an example. View full abstract»

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  • Robust H control for fuzzy descriptor systems with state delay

    Publication Year: 2005 , Page(s): 98 - 101
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (527 KB)  

    The problem of robust H fuzzy state feedback control for uncertain fuzzy descriptor systems with state delay is solved. In the case that time-varying uncertainties are in all parameter matrices, sufficient conditions for the existence of fuzzy state feedback controller are presented in terms of linear matrix inequality (LMI). The proposed robust H control laws guarantee that the resulting closed-loop system is regular, impulse free, and stable with prescribed H norm bounded constraint for all admissible uncertainties. Finally, a numerical example is provided to demonstrate the validity of the proposed method. View full abstract»

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  • Robust L1 filtering with pole constraint in a disk via parameter-dependent Lyapunov functions

    Publication Year: 2005 , Page(s): 102 - 109
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (986 KB)  

    The problem of robust L1 filtering with pole constraint in a disk for linear continuous polytopic uncertain systems is discussed. The attention is focused on design a linear asymptotically stable filter such that the filtering error system remains robustly stable, and has a L, performance constraint and pole constraint in a disk. The new robust Lx performance criteria and regional pole placement condition are obtained via parameter-dependent Lyapunov functions method. Upon the proposed multiofcjective performance criteria and by means of LMI technique, both full-order and reducedotder robust L1 filter with suitable dynamic behavior can be obtained from the solution of convex optimization problems. Compared with earlier result in the quadratic framework, this approach turns out to be less conservative. The efficiency of the proposed technique is demonstrated by a numerical example. View full abstract»

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  • Fuzzy robust attitude controller design for hydrofoil catamaran

    Publication Year: 2005 , Page(s): 110 - 115
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (845 KB)  

    A robust attitude controller for hydrofoil catamaran throughout its operating envelope is proposed, based on Tagaki-Sugeno (T-S) fuzzy model. Firstly, T-S fuzzy model and robust attitude control strategy for hydrofoil catamaran is presented by use of linear matrix inequality (LMI) techniques. Secondly, a nonlinear mathematical model of hydrofoil catamaran is established, acting as the platform for further researches. The specialty in interpolation of T-S fuzzy model guarantees that feedback gain can be obtained smoothly, while boat's speed is shifting over the operating envelope. The external disturbances are also attenuated to achieve H control performance, meanwhile. Finally, based on such a boat, HC200B-A1, simulation researches demonstrate the design procedures and the effectiveness of fuzzy robust attitude controller. View full abstract»

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  • Digital implementation of fractional order PID controller and its application

    Publication Year: 2005 , Page(s): 116 - 122
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (941 KB)  

    A new discretization scheme is proposed for the design of a fractional order PID controller. In the design of a fractional order controller the interest is mainly focused on the s-domain, but there exists a difficult problem in the s-domain that needs to be solved, i.e. how to calculate fractional derivatives and integrals efficiently and quickly. Our scheme adopts the time domain that is well suited for Z-transform analysis and digital implementation. The main idea of the scheme is based on the definition of Grunwald-Letnicov fractional calculus. In this case some limited terms of the definition are taken so that it is much easier and faster to calculate fractional derivatives and integrals in the time domain or zdomain without loss much of the precision. Its effectiveness is illustrated by discretization of half-order fractional differential and integral operators compared with that of the analytical scheme. An example of designing fractional order digital controllers is included for illustration, in which different fractional order PED controllers are designed for the control of a nonlinear dynamic system containing one of the four different kinds of nonlinear blocks: saturation, deadzone, hysteresis, and relay. View full abstract»

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  • Design and implementation of 2DOF spherical inverted pendulum

    Publication Year: 2005 , Page(s): 123 - 127
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (807 KB)  

    The dynamics of 2DOF spherical inverted pendulum system is analyzed. The motion of the pendulum may be projected onto the orthogonal planes in the Cartesian Space. In this way the system can be decoupled into two classical cart-pendulum systems and the design of controllers aimed at each subsystem separately are proposed. The linear quadratic optimal control strategy is applied in order to balance the pendulum system at the ‘inverted’ status. The method proposed is verified by the simulation and actual system experiments and the performance of the controller is discussed. View full abstract»

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  • Novel l2-l controller design for LPV discrete time-delay systems

    Publication Year: 2005 , Page(s): 128 - 133
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (796 KB)  

    One of the first attempts to derive energy-to-peak performance criteria and state-feedback controller design problem for linear parameter-varying discrete time systems with time delay is provided. Firstly, we present a parameterdependent l2-l performance criterion using a parameter-dependent Lyapunov function. Upon the conditions addressed, an improved parameter-dependent l2-l performance criterion is established by the introduction of a slack variable, which exhibits a kind of decoupling between Lyapunov functions and system matrices. This kind of decoupling enables us to obtain more easily tractable conditions for analysis and synthesis problems. Then, the corresponding parameter-dependent state-feedback controller design is investigated upon these performance criteria, with sufficient conditions obtained for the existence of admissible controllers in terms of parameterized linear matrix inequalities. Finally, a numerical example is provided to illustrate the feasibility and advantage of the proposed controller design procedure. View full abstract»

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Aims & Scope

Journal of Systems Engineering and Electronics reports the latest developments and achievements in both theoretical and practical aspects of systems engineering, electronics and related research areas.

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Editor-in-Chief
Professor Rong Shi
Journal of Systems Engineering and Electronics