The Experts below are selected from a list of 24096 Experts worldwide ranked by ideXlab platform

Salwa H El Ramly - One of the best experts on this subject based on the ideXlab platform.

  • The performance of a multistage quasi-Orthogonal minimum output energy multiuser detector for convolutionally coded CDMA systems in multipath environment
    Proceedings. 2004 IEEE Radio and Wireless Conference (IEEE Cat. No.04TH8746), 2004
    Co-Authors: M. M. A. -e. Aziz, Salwa H El Ramly
    Abstract:

    This work presents the performance of the multistage quasi-Orthogonal minimum output energy (QOMOE) multiuser detector (MuD) for a convolutionally coded synchronous CDMA system. The QOMOE detector minimizes the output variance with respect to the Component equivalent to the quasi-Orthogonal Component to the desired user's signature waveform, then the solution is the linear minimum mean square error (LMMSE) transformation. The multistage QOMOE receiver employs maximal-ratio combiner (QOMOE-MRC) for detection, and feeds a soft decision Viterbi decoder. A comparison is made among multistage detectors with first stage QOMOE-MRC, matched filter (MF-MRC), decorrelator-MRC, LMMSE-MRC and blind adaptive-MRC detector, in a frequency flat Rayleigh fading channel. Analysis and simulation results show that the multistage QOMOE-MRC can obtain better performance than other used detectors.

  • Performance analysis of a multistage quasi-Orthogonal minimum output energy multiuser detector for turbo coded CDMA systems in multipath environment
    IEEE 60th Vehicular Technology Conference 2004. VTC2004-Fall. 2004, 2004
    Co-Authors: M. M. A. -e. Aziz, Salwa H El Ramly
    Abstract:

    In this paper presents the performance of the multistage quasi-Orthogonal minimum output energy (QOMOE) detector for a turbo coded CDMA system. The QOMOE detector minimizes the output variance with respect to the Component equivalent to the quasi-Orthogonal Component to the desired user's signature waveform, then the solution is the linear minimum mean square error (LMMSE) transformation. The multistage QOMOE multiuser detector (MuD) employs maximal-ratio combiner (QOMOE-MRC) for detection of the desired user, and feeds a soft decision Viterbi decoder. A comparison is made among multistage detectors with first stage QOMOE-MRC, matched filter (MF-MRC), decorrelator-MRC, LMMSE-MRC and blind adaptive-MRC detector, in a frequency flat Rayleigh fading channel. Analysis and simulation results show that the multistage QOMOE-MRC has better performance than that of multistage LMMSE-MRC detector.

M. M. A. -e. Aziz - One of the best experts on this subject based on the ideXlab platform.

  • The performance of a multistage quasi-Orthogonal minimum output energy multiuser detector for convolutionally coded CDMA systems in multipath environment
    Proceedings. 2004 IEEE Radio and Wireless Conference (IEEE Cat. No.04TH8746), 2004
    Co-Authors: M. M. A. -e. Aziz, Salwa H El Ramly
    Abstract:

    This work presents the performance of the multistage quasi-Orthogonal minimum output energy (QOMOE) multiuser detector (MuD) for a convolutionally coded synchronous CDMA system. The QOMOE detector minimizes the output variance with respect to the Component equivalent to the quasi-Orthogonal Component to the desired user's signature waveform, then the solution is the linear minimum mean square error (LMMSE) transformation. The multistage QOMOE receiver employs maximal-ratio combiner (QOMOE-MRC) for detection, and feeds a soft decision Viterbi decoder. A comparison is made among multistage detectors with first stage QOMOE-MRC, matched filter (MF-MRC), decorrelator-MRC, LMMSE-MRC and blind adaptive-MRC detector, in a frequency flat Rayleigh fading channel. Analysis and simulation results show that the multistage QOMOE-MRC can obtain better performance than other used detectors.

  • Performance analysis of a multistage quasi-Orthogonal minimum output energy multiuser detector for turbo coded CDMA systems in multipath environment
    IEEE 60th Vehicular Technology Conference 2004. VTC2004-Fall. 2004, 2004
    Co-Authors: M. M. A. -e. Aziz, Salwa H El Ramly
    Abstract:

    In this paper presents the performance of the multistage quasi-Orthogonal minimum output energy (QOMOE) detector for a turbo coded CDMA system. The QOMOE detector minimizes the output variance with respect to the Component equivalent to the quasi-Orthogonal Component to the desired user's signature waveform, then the solution is the linear minimum mean square error (LMMSE) transformation. The multistage QOMOE multiuser detector (MuD) employs maximal-ratio combiner (QOMOE-MRC) for detection of the desired user, and feeds a soft decision Viterbi decoder. A comparison is made among multistage detectors with first stage QOMOE-MRC, matched filter (MF-MRC), decorrelator-MRC, LMMSE-MRC and blind adaptive-MRC detector, in a frequency flat Rayleigh fading channel. Analysis and simulation results show that the multistage QOMOE-MRC has better performance than that of multistage LMMSE-MRC detector.

Dushan Boroyevich - One of the best experts on this subject based on the ideXlab platform.

  • on zero steady state error voltage control of single phase pwm inverters with different load types
    IEEE Transactions on Power Electronics, 2011
    Co-Authors: Dong Dong, T. Thacker, Rolando Burgos, Fei Wang, Dushan Boroyevich
    Abstract:

    This paper comprehensively investigates and compares different multiloop linear control schemes for single-phase pulsewidth modulation inverters, both in stationary and synchronous (d -q) frames, by focusing on their steady-state error under different loading conditions. Specifically, it is shown how proportional plus resonant (P + R) control and load current feedback (LCF) control can, respectively, improve the steady-state and transient performance of the inverter, leading to the proposal of a PID + R + LCF control scheme. Furthermore, the LCF control and capacitive current feedback control schemes are shown to be subject to stability issues under second and higher order filter loads. Additionally, the equivalence between the stationary frame and d -q frame controllers is discussed depending on the Orthogonal term generation method, and a d-q frame voltage control strategy is proposed eliminating the need for the generation of this Orthogonal Component. This is achieved while retaining all the advantages of operating in the synchronous d-q frame, i.e., zero steady-state error and ease of implementation. All theoretical findings are validated experimentally using a 1.5 kW laboratory prototype.

Dong Dong - One of the best experts on this subject based on the ideXlab platform.

  • on zero steady state error voltage control of single phase pwm inverters with different load types
    IEEE Transactions on Power Electronics, 2011
    Co-Authors: Dong Dong, T. Thacker, Rolando Burgos, Fei Wang, Dushan Boroyevich
    Abstract:

    This paper comprehensively investigates and compares different multiloop linear control schemes for single-phase pulsewidth modulation inverters, both in stationary and synchronous (d -q) frames, by focusing on their steady-state error under different loading conditions. Specifically, it is shown how proportional plus resonant (P + R) control and load current feedback (LCF) control can, respectively, improve the steady-state and transient performance of the inverter, leading to the proposal of a PID + R + LCF control scheme. Furthermore, the LCF control and capacitive current feedback control schemes are shown to be subject to stability issues under second and higher order filter loads. Additionally, the equivalence between the stationary frame and d -q frame controllers is discussed depending on the Orthogonal term generation method, and a d-q frame voltage control strategy is proposed eliminating the need for the generation of this Orthogonal Component. This is achieved while retaining all the advantages of operating in the synchronous d-q frame, i.e., zero steady-state error and ease of implementation. All theoretical findings are validated experimentally using a 1.5 kW laboratory prototype.

Masoud Karimighartemani - One of the best experts on this subject based on the ideXlab platform.

  • fast and robust single phase dq current controller for smart inverter applications
    IEEE Transactions on Power Electronics, 2016
    Co-Authors: Mohammad Ebrahimi, Sayed Ali Khajehoddin, Masoud Karimighartemani
    Abstract:

    This paper presents a fast and robust $DQ$ current controller to regulate the output power of single-phase grid-connected inverters. The proposed method generates the grid current Orthogonal Component without introducing any additional dynamics or distortions to the control loop. Moreover, its operation does not depend on the system parameters. The proposed method exhibits improved steady-state and dynamic performances in comparison with the inverters equipped with the conventional Orthogonal signal generation techniques. Its improved characteristics make the proposed controller suitable for smart inverter applications, to provide advanced grid functionalities as demanded by recently revised standards. Simulation and experimental results show the feasibility and performance of this control structure.