Change search
Refine search result
1 - 7 of 7
CiteExportLink to result list
Permanent link
Cite
Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf
Rows per page
  • 5
  • 10
  • 20
  • 50
  • 100
  • 250
Sort
  • Standard (Relevance)
  • Author A-Ö
  • Author Ö-A
  • Title A-Ö
  • Title Ö-A
  • Publication type A-Ö
  • Publication type Ö-A
  • Issued (Oldest first)
  • Issued (Newest first)
  • Created (Oldest first)
  • Created (Newest first)
  • Last updated (Oldest first)
  • Last updated (Newest first)
  • Disputation date (earliest first)
  • Disputation date (latest first)
  • Standard (Relevance)
  • Author A-Ö
  • Author Ö-A
  • Title A-Ö
  • Title Ö-A
  • Publication type A-Ö
  • Publication type Ö-A
  • Issued (Oldest first)
  • Issued (Newest first)
  • Created (Oldest first)
  • Created (Newest first)
  • Last updated (Oldest first)
  • Last updated (Newest first)
  • Disputation date (earliest first)
  • Disputation date (latest first)
Select
The maximal number of hits you can export is 250. When you want to export more records please use the Create feeds function.
  • 1. Hult, Tommy
    et al.
    Mohammed, Abbas
    Suppression of EM Fields using Active Control Algorithms2004In: Radioengineering, ISSN 1210-2512, E-ISSN 1805-9600, Vol. 13, no 3, p. 22-25Article in journal (Refereed)
    Abstract [en]

    Active methods for attenuating acoustic pressure fields have been successfully used in many applications. In this paper we investigate some of these active control methods in combination with a MIMO antenna system in order to assess their validity and performance when applied to electromagnetic fields. The application that we evaluated in this paper is a model of a mobile phone equipped with one ordinary transmitting antenna and two actuator-antennas which purpose is to reduce the electromagnetic field at a specific area in space (e.g. at the human head). Simulation results show the promise of using the adaptive active control algorithms and MIMO system to attenuate the electromagnetic field power density.

  • 2. Landqvist, Ronnie
    et al.
    Mohammed, Abbas
    An Adaptive Block-Based Eigenvector Equalization for Time-Varying Multipath Fading Channels2005In: Radioengineering, ISSN 1210-2512, E-ISSN 1805-9600, Vol. 14, no 1, p. 20-23Article in journal (Refereed)
    Abstract [en]

    In this paper we present an adaptive block-based eigenvector algorithm (BBEVA) for blind equalization of time-varying multipath fading channels. In addition we assess the performance of the new algorithm for different configurations and compare the results with the least mean squares (LMS) algorithm. The new algorithm is evaluated in terms of intersymbol interference (ISI) suppression, mean squared error (MSE) and by examining the signal constellation at the output of the equalizer. Simulation results show that the BBEVA performs better than the non-blind LMS algorithm.

  • 3. Landqvist, Ronnie
    et al.
    Mohammed, Abbas
    An Efficient and Effective Pilot Space-Time Adaptive Algorithm for Mobile Communication Systems2005In: Radioengineering, ISSN 1210-2512, E-ISSN 1805-9600, Vol. 14, no 1, p. 29-31Article in journal (Refereed)
    Abstract [en]

    In this paper we present a new adaptive space-time algorithm for mitigating the effects of CCI and ISI and minimising the probability of error in mobile communication systems, and evaluate its performance for different mobile velocities. The proposed algorithm is computationally efficient and provides better performance than the conventional RLS algorithm.

  • 4. Landqvist, Ronnie
    et al.
    Mohammed, Abbas
    Comparative Performance of Three Algorithms for Principal Component Analysis2006In: Radioengineering, ISSN 1210-2512, E-ISSN 1805-9600, Vol. 15, no 4, p. 84-90Article in journal (Refereed)
  • 5. Landqvist, Ronnie
    et al.
    Mohammed, Abbas
    Simulation of Wireless Digital Communication Systems2004In: Radioengineering, ISSN 1210-2512, E-ISSN 1805-9600, Vol. 13, no 4, p. 1-7Article in journal (Refereed)
    Abstract [en]

    Due to the explosive demands for high speed wireless services, such as wireless Internet, email and cellular video conferencing, digital wireless communications has become one of the most exciting research topics in electrical and electronic engineering field. The never-ending demand for such personal and multimedia services, however, demands technologies operating at higher data rates and broader bandwidths. In addition, the complexity of wireless communication and signal processing systems has grown considerably during the past decade. Therefore, powerful computer­aided techniques are required for the process of modeling, designing, analyzing and evaluating the performance of digital wireless communication systems. In this paper we discuss the basic propagation mechanisms affecting the performance of wireless communication systems, and present a simple, powerful and efficient way to simulate digital wireless communication systems using Matlab. The simulated results are compared with the theoretical analysis to validate the simulator. The simulator is useful in evaluating the performance of wireless multimedia services and the associated signal processing structures and algorithms for current and next generation wireless mobile communication systems.

  • 6. Mohammed, Abbas
    et al.
    Ballal, Tarig
    Grbic, Nedelko
    Blind Source Separation Using Time-Frequency Masking2007In: Radioengineering, ISSN 1210-2512, E-ISSN 1805-9600, Vol. 16, no 4, p. 96-100Article in journal (Refereed)
  • 7. Mohammed, Abbas
    et al.
    Hult, Tommy
    The Effects of MIMO Antenna System Parameters and Carrier Frequency on Active Control Suppression of EM Fields2007In: Radioengineering, ISSN 1210-2512, E-ISSN 1805-9600, Vol. 16, no 1, p. 31-35Article in journal (Refereed)
    Abstract [en]

    In this paper we propose a new approach employing adaptive active control algorithms combined with a Multiple-Input Multiple-Output (MIMO) antenna system to suppress the electromagnetic field at a certain volume in space (e.g., at the human head). We will investigate the effects of the size and number of MIMO antenna elements on the system performance and test the algorithms at different carrier frequencies (e.g., GSM bands and UMTS).

1 - 7 of 7
CiteExportLink to result list
Permanent link
Cite
Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf