Poslední příspěvky

  • A New Quasi-Optimum Power Control Scheme for Downlink in W-CDMA Macro Cellular System 

    Taha Ahmed, B.; Calvo Ramon, M.; de Haro Ariet, L. (Společnost pro radioelektronické inženýrství, 2003-06)
    The downlink power control problem in W-CDMA is studied using a new proposed model. The downlink cell capacity is given for the old model given by Gejji and our new model. A capacity increase of 16 % for the special case ...
  • Throughput Analysis of an Adaptation Rule in the HARQ Environment 

    Goga, S.; Polec, J.; Kotuliakova, K. (Společnost pro radioelektronické inženýrství, 2003-06)
    In this paper we analyze the adaptation rule, which estimates the channel state and switches between hybrid ARQ (automatic-repeat-request) and pure ARQ. Convolutional code was chosen as FEC (forward-error-correction) in ...
  • Microwave-Circuit Optimization with Parallel Enhanced Fast Messy Genetic Algorithm (pefmGA) 

    Kostka, P.; Skvor, Z. (Společnost pro radioelektronické inženýrství, 2003-06)
    Fast messy genetic optimization is found suitable for complex microwave circuit design. Increase in computation speed is achieved using several ordinary computers connected to a network. Calculations are running on background ...
  • FDSS Downlink Capacity in Urban Zone Near Digital Video Broadcasting Installations 

    Taha Ahmed, B.; Calvo Ramon, M.; de Haro Ariet, L. (Společnost pro radioelektronické inženýrství, 2003-06)
    The FDSS macrocell downlink capacity is evaluated for macrocells that operate at the same frequency of the Digital TV station (DTV) and that are nearby the DTV installations. It has been founded that the cell capacity is ...
  • FDTD Stability: Critical Time Increment 

    Pauk, L.; Skvor, Z. (Společnost pro radioelektronické inženýrství, 2003-06)
    A new approach suitable for determination of the maximal stable time increment for the Finite-Difference Time-Domain (FDTD) algorithm in common curvilinear coordinates, for general mesh shapes and certain types of boundaries ...
  • Analysis and Simulation of Frost's Beamformer 

    Strupl, M.; Sovka, Pavel (Společnost pro radioelektronické inženýrství, 2003-06)
    Sensor arrays are often used for a signal separation from noises using the information about the direction of arrival. The aim of this paper is to analyze Frost's beamformer with respect to the speech preprocessing for the ...
  • A Family of Coherence-Based Multi-Microphone Speech Enhancement Systems 

    Pham, Q. H.; Sovka, Pavel (Společnost pro radioelektronické inženýrství, 2003-06)
    This contribution addresses the problem of additive noise reduction in speech picked up by a microphone in a noisy environment. Two systems belonging to the family of coherence-based noise cancellers are presented. Suggested ...