Now showing items 1-9 of 9

  • Chip Interleaving and its Optimization for PAPR Reduction in MC-CDMA 

    Fedra, Z.; Marsalek, R.; Sebesta, V. (Společnost pro radioelektronické inženýrství, 2007-12)
    This paper analyzes the usability of peak to average power ratio (PAPR) reduction in multicarrier code division multiple access (MC-CDMA) by the chip interleaving optimization. This means chip position formatting to PAPR ...
  • Estimating a Spectral Correlation Function under the Conditions of Imperfect Relation between Signal Frequencies and a Sampling Frequency 

    Sebesta, V. (Společnost pro radioelektronické inženýrství, 2010-04)
    This paper is devoted to the estimation of the spectral correlation function. The examined signal is a simple DSB-SC signal. The aim of the paper is discovering events connected with nonstandard relations between signal ...
  • High Frequency Components Recovery in Music Signals 

    Brejl, M.; Sebesta, V. (Společnost pro radioelektronické inženýrství, 1999-04)
    A new technique is presented which improves the subjective quality of band-limited music by recovery of high frequency components. Sequences of harmonics are found in the band-limited signal and these sequences are expanded ...
  • Investigation of predictability of Chaotic Signals 

    Sebesta, V. (Společnost pro radioelektronické inženýrství, 2000-04)
    Variables and functions for expressing quality of the prediction of the chaotic signal can serve as tools for simplified but useful description of the chaotic signal. In this paper, the known generation mechanism of chaos ...
  • OFDM Signal Detector Based on Cyclic Autocorrelation Function and its Properties 

    Sebesta, V.; Marsalek, R.; Fedra, Z. (Společnost pro radioelektronické inženýrství, 2011-12)
    This paper is devoted to research of the general and particular properties of the OFDM signal detector based on the cyclic autocorrelation function. The cyclic autocorrelation function is estimated using DFT. The parameters ...
  • Performance of Pilot Aided Channel Estimation Technique in 2D Spreading Based Systems 

    Blumenstein, J.; Fedra, Z.; Sebesta, V. (Společnost pro radioelektronické inženýrství, 2010-12)
    It has recently been observed that the combination of the OFDM (Orthogonal Frequency Division Multiplex) and the CDMA (Code Division Multiple Access) can achieve notably lower BER (Bit Error Rate) performance in comparison ...
  • Pseudo-Chaotic Sequences Generated Using Integer-Number Iterations 

    Sebesta, V.; Kolouch, J. (Společnost pro radioelektronické inženýrství, 2001-09)
    A proposed system generates a pseudo-chaotic sequence using integer-number look-up-table (LUT). The current output of LUT is used as LUT input address in the next step. The generated sequence approximates or simulates a ...
  • Spreading Sequences Generated Using Asymmetrical Integer-Number Maps 

    Sebesta, V. (Společnost pro radioelektronické inženýrství, 2007-09)
    Chaotic sequences produced by piecewise linear maps can be transformed to binary sequences. The binary sequences are optimal for the asynchronous DS/CDMA systems in case of certain shapes of the maps. This paper is devoted ...
  • The Testing of Pseudorandom Generators Using Correlation Properties 

    Sebesta, V.; Kilian, P. (Společnost pro radioelektronické inženýrství, 1992-5)
    The statistical properties of a pseudorandom sequence being characterized by the distribution of the values near to the uniform distribution may differ from the expected ones. On doing a quantitative evaluation of the ...