Albert Mráz

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An exact and general performance analysis has been introduced for M-QAM modulation in terms of bit error ratio (BER) and transmission rate assuming gray mapping. BER expressions have been derived for different fading channel types (Rayleigh, Rice and Nakagami). The analyzed transmission considers OFDM interference, which is influenced by Rayleigh fading(More)
The performance of downlink multi-user MIMO OFDM transmission is investigated at the physical layer of 3GPP-LTE. Three different types of channel estimation imperfections are presented. Performance degradations caused by this imperfect channel estimation at the receiver are simulated and analyzed by means of uncoded bit error ratio as function of signal to(More)
Fair OFDMA (Orthogonal Frequency Division Multiple Access) based subcarrier allocation algorithm is proposed. The method includes adaptive modulation and power control per subcarrier, considering actual channel state information between users and base station. To heighten ‘fairness’, Preliminary Power Control (PPC) is executed before efficient allocation of(More)
This work aims the investigation of radio link performance of the 3GPP LTE in terms of the bit- and block error rate, assuming different error models for the feedback of the channel state information and the precoding matrix indicator. For the former, the imperfect knowledge of the radio channel is assumed within the receiver according to a Gaussian error(More)
The existing robust technique, Scalar Reconciliation combined with a Continuous-Variable Quantum Key Distribution is investigated in this paper with the help of simulations in terms of the symbol error rate. The solution contains efficient logical layer-based reconciliation for Continuous-Variable Quantum Key Distribution techniques, which extract the(More)
This work provides an exact analytical method for the calculation of the bit error rate for MIMO-ZF transmission, assuming arbitrary M level Quadrature Amplitude Modulation, to substitute the existing approximating solutions in the literature in the presence of Additive White Gaussian Noise. The authors have extended the calculations with a 3GPP LTE(More)
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