Milan Zivkovic

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The optimization of wireless orthogonal frequency division multiplexing (OFDM) systems is based on the knowledge of the signal-to-noise ratio (SNR). Most of the existing methods for the SNR estimation operates in the frequency-domain and assumes perfect carrier frequency offset (CFO) synchronization. However, it has been shown that in real systems in the(More)
— This work is inspired by the question " Can 100 speakers talk for 30 minutes each in one room within one hour and with zero interference to each other's audience? " posed by Cadambe and Jafar at the 45th Allerton conference 2007, see [1]. We consider the problem of how many transmitter-receiver pairs can be placed such that each desired link may use half(More)
Optimal utilization of radio resources (bandwidth, transmit power) in multicarrier based systems becomes very challenging due to coexistence of various wireless standards within the same frequency band. Proposed demonstration, implemented in GNU Radio framework, enables capacity achieving OFDM-based data transmission between two network nodes with optimally(More)
—Orthogonal frequency division multiplexing (OFDM) offers high data rates and robust performance in frequency selective channels by link adaptation utilizing information about the channel quality. Combined with multiple-input multiple-output (MIMO) technique it provides improved link reliability and increased data rate. A crucial parameter required for(More)
INTRODUCTION The optimal revascularization strategy for unprotected left main coronary disease (ULMCD) is the subject of ongoing debate and patients with ULMCD still represent a challenge for interventionalist, especially in the setting of an acute coronary syndome (ACS). CASE REPORT We presented two cases of percutaneous treatment of ULMCD in the(More)
BACKGROUND/AIM Chronic heart failure (CHF) is highly prevalent and constitutes an important public health problem around the world. In spite of a large number of pharmacological agents that successfully decrease mortality in CHF, the effects on exercise tolerance and quality of life are modest. Renal dysfunction is extremely common in patients with CHF and(More)