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The idea for Prof. Norman Beaulieu's DL Tour was raised during the Globecom 2013 conference in December 2013 in Atlanta, when Prof. Beaulieu and Prof. Zoran Hadzi-Velkov, the Chair of the R. Macedonia ComSoc Chapter, first discussed it. The Distinguished Lecturer Tour was organized at the beginning of 2014 to include four different European countries: Republic of Macedonia, Italy, Montenegro, and...
Traditional wireless networks mainly focus on providing ubiquitous access and large capacity. One of the main challenges for future information and communication systems and technologies, including wireless networks, is reduction of the power consumption. Recent analysis by manufacturers and network operators have shown that current wireless networks are not very energy efficient, particularly the...
It has been shown that cooperative communication schemes can solve many of the issues faced by future broadband WWAN and WLAN networks. It is about communication concept based on resource sharing and coordination among terminals in wireless network that provides significant performance improvements in terms of increased coverage, data rates, capacity, reliability, spectral and energy efficiency. This...
In this paper, incorporation of MIMO concept is proposed as a solution for improving BER performance and energy efficiency of OFDM-CDMA downlink system with pilot tone and threshold detection combining (optimum TDC). The new presented system with MIMO included uses space-time block coding applied to two, three and four transmit antennas and it has an arbitrary number of receive antennas. BER (Bit...
We perform error probability analysis of the uncoded OFDM fixed gain amplify-and-forward (AF) relaying system with subcarrier permutation (SCP). Two SCP schemes, named: the best-to-best SCP (BTB SCP) and the best-to-worst SCP (BTW SCP) are considered. Closed-form expressions for the bit error rate (BER) of the above SCP methods are derived. Numerical results manifest that these SCP schemes may outperform...
This paper presents an analytical model for symbol error rate (SER) calculation of a polarization receive diversity system with equal gain combining (EGC) of the received signals. Ricean fading statistic characterizing wireless communication channel is assumed. Pade rational approximation to the moment generating function (MGF) of the output SNR (signal-to-noise ratio) is used in the case of EGC....
A frequency synchronization method for the specific OFDM receive diversity system, with implemented frequency domain subcarrier selection combining (SC), is proposed. It has been shown that the assumed diversity system is even more sensitive to frequency synchronization errors than standard OFDM system. Thus, a novel frequency synchronization method for the analyzed system is proposed. Using the simulation...
This paper analyzes SER (symbol error rate) performance of OFDM (orthogonal frequency division multiplexing) system with polarization diversity. It is assumed that the system consists of dual polarized transmit and receive antennas. Propagation environment is characterized with Ricean fading and an original method for analytical determination of the system SER performance is used. Input data streams...
In this paper, the impacts of different scheduling algorithms on buffered crossbar switch (BCS) performances are analyzed. Four BCSs are considered: combined input- and crosspoint-queued (CICQ) switch, output-queued with speed-up N (OQ-N) switch virtual ouput-queued with iterative longest input part first (VOQ) switch and virtual output-queued with longest input port first and with throughput maximization...
Sodium borohydride reduction of anti-3-methoxy-17β-hydroxyestra-1,3,5(10)-trien-6,7-dione 7-oxime (4a) afforded syn-3-methoxy-6α,17β-dihydroxyestra-1,3,5(10)-trien-7-one oxime (5), which in thionyl chloride at −18 °C undenvent Beckmann fragmentation reaction to the unexpected 3-methoxy-6-oxo-17β-hydroxy-6.7-secoestra-1.3.5(10)-trien-7-nitrile (6). A mechanism of this fragmentation process was proposed.
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