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U ovom radu analiziran je uticaj nelinearnosti relejne stanice sa fiksnim pojačanjem na performanse kooperativnog „pojačaj i proslijedi" sistema sa selektivnim kombinovanjem na odredišnom terminálu. Direktni link je izložen Rajsovom fedingu, a kooperativni link kombinovanom Rejlijevom/Rajsovom fedingu. Nelinearan pojačavač na relejnom čvoru je modelovan idealnim limiterom. Izvedeni su analitički...
In this paper a reconfigurable input matching network (IMN) for power amplifiers (PA) is designed and simulated. An IMN is realized as T-section, where reconfigurability is achieved by switch element (PIN diode switch). When PIN diode switch is ON the PA operates at 3.45 GHz. In PIN diode switch OFF state the PA operates at 3.75 GHz. The S-parameters and power added efficiency (PAE), of about 45%...
This paper presents compensation of all undesired effects (Power Amplifier (PA) nonlinearity, transmitter and receiver antenna crosstalk, before-PA nonlinear crosstalk, Multiple Input Multiple Output (MIMO) channel fading and crosstalk) in MIMO Orthogonal Frequency Division Multiplex (OFDM) wireless systems. It has been demonstrated that reduced-complexity Crossover Digital Predistortion (CO-DPD)...
In this paper, an evaluation of unwanted effects in Multiple Input Multiple Output (MIMO) transmitters is described. Complete 2×2 and 4×4 MIMO Orthogonal Frequency Division Multiplex (OFDM) transmitters are simulated for the purpose of quantifying all potential unwanted effects such as Power Amplifiers' (PAs) nonlinearity, linear and nonlinear crosstalk, and IQ modulator imperfections. An experimental...
In this paper, an evaluation of unwanted effects in Multiple Input Multiple Output (MIMO) transmitters is described. Complete 2×2 and 4×4 MIMO Orthogonal Frequency Division Multiplex (OFDM) transmitters are simulated for the purpose of quantifying all potential unwanted effects such as Power Amplifiers' (PAs) nonlinearity, linear and nonlinear crosstalk, and IQ modulator imperfections. An experimental...
This paper presents analysis of nonlinear distortion and crosstalk compensation in Multiple Input Multiple Output (MIMO) OFDM wireless transmitters. This paper demonstrates that nonlinear crosstalk affects the performance of digital predistorter and it cannot be compensated by the conventional Memory Polynomial digital predistortion technique. Also, it has been shown that proposed CO-DPD technique...
Paper describes empirical analysis of UMTS multipath propagation at 2127.6 MHz in an active Belgrade 3G network for the case of stationary UMTS ROMES TSMQ (Rohde&Schwarz) measurement receiver. Reader will be introduced to characteristics of LOS and NLOS measurement scenarios, so as with measurement results which include: basic parameters for time dispersion of UMTS propagation channel and their...
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