Now showing items 2-21 of 28

  • Cascade Structure of Digital Predistorter for Power Amplifier Linearization 

    Solovyeva, E. B. (Společnost pro radioelektronické inženýrství, 2015-12)
    In this paper, a cascade structure of nonlinear digital predistorter (DPD) synthesized by the direct learning adaptive algorithm is represented. DPD is used for linearization of power amplifier (PA) characteristic, namely ...
  • Comments on Pinched Hysteresis Loops of Memristive Elements 

    Biolek, Zdeněk; Biolek, Dalibor; Biolková, Viera; Kolka, Zdeněk (Společnost pro radioelektronické inženýrství, 2015-12)
    The hysteresis loops pinched in the v-i origin belong to well-known fingerprints of memristive elements driven by bipolar periodical signals. Some element properties follow from the loop behavior in the close neighborhood ...
  • Cross-Layer Combining of Adaptive Modulation and Truncated ARQ in Multichannel Beamforming MIMO Systems 

    Ivanis, P.; Drajic, D.; Brkic, S. (Společnost pro radioelektronické inženýrství, 2015-12)
    In this study the authors provide a cross-layer design of multiple-input-multiple-output (MIMO) systems, with the aim to maximize spectral efficiency. We consider MIMO systems based on a multichannel beamforming technique ...
  • Development of a Symmetric Ring Junction as a Four-Port Reflectometer for Complex Reflection Coefficient Measurements 

    Lee, K.Y.; Chung, B. K.; You, K. Y.; Cheng, E. M.; Abbas, Z. (Společnost pro radioelektronické inženýrství, 2015-12)
    Six-port reflectometer is well-known for its ability to measure magnitude and phase-shift of microwave signal using four power detectors that perform magnitude-only measurements. This paper presents the development of an ...
  • Efficient Resource Allocation and Sectorization for Fractional Frequency Reuse (FFR) in LTE Femtocell Systems 

    Kawser, M. T.; Islam, M. R.; Ahmed, K. I.; Karim, M. R.; Saif, J. B. (Společnost pro radioelektronické inženýrství, 2015-12)
    The Fractional Frequency Reuse (FFR) is a resource allocation technique that can effectively mitigate inter-cell interference (ICI) in LTE based HetNets and it is a promising solution. Various FFR schemes have been suggested ...
  • Efficient Simulation for Fixed-Receiver Bistatic SAR with Time and Frequency Synchronization Errors 

    Feifei Yan; Wenge Chang; Xiangyang Li (Společnost pro radioelektronické inženýrství, 2015-12)
    Time and frequency synchronization is the key technique of bistatic synthetic aperture radar (BiSAR) system, and raw data simulation is an effective tool for verifying the time and frequency synchronization techniques. ...
  • Electronically Tunable Current-mode High-order Ladder Low-pass Filters Based on CMOS Technology 

    Kunto, T.; Prommee, P.; Abuelma'atti, M. T. (Společnost pro radioelektronické inženýrství, 2015-12)
    This paper describes the design of current mode low-pass ladder filters based on CMOS technology. The filters are derived from passive RLC ladder filter prototypes using new CMOS lossy and lossless integrators. The all-pole ...
  • Energy Efficient Power Allocation for Distributed Antenna System over Shadowed Nakagami Fading Channel 

    Ying Wang; Xiangbin Yu; Yang Li; Binbin Wu (Společnost pro radioelektronické inženýrství, 2015-12)
    In this paper, the energy efficiency (EE) of downlink distributed antenna system (DAS) with multiple receive antennas is investigated over composite fading channel that takes the path loss, shadow fading and Nakagami-m ...
  • Envelope Factorization with Partial Elimination and Recombination, EF-PER, a New Linear RF Architecture 

    Diet, A.; Baudoin, G.; Lasaulce, S. (Společnost pro radioelektronické inženýrství, 2015-12)
    In this paper, a new architecture for efficient linear radio frequency transmitters is proposed; it includes envelope-tracking (ET) and envelope-elimination-and-restoration (EER) architectures as special instances. The ...
  • Generalized Analysis Method for a Class of Novel Wideband Loaded-Stub Phase Shifters 

    Sensong An; Badar Muneer; Qi Zhu (Společnost pro radioelektronické inženýrství, 2015-12)
    In this paper, an analysis method of wideband loaded-stub phase shifters and a fast designing procedure is presented. These kinds of phase shifters use a transmission line loaded with one or two open stubs and a reference ...
  • Generalized Propagation Channel Model for 2GHz Low Elevation Links Using a Ray-tracing Method 

    Zeleny, J.; Perez-Fontan, F.; Pechač, Pavel (Společnost pro radioelektronické inženýrství, 2015-12)
    Unmanned Aerial Vehicles (UAV) will increasingly be used for responding to emergencies or for law enforcement in civil surveillance applications. Transferring the enormous amounts of information from UAV-mounted cameras ...
  • High Voltage Coil Current Sensor for DC-DC Converters Employing DDCC 

    Drinovsky, M.; Hospodka, J. (Společnost pro radioelektronické inženýrství, 2015-12)
    Current sensor is an integral part of every switching converter. It is used for over-current protection, regulation and in case of multiphase converters for balancing. A new high voltage current sensor for coil-based current ...
  • Interference Suppression Performance of Automotive UWB Radars Using Pseudo Random Sequences 

    Pasya, I.; Kato, H.; Kobayashi, T. (Společnost pro radioelektronické inženýrství, 2015-12)
    Ultra wideband (UWB) automotive radars have attracted attention from the viewpoint of reducing traffic accidents. The performance of automotive radars may be degraded by interference from nearby radars using the same ...
  • Ku Band Rotary Joint Design for SNG Vehicles 

    Torpi,H.; Bostan, S. M. (Společnost pro radioelektronické inženýrství, 2015-12)
    A wideband I-type rectangular waveguide rotary joint (RJ) is designed, simulated and built. It has an excellent performance over the whole Ku Band (10.7-14.5 GHz) where the return loss is less than -23 dB at its highest ...
  • Large Core Three Branch Polymer Power Splitters 

    Prajzler, V.; Mastera, R.; Spirkova, J. (Společnost pro radioelektronické inženýrství, 2015-12)
    We report about three branch large core polymer power splitters optimized for connecting standard plastic optical fibers. A new point of the design is insertion of a rectangle-shaped spacing between the input and the central ...
  • Low-profile Circularly Polarized Antenna Exploiting Fabry-Perot Resonator Principle 

    Pítra, Kamil; Raida, Zbyněk; Lacik, J. (Společnost pro radioelektronické inženýrství, 2015-12)
    We designed a patch antenna surrounded by a mushroom-like electromagnetic band-gap (EBG) structure and completed it by a partially reflective surface (PRS). EBG suppresses surface waves and creates the bottom wall of the ...
  • A Microwave Metamaterial Inspired Sensor for Non-Invasive Blood Glucose Monitoring 

    Vrba, J.; Vrba, D. (Společnost pro radioelektronické inženýrství, 2015-12)
    In this paper, a microwave sensor based on an artificial transmission line is proposed for non-invasive blood glucose monitoring. A corresponding numerical model of the sensor implemented in microstrip technology is created ...
  • Multi-Core DSP Based Parallel Architecture for FMCW SAR Real-Time Imaging 

    Gu, C. F.; Chang, W. G.; Li, X. Y.; Liu, Z. H. (Společnost pro radioelektronické inženýrství, 2015-12)
    This paper presents an efficient parallel processing architecture using multi-core Digital Signal Processor (DSP) to improve the capability of real-time imaging for Frequency Modulated Continuous Wave Synthetic Aperture ...
  • A Novel Diversity Receiver Structure for Severe Fading and Frequency Offset Conditions 

    Dimitrijevic, B.; Krstic, V.; Nikolic, B. (Společnost pro radioelektronické inženýrství, 2015-12)
    This paper presents a novel diversity receiver of MPSK signal in fading channel in the presence of the carrier frequency offset. As a part of this receiver, a new algorithm for the estimation of the combining coefficients ...
  • Optimization of Far-Field Antenna Range 

    Cerny, O.; Dolecek, R.; Kopecky, P.; Schejbal, V.; Zavodny, V. (Společnost pro radioelektronické inženýrství, 2015-12)
    Measurements of test antennas are performed on antenna ranges. The operated microwave far-field outdoor range was built-up in 1970’s and therefore it was not appropriate for the today measurements. Thus, it was decided to ...