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IEEE 802.11ad SC-PHY Simulator with a Real-World 60GHz Indoor Channel Model

Authors:

Povalač, A.; Mikulášek, T.; Záplata, F.; Pospíšil, M.; Klíma, P.; Dokulil, K.

Type:

produkt

Date:

2019-12-02

Projects:

TH03010222 - Systém pro vzdálené řízení, správu a kontrolu ekonomiky provozu vozových parků s prioritou v odpadovém hospodářství
LO1401 - Interdisciplinární výzkum bezdrátových technologií (INWITE)

The system consists of several separate units that communicate wirelessly. It provides automation and central registration of fuel dispensing and vehicle movement, eliminating the human factor in fuel type mix up and attempted misuse when refueling. Individual vehicles are fitted with beacons that transmit their identification in the 2.4GHz band. Data collection is provided by the unit located in the body of the refueling gun. It searches for beacons in the vicinity and transmits the acquired data along with other data to the master system via communication in the 868MHz band. The collection unit is used to receive messages from individual refueling guns and forward them to the database backend

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Wideband 60 GHz transmitter with observation path

Authors:

Martin Pospíšil, Roman Maršálek, Tomáš Urbanec, Tomáš Götthans

Type:

functional demonstrator

Date:

2019-11-11

Projects:

LO1401 - Interdisciplinární výzkum bezdrátových technologií (INWITE)
GA17-18675S - Perspektivní komunikační technologie pro společnost v pohybu
FEKT-S-17-4426 ? Komunikační systémy budoucí generace

Prototype of a transmitter working in 57-64 GHz millimeter band able to transmit quadrature signals with maximal bandwidth of 1 GHz, equipped with an observation path receiver serving to monitor the quality of transmitted signal. The aim of the device is to provide a flexible measurement platform for research and development of signal processing methods and new highly spectrally efficient modulation formats. The observation path receivers allows for estimation and compensation of distortions induced by radio frequency front-end, namely amplitude and phase imbalance of a quadrature down/up convertor, by local oscillator leakage or by the nonlinearity of RF power amplifier. The transmitter is fully MATLAB-controlled and is connected with the control personal computer through an USB 3.0 bus. Development module with Texas Instruments high speed D/A convertor DAC37j84 (16 bits, up to 1.25 GSa./s.) serves as a platform for D/A conversion. For A/D conversion, the development module with high speed Texas Instruments A/D converter ADS54j40 (14 bits, up to 1 GSa./s.) is used. In order to achieve coherency between transmitter and the observation path receiver, both D/A and A/D converters share the same clock generated by an ultra low noise SAW 1 GHz oscillator. Both A/D and D/A converter cards are connected to FPGA development card TSW14j56 populated with FPGA Altera Arria V and DDR3 memory. The used DDE memory allows to send and receive signals in 16 bits resolution and maximal length of 2 GSa/s. Generated and received analogue baseband signal is processed in the custom baseband analog circuitry, that contains reconstruction and anti-aliasing filters, noise limiting filters, amplifiers and necessary impedance converters. Generated baseband signal is up/down converted to 60 GHz band through I/Q direct-conversion converter on Infineon BGT60 development board. The connection between BGT60 and custom baseband module is through a pair of SATA cables. RF signal in 60 GHz band is passed through a directional coupler with 30 dB attenuation in the feedback path and passband ripple lower than 1 dB in the working range of frequencies. The custom-built power supply is a part of the device. In order to achieve low signal distortions, the operation of the device is assisted by following signal processing algorithms implemented in MATLAB software:

  • Calibration of DC offset at Tx and Rx side
  • Calibration of amplitude and phase imbalances of the direct conversion up/down converter at Tx and Rx side
  • Compensation of frequency characteristics of analogue baseband circuitry at Tx and Rx side
  • Sin(x)/x compensation of D/A converters
  • Compensation of power amplifier nonlinearity of in-built BGT60 power amplifier
More detailed information on implemented methods as well as on the use of the device for research can be found e.g. in these publications: R. Marsalek, M. Pospisil, T. Gotthans and T. Urbanec, "Digital Calibration of 60 GHz Setup for Use in Power Amplifier Predistortion," 2019 IEEE 20th International Workshop on Signal Processing Advances in Wireless Communications (SPAWC), Cannes, France, 2019, pp. 1-4. R. Marsalek, J. Blumenstein, M. Pospisil and M. Rupp, "Measured Capacity of mm-Wave Radio Link Under IQ Imbalance," 2018 IEEE 29th Annual International Symposium on Personal, Indoor and Mobile Radio Communications (PIMRC), Bologna, 2018, pp. 1124-1125.

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Monitor of Equivalent Dose Quantity of Neutrons

Authors:

Herman, O., Jančář, A., Král, J., Kubíček, M., Matěj, Z., Mravec, F., Pavelek, M.

Type:

functional demonstrator

Date:

2019-08-29

Projects:

FV20453 - Digitální spektrometr směsných polí fotonů a neutronů
FEKT-S-17-4426 - Komunikační systémy budoucí generace
LO1401 - Interdisciplinární výzkum bezdrátových technologií (INWITE)

The designed monitor of equivalent dose quantity of neutrons (Fig. 1) allows detection of gama particles and neutrons. It also provides information about type of the particles and their energies. The monitor fulfill the requirements on the fast response and mechanical endurance. The realization of the monitor has required designing a specialized digitising unit which ensures reliable conversion of the signal measured by the ionisation detector. As a part of the monitor, there are implemented algorithms for classification of the gamma radiation and the neutron particles. This classification is quite complicated for the employed type of the detector and the successful classification is only allowed by sophisticated algorithms for the signal processing. The implemented algorithm fulfils requirements on the high reliability of the classification, but also on the fast processing of the input signals (the detection in the real time) while it demands reasonable amount of the computational resources. Due to quite long response of the detector on the detected particles, a superposition of responses occurs for a high recurrence of the particles. These superpositions are detected and decomposed which allows classification of time-close interactions.

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Laboratory Spectrometer of Low-energy Neutrons

Authors:

Jančář, A., Král, J., Kubíček, M., Matěj, Z., Mravec, F., Povalač, A., Urbanec, T.

Type:

functional demonstrator

Date:

2019-08-29

Projects:

FV20453 - Digitální spektrometr směsných polí fotonů a neutronů
FEKT-S-17-4426 - Komunikační systémy budoucí generace
LO1401 - Interdisciplinární výzkum bezdrátových technologií (INWITE)

The laboratory spectrometer of low-energy neutrons (fig. 1) enables real-time characterization of mixed fields of gamma and neutron radiation in the range from about 20 keV to about 1 MeV. Compared to other solutions this instruments is simple to operate and is able to automatically discriminate gamma / neutron radiation. Thanks to the gas proportional detector used and thanks to the fast signal processing chain (preamplifier, digitizer) it is possible to perform real-time measurement of mixed fields of ionizing radiation. By selecting proper gas proportional detector it is possible to adjust sensitivity of the spectrometer to the desired field of particular experiment.

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2x2 Circularly Polarized Mictrostrip Patch Antenna Array

Authors:

Jaroslav LÁČÍK

Type:

functional demonstrator

Date:

2019-05-17

Projects:

Projekt č. SR18957044 s firmou Honeywell International s.r.o
LO1401 - Interdisciplinární výzkum bezdrátových technologií (INWITE)

The 2x2 circularly polarized microstrip patch antenna array for the frequency band from 1525 to 1559 MHz was designed and fabricated according to the requirements. The antenna radiates a right handed circularly polarized wave. In the frequency band of interest, the antenna has the VSWR lower than 1.5, the axial ratio lower than 3 dB, and the gain about 11.6 dBi. The antenna is equipped by a SMA connector. The antenna will be used for receiving of low level signals. The fabricated antenna is depicted in Fig. 1.

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Vývojová platforma pro komunikační rozhraní v napěťovém a proudovém módu

Authors:

Vykydal, L.

Type:

functional demonstrator

Date:

2019-02-26

Projects:

FEKT-S-17-4707 - Návrhy nových funkčních bloků a algoritmů pro moderní komunikační systémy
LO1401 - Interdisciplinární výzkum bezdrátových technologií (INWITE)

The platform has been developed as add-on boards for Enclustra FPGA board with Xilinx Zynq. This enables an easy connection of the development setup with PC using variety of interfaces, namely USB 3.0, GLAN, and UART in case of lower data-rate requirements. The setup is prepared for testing a master-slave bus with one master and up to 6 slave nodes. The platform supports both voltage- and current-mode communication. The piggyback board contains ADC and DAC for converting physical layer signal into the digital domain. The rest of communication interface, including symbol recognition, synchronization, scrambling, and error detection is implemented purely in the digital domain. A PC software implements communication trough UART to bus master implemented in FPGA and application level communication. The software can also be used to visualize data from slaves and in the same time to evaluate the frame error rate based on CRC embedded in communication frames.

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Testbed pro metody tlumení měničů s využitím v ultrazvukových parkovacích systémech

Authors:

Ledvina, J.; Vykydal, L.

Type:

functional demonstrator

Date:

2019-02-13

Projects:

FEKT-S-17-4707 - Návrhy nových funkčních bloků a algoritmů pro moderní komunikační systémy
LO1401 - Interdisciplinární výzkum bezdrátových technologií (INWITE)

The designed testbed is used to test feasibility of advanced algorithms for automatic tuning of parallel resonant circuit of an ultrasonic transducer to maximize system performance, mainly in short distance measurements. The system consists of PCB with an analog test-chip and PCB with an FPGA for digital control. The test-chip is equipped with ultrasonic drivers and receivers, synthetic inductance and additional circuitry for different types of damping. The test-chip is highly configurable for the maximum flexibility of presented system. The PCB with FPGA is populated with Xilinx Spartan-6 FPGA and offers high variety of communication interfaces mainly USB, CAN, and LIN. The developed FPGA configuration allows control of the system from PC software and also integration in a test vehicle.

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