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In the modern LTE systems the Zadoff-Chu sequences are being used to transmit the synchronization signal. The complex sequence is transmitted both in the in-phase (I) and quadrature (Q) channels, the precision of which depends on the technological mismatch of the devices' parameters. The used sequences set a series of limitations on the existed communication systems. The development of new and prospective...
A constant-amplitude output signal for the Zadoff-Chu sequence was used for the low complexity MANET transmitter devices to improve safety of autonomous cars. The main goal is to merge the communication block and the obstacle detection block in singular multipurpose device. The article presents the algorithm of using the Zadoff-Chu sequence to establish the initial synchronization for the joint communication...
The paper describes possible scenarios and transceivers structures for providing synchronization in MANET-based distributed radar and communication systems. Two approaches were reviewed in terms of performance and synchronization requirements for omnidirectional antennas: beam forming technique and synthesized radar aperture. The calculations show that the synchronization requirements could be softened...
This article describes the outdoor mapping method of robot group using omnidirectional radio link communication. The issues of designing the radar system based on wearable radio communication devices with adding new functionality without changing the hardware are discussed. The method for providing the energetically concealed location of network objects detection is suggested. The calculations show...
This work proposes a stabilization and noise suppression method for the angle velocity sensor integrated readout circuit using additional adaptive feedback. This feedback circuit senses corner frequency of the input signal and adjusts readout bandwidth and output noise in accordance with this corner frequency. Model of sensor and readout circuit was developed in order to estimate dynamic and noise...
The article presents the results of the design of GaN phase shifter for MIMO-based antennas. The optimization and simulation for each operating frequency 0.1–31.5 GHz was performed along with simulation of effect of capacitance mismatch on phase shifter parameters. The phase shifter is designed as a switchable high-pass filter that provides a 90° phase shift with minimum insertion losses at the operating...
This article presents the design and analysis for a flexible antenna prototype. The polyimide-based flexible antenna was designed for the 5 GHz 802.11 standard. Worst-case scenario analysis with technological variables such as substrate thickness, loss tangent, relative dielectric constant, metal layer thickness, and configuration was used to prepare an adaptive process-independent technique for control...
The paper describes challenges and proposed guidelines for design of optimal layout solution of transistors and interconnections for GaN transistors in terms of providing best RF and SI parameters. For frequencies up to 60 GHz GaN transistors as a part of MMIC provide power density to the extent of 10 W/mm, but thorough choice of technologies and design of schematics, layout, interconnections, and...
The paper presents a two stage low noise amplifier for a MEMS gyro readout circuit. BiCMOS circuitry allows the LNA to achieve low noise level at the working frequency of 15 kHz without using chopper stabilization technique and large biasing currents in the first stage. First stage of the low noise amplifier is a three stage opamp with resistive feedback, first stage of which is a bipolar stage with...
This paper presents a method of calculating the minimal required transmission period for control messages and power margin for MANET with constrained resources, namely for communication and control systems on-planet robotic systems. For a system with ten robotic devices, with velocities of 10 cm/s, the sufficient power margin for worst case scenario will be equal to dP = 1 dB, which gives a transmission...
This paper presents an analog-controlled feedback for predistortion of switched mode GaN power amplifier with PAPR reduction technique. The nonlinearity control scenarios and algorithms are described. After the statistic simulation for different feedback delay the frequency dependent feedback loop was analyzed for implementing the model which enables to reduce PAPR for the basic types of power amplifier...
This article suggests a method for the return loss compensation for flexible antennas. MIMO-antenna with nine patches and its model were designed with operating frequency of 5.33 GHz. The antenna was measured and simulated in different states, and for compensating the return loss increase during bent state of antenna the all-capacitance matching network was suggested with variable values. Compensation...
A survey on various method of extracting small signal and large signal models parameters for GaN HEMT is presented. Small signal parameters are calculated from measured s-parameters, and a large signal model is derived by introducing additional nonlinear lumped elements to the small signal model. The transistor model is analyzed as the complex of the extrinsic and intrinsic model. Intrinsic parameters...
This article reviews basic considerations about layout configurations and materials for implementation of flexible antennas compatible with other flexible electronic components and systems. The measurement antenna layouts were chosen in order to obtain most significant degradation in performance characteristics which can be handled with using compensation methods during antenna's transceiver design.
In this article issues of implementation of testable integrated antenna are considered along with proposing a testing approach that allows taking into account the influence of packaging on measured characteristics of integrated antenna. A symmetric planar dipole was developed for 5–7 GHz frequency range with supplementary circuits and method of evaluation of effective area of antenna was proposed...
In this article issues of design, implementation, and characterization of integrated antennas are considered along with proposing methods for control of radiation pattern of such antennas using on-chip radiating elements which are as well aid in fulfilling the minimum metal density requirement. Results for suggested radiation pattern management method which can provide up to 42° maximum derivation...
This article describes development of device architecture for wireless high frequency transport networks which operate in millimeter wave range (71 – 76 GHz and 81 – 86 GHz). Features and issues of this range device design are considered along with applied methods. The example of routing in transport network with duplex frequency channel multiplexing is given. Analysis of influence of signal resolution...
Effectiveness of the sequential decoding process for each convolutional code depends on the correctly chosen configuration of a decoder. This article presents the results of research of the influence of the hypothetical probability of channel error parameter P characterizing the metric used in decoding on the behavior of the sequential Fano decoder for convolutional codes (171, 133, K = 7) and (5335336767373553,...
In this article particularities of implementing integrated antennas for RFID systems are discussed including the choice of antenna type along with basics for finding the optimal frequency considering the mutual coupling of reader's and tag's antennas. Testing approaches for measuring the integrated antenna's parameters and modulation-depth measurement method allow evaluating the influence of factors...
The issue of major interest during RFID systems development is reducing the size and price of RFID tag. This article is dedicated to design and implementation of 0.18 urn CMOS integrated antenna for RFID system to include price of antenna implementation in price of RFID IC. Decreasing techniques of influence of layout configuration and methods of decreasing of metal stress states inside chip on antenna...
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