RF Transceiver Research Articles

간섭 신호에 강인한 특성을 갖는 데이터 통신과 위치 인식 시스템을 위한 3~5 GHz 대역의 IR-UWB RF 송수신기

간섭 신호에 강인한 특성을 갖는 데이터 통신과 위치 인식 시스템을 위한 3~5 GHz 대역의 IR-UWB RF 송수신기

SSCS DL Borivoje Nikolic Visits Student Branch Chapter in Novi Sad, IEEE Serbia Montenegro Section: Talks on Flexible RF Transceiver Design [Chapters

SSCS DL Borivoje Nikolic Visits Student Branch Chapter in Novi Sad, IEEE Serbia Montenegro Section: Talks on Flexible RF Transceiver Design [Chapters

Yield Recovery of RF Transceiver Systems Using Iterative Tuning-Driven Power Conscious Performance Optimization

This paper proposes a fast and low-cost method of calibrating RF transceiver systems using on-chip DSP resources and some additional circuit control points. Experimental results on a commercial power amplifier demonstrate significant increases in production yields using the proposed approach.

FPGA based Smart Wireless MIMO Control System

In our present work, we have successfully designed, and developed an FPGA based smart wireless MIMO (Multiple Input & Multiple Output) system capable of controlling multiple industrial process parameters such as temperature, pressure, stress and vibration etc. To achieve this task we have used Xilin x Spartan 3E FPGA (Field Programmable Gate Array) instead of conventional microcontrollers. By employing FPGA kit to PC via RF transceivers which has a working range of about 100 meters. The developed smart system is capable of performing the control task assigned to it successfully. We have also provided a provision to our proposed system that can be accessed for monitoring and control through the web and GSM as well. Our proposed system can be equally applied to all the hazardous and rugged industrial environments where a conventional system cannot work effectively.

Special issue on THz communications

In wireless communication networks a rapid increase of traffic demand has been observed in conjunction with the development of applications that require rapidly increasing data rates even on a single link. Within the next decade applications will be developed demanding for data rates of several 10 s of Gbit/s. These data rates can be only achieved by either significantly improving spectral efficiencies or by extending the available spectrum to several 10 s of GHz. Such an amount of spectrum is available only beyond 300 GHz, which is called the Terahertz frequency range. In order to develop a system operating beyond 300 GHz at data rates with several 10 s of Gbit/s is a challenging task requiring an interdisciplinary approach incorporating areas like, propagation and channel modeling, antennas, RF transceiver design, appropriate baseband technologies, MAC protocols, etc. A couple of years ago activities in research, standardization and regulation have emerged. Applications of THz communications range from single stand alone and dedicated super high capacity data pipes up to a “THz nano cell„ as a part of integrated cellular multi-layer system.

Programmable RF Built-In Self-Test Circuit for 5GHz Wireless LAN

This paper proposes a new programmable RF Built-In Self-Test (BIST) circuit for 5GHz Wireless LAN. It is fabricated using 0.18-µm SiGe technology. This circuit is useful for testability of GHz-band RF IC devices in a complete RF transceiver environment. The proposed circuit helps it to provide DC output voltages and accurate phase difference. It contains two peak detectors and a phase detector. The proposed circuit showed excellent performance.

Energy Efficient Coded Communication for IEEE 802.15.4 Compliant Wireless Sensor Networks

The multipath nature of the wireless environment does not provide reliable links for robust communication in wireless senor networks (WSNs). These unreliable links increase the error level to a greater extent and therefore, reduces battery life. Hence, there arises a need for developing energy efficient forward error correction code that avoids more energy consuming Automatic Repeat request (ARQ) scheme used in WSNs to improve link reliability. In this paper, we consider a simple block error correction codes such as cyclic and Bose Chaudhuri Hocquenghem (BCH) codes to be used in IEEE 802.15.4 RF transceiver based sensor nodes. The simulations are performed to measure network parameters such as bit error rate, and energy spent per bit under Rayleigh fading channel environment. It is found that BCH code with code rate of 0.8 provides coding gain of 1.6 dB when compared with cyclic and ARQ schemes and proves to be an energy efficient code among the codes considered.

Planar quadrature RF transceiver design using common-mode differential-mode (CMDM) transmission line method for 7T MR imaging.

The use of quadrature RF magnetic fields has been demonstrated to be an efficient method to reduce transmit power and to increase the signal-to-noise (SNR) in magnetic resonance (MR) imaging. The goal of this project was to develop a new method using the common-mode and differential-mode (CMDM) technique for compact, planar, distributed-element quadrature transmit/receive resonators for MR signal excitation and detection and to investigate its performance for MR imaging, particularly, at ultrahigh magnetic fields. A prototype resonator based on CMDM method implemented by using microstrip transmission line was designed and fabricated for 7T imaging. Both the common mode (CM) and the differential mode (DM) of the resonator were tuned and matched at 298MHz independently. Numerical electromagnetic simulation was performed to verify the orthogonal B1 field direction of the two modes of the CMDM resonator. Both workbench tests and MR imaging experiments were carried out to evaluate the performance. The intrinsic decoupling between the two modes of the CMDM resonator was demonstrated by the bench test, showing a better than -36 dB transmission coefficient between the two modes at resonance frequency. The MR images acquired by using each mode and the images combined in quadrature showed that the CM and DM of the proposed resonator provided similar B1 coverage and achieved SNR improvement in the entire region of interest. The simulation and experimental results demonstrate that the proposed CMDM method with distributed-element transmission line technique is a feasible and efficient technique for planar quadrature RF coil design at ultrahigh fields, providing intrinsic decoupling between two quadrature channels and high frequency capability. Due to its simple and compact geometry and easy implementation of decoupling methods, the CMDM quadrature resonator can possibly be a good candidate for design blocks in multichannel RF coil arrays.

Energy Conservation in IEEE 802. 15. 4 Compliant Wireless Sensor Network using LT codes

In this paper, we investigate the energy efficiency of a IEEE 802. 15. 4 based RF transceiver using Direct Sequence Spread SpectrumOffset Quadrature Phase Shift Keying (DSSSOQPSK) modulation under 2.4 GHz frequency band in a WSN. Multi path propagation in a wireless environment affects the reliability of the network and therefore the sensor nodes wastes the battery power to ensure successful delivery of data by adopting Automatic Repeat reQuest (ARQ) schemes. Error control coding is one of the most suitable solutions to this reliability issue. In this paper, the use of one such Forward Error Correction (FEC) codes such as Luby Transform (LT) codes to reduce energy expenditure by the network nodes is analyzed under Rayleigh fading channel environment. The performance metrics considered for our study are Bit Error Rate (BER) and Energy spent per bit. Simulation results show that LT codes show improved performance under severe fading channel conditions, i. e., for low SNR values (-5 to 2 dB) and ARQ scheme provides better performance under high SNR values (above 2 dB).

A LOW POWER 2.4 GHz RF TRANSCEIVER FOR ZIGBEE APPLICATIONS

This paper presents a low power RF transceiver for 2.4 GHz ZigBee applications. The current reused inductor-less-load balun low noise amplifier (LNA) with quadrature mixer is proposed for area and power saving for low-IF receiver. The transmitter adopts power efficient power amplifier (PA) to improve transmitting efficiency. This RF transceiver is implemented in 0.18 μm CMOS technology. The receiver achieves 6.5 dB noise figure (NF) and 20 dB conversion gain. The transmitter delivers maximum +3 dBm output power with PA efficiency of 30%. The receiver and transmitter front-end dissipate 1.9 mW and 5.3 mW at 1.8 V supply, respectively. The whole die area is 0.95 mm2.

Integrated 200–240-GHz FMCW Radar Transceiver Module

We present a 220-GHz homodyne transceiver module intended for frequency modulated continuous wave radar applications. The RF transceiver circuits are fabricated on 3-μm-thick GaAs membranes, and consist of a Schottky diode based transmitter frequency doubler that simultaneously operates as a sub-harmonic down-converting mixer. Two circuits are used in a balanced configuration to improve the noise performance. The output power is > 3 dBm over a 40-GHz bandwidth (BW) centered at 220 GHz, and the receiver function is characterized by a typical mixer conversion loss of 16 dB. We present radar images at 4-m target distance with up to 60-dB dynamic range using a 30-μs chirp time, and near-BW-limited range resolution. The module is intended for applications in high-resolution real-time 3-D radar imaging, and the unit is therefore designed so that it can be assembled into 1-D or 2-D arrays.

Design of Tungsten Tailing Reservoir Safety Monitoring and Warning System Based on Wireless Sensor Networks and LabVIEW

In view of the existing flaws of traditional manual observations, a new type of tailing reservoir safety monitoring and warning system based on ZigBee and LabVIEW was designed. The system chose SoC chip CC2530 as the RF transceiver and designed the low-power wireless sensor networks nodes to collect and process the data of tailing reservoir. It chose ZigBee 2007 as the network communication protocol, and uploaded the data to PC by RS232 serial port. The monitoring and warning interface of PC was completed with LabVIEW. The testing results show that the data transmission of the network is stable and the system is suitable for real-time monitoring and warning of the tungsten tailing reservoir.

A 60 GHz transceiver for low power ad hoc networks

ABSTRACTThis article presents a low‐power consumption architecture of RF transceiver using impulse radio signals operating at 60 GHz. Both intrinsic features and related technologies of this operating frequency are detailed and the specific topology of this communication and geolocalization system is introduced. The performance of this low‐power consumption system is validated experimentally. The emitter exhibits an energy efficiency down to 10 pJ/bit and data rates up to 10 Mbps. Geolocalization ability of this 60 GHz system is also experimentally demonstrated with localization accuracy in the range of 40 cm. © 2013 Wiley Periodicals, Inc. Microwave Opt Technol Lett 55:2640–2643, 2013

An IEEE 802.15.4g sun compliant MR-OFDM RF CMOS transceiver for smart grid and CES

This paper proposes an IEEE 802.15.4g SUN OFDM-based 920 MHz RF CMOS transceiver. It can be adopted in energy saving intelligent green homes, which are related to Smart Grid, as well as universal remote controller, building automation, which is related to CEs (Consumer Electronics), and other areas. With the proposed SUN OFDM-based RF transceiver, wireless connectivity among CE devices or among electric metering systems can considerably save electronic energy and make our lives more comfortable. The proposed RF transceiver consists of a RF front-end with an on-chip RF switch, a Tx BBA (Baseband Analog), a Rx BBA, and a PLL. The proposed RF transceiver is implemented in 0.18-μm CMOS technology and consumes 37 mA in Tx mode and 38 mA in Rx mode from a 1.8 V supply voltage. With the fabricated RF transceiver chip, two successful public demonstrations have been carried out, which show the possibility of its use in commercial products.

Public Key Techniques for Prevention of Resource Exhaustion Attack in Wireless Sensor Networks

This paper proposes a prevention mechanism for resource exhaustion attack in Wireless Sensor Networks (WSN). WSNs are widely used in science, medical, and military applications. However, WSN has problems of small memory, weak processors, and the limited battery power. On the other hands, public key techniques provide powerful security, but they need high energy, memory, computation cost than the symmetric cryptography. Therefore, we propose a more efficient protocol than the existing protocols in WSN, which analyze RSA algorithm and simulate ECC algorithm in CC2420 which is a true single-chip 2.4Ghz IEEE 802.15.4 compliant RF transceiver designed for low-power and low voltage wireless application. We also compared our proposed protocol and other public key-based protocols.

Information Collection System of Electrical Equipment

Zig Bee is a focus on low-power, low-cost, low-complexity, low-rate short-range wireless network communication technology; it can well solve the high cost and poor real-time of wired data acquisition system. This paper presents a program to build environmental remote monitoring system based on Zig Bee wireless sensor network. The program uses TI's wireless RF transceiver chip CC2530 and the amount of the external circuit to design the hardware circuit of the sensor nodes and the coordinator node, and then design application software for sensor nodes and coordinator nodes on the basis of the Zig Bee protocol stack. The test results prove that the system can effectively monitor long-term stability of the environment of electrical equipment.

The Influence of Package Atmospheres on Resonance Performance of Micromechanical Radial-Contour Disk Resonator

Owing to high performance and tiny size, micromechanical radial-contour disk resonator as competitive candidate demonstrates an impressive prospect to replace traditional frequency selecting module in RF devices, so as to improve performance of modern RF transceivers. The influence of package atmospheres on resonance performance of micromechanical radial-contour disk resonator was investigated. By model construction and FEM calculation, resonance performance of micromechanical radial-contour disk resonator was analyzed, which indicate its resonance frequency as well as unique deformation style. In addition, effect on resonance performance of radial-contour disk resonator caused by package atmosphere was analyzed. The analysis result of resonance parameters variation of resonator immerged in different gases reveals that as the gas viscosity increases, the resonance frequency decreases. The phenomenon was interpreted by damping effect and recovery delay of disk deformation introduced by gases, which can be a reference for micromechanical resonator design and package selection in different applications.

Physical Layer Development Framework for OsmocomBB

The open source GSM protocol stack of the OsmocomBB project offers a versatile development environment regarding the data link and network layer. There is no solution available for developing physical layer baseband algorithms in combination with the data link and network layer. In this paper, a baseband development framework architecture with a suitable interface to the protocol stack of OsmocomBB is presented. With the proposed framework, a complete GSM protocol stack can be run and baseband algorithms can be evaluated in a closed system. It closes the gap between physical layer signal processing implementations in Matlab and the upper layers of the OsmocomBB GSM protocol stack. An embedded version of the system has been realized with FPGA and PowerPC to enable real-time operation. The functionality of the system has been verified with a testbed comprising an OpenBTS base-station emulator, a receiver board with RF transceiver and our developed physical layer signal processing system.

Electromagnetic assessment of embedded micro antenna for a novel sphincter in the human body

This paper presents a wireless, miniaturized, bi-directional telemetric artificial anal sphincter system that can be used for controlling patients' anal incontinence. The artificial anal sphincter system is mainly composed of an executive mechanism, a wireless power supply system and a wireless communication system. The wireless communication system consists of an internal RF transceiver, an internal RF antenna, a data transmission pathway, an external RF antenna and an external RF control transceiver. A micro NMHA (Normal Mode Helical Antenna) has been used for the transceiver of the internal wireless communication system and a quarter wave-length whip antenna of 7.75 cm has been used for the external wireless communication system. The RF carrier frequency of wireless communication is located in a license-free 433.1 MHz ISM (Industry, Science, and Medical) band. The radiation characteristics and SAR (Specific Absorption Rate) are evaluated using the finite difference time-domain method and 3D human body model. Results show that the SAR values of the antenna satisfy the ICNIRP (International Commission on Nonionizing Radiation Protection) limitations.

Design of WSN node for water pollution remote monitoring

A water pollution remote monitoring system based on Wireless Sensor Network is proposed for the protecting the ecological environment of water resources. WSN nodes are made from float-type fixed in the monitoring waters. The low power consumption C8051F930 is as the controller, the pH glass composite electrode sensors are used to measure pH, pH sensors collect the signal is processed, converted and disposed according to the potential measuring principle of pH composite electrode. Field data is transmitted and converted by the low power consumption wireless RF transceiver module Si4432, the water pollution of river basin is monitored by remote real-time.