594 research outputs found
Generating All Two-MOS-Transistor Amplifiers Leads to New Wide-Band LNAs
This paper presents a methodology that systematically generates all 2-MOS-transistor wide-band amplifiers, assuming that MOSFET is exploited as a voltage-controlled current source. This leads to new circuits. Their gain and noise factor have been compared to well-known wide-band amplifiers. One of the new circuits appears to have a relatively low noise factor, which is also gain independent. Based on this new circuit, a 50-900 MHz variable-gain wide-band LNA has been designed in 0.35-µm CMOS. Measurements show a noise figure between 4.3 and 4.9 dB for gains from 6 to 11 dB. These values are more than 2 dB lower than the noise figure of the wide-band common-gate LNA for the same input matching, power consumption, and voltage gain. IIP2 and IIP3 are better than 23.5 and 14.5 dBm, respectively, while the LNA drains only 1.5 mA at 3.3 V
UMTV: a Single Chip TV Receiver for PDAs, PCs and Cell Phones
A zero-external-component TV receiver for portable platforms is realized in a mainstream 8GHz-f/sub t/ BiCMOS process. Die size is 5/spl times/5mm/sup 2/ and power dissipation is 50mA at 3V. The receiver includes a single tunable LNA (3mA) with less than 5dB NF from 40 to 900MHz. The programmable IF filters cover all analog and digital standards
Effects of Power Line Communication on Radio Communication Equipment
Radio communication is a wireless transfer of information via power cable by Power Line Communication (PLC) and its dissemination through radio communication equipment.. However, this information causes signal interference, noise and distortion with the power line communication. This work analyzed the effect of PLC on radio communication equipment by interconnecting two high-speed PLC modems communicating with a data rate of up to 250 Mbit/s using telephone distribution wiring for radio spectrum to reduce the interference radiation that emanates from a power line. The measurements were made using a reference antenna at a distance of 3 m from the power line. The peak field-strength values were measured and recorded in the 30-350 MHz frequency range in horizontal and vertical polarization. The result shows that interference radiation occurring at frequencies up to 305 MHz, includes the FM band as well as the Digital Audio Broadcasting (DAB) band. It is expected that as the data rate of high speed modems increases, a corresponding increase in the interference radiation occurs at frequencies above 300 MHz. To this regard, administrations should take all practicable and necessary steps to ensure that the operation of power and telecommunication distribution networks do not cause harmful interference to a radio communication service. Keywords: PLC, Radio Communication, Interference, Noise, Distortion, Communication Equipment, Field Strength, DAB DOI: 10.7176/JNSR/9-16-04 Publication date: August 31st 201
Systems And Methods For Intelligent Policy Enforcement In Access Networks
Systems and methods of intelligent policy enforcement in access networks are disclosed. One such method is implemented in a network device and comprises updating a traffic history with information associated with an incoming packet arriving from or destined to a subscriber link. The method also comprises calculating a drop probability for a next traffic instant and predicting a traffic rate for each of a plurality of flows on the subscriber link. The method also comprises determining whether the incoming packet conforms to a traffic policy associated with the incoming packet. The method also comprises determining whether surplus bandwidth is available on the subscriber link. The method also comprises forwarding the packet responsive to the determination that the incoming packet does not conform and that surplus bandwidth is available.Georgia Tech Research Corporatio
Communications techniques and equipment: A compilation
This Compilation is devoted to equipment and techniques in the field of communications. It contains three sections. One section is on telemetry, including articles on radar and antennas. The second section describes techniques and equipment for coding and handling data. The third and final section includes descriptions of amplifiers, receivers, and other communications subsystems
Suitability of a commercial software defined radio system for passive coherent location
Includes abstract.
Includes bibliographical references (leaves 98-99)
DESIGN & SIMULATION OF MEMS VARIABLE CAPACITOR FOR OPTIMUM ANTENNA TRANSMISSION
The purpose of this project is to design and simulate the impedance matching
network or known as tuner which include MEMS variable capacitor that results in
wider range of frequency. The wireless communications and MEMS are widely used
in many applications such as Bluetooth, Global Positioning System (GPS) and
internet modem for its benefits. Nowadays, wireless communication system and
MEMS are developed every day. As the development of both industries grows, some
integrity signal issues such as reflection and impedance mismatch which caused
important signal loss become crucial. Signal loss is the phenomenon happen when
the transmitted signal is not fully received by the receiver during the transmission
session due to impedance mismatched. Therefore, to reduce any signal loss due to
impedance mismatch between transmitting and receiving antenna and with the
connected systems, an impedance matching network or known as tuner is required.
Since the demand for faster and smaller communication systems are increasing,
MEMS technology is the best choice in designing this tuner since MEMS is small in
size, light weight and enhanced performance and reliability. So, the MEMS tuner is
designed in this project where the device has capability to tune and match the input
impedance of the source with the load impedance of the antenna.
Basically this project is divided into two parts which is communication
systems and MEMS. For communication part, the impedance matching analysis and
parameter determination is done using MATLAB and ADS. The analysis shows the
range of capacitance value to reduce the signal loss by almost 50% is 5 pF to 10 pF.
For MEMS part, the MEMS structure design and simulation is done in the MATLAB
with reference capacitance value from the communication part which is 5 pF to 10
pF. From the MA TLAB simulation result, the device is shown to be driven by 110 V
and 71.4 pN of electrostatic force to move the parallel plate to achieve 3 pF to 8 pF
of capacitance value. This range of capacitance lies within the expected range of
capacitance. So, the MEMS variable capacitor can be tuner that reduces the signal
loss by 50% with the 3 pF to 8 pF range of capacitance
Analysis of interference to cable television due to mobile usage in the Digital Dividend
The start of use of mobile applications in the 800 MHz band, which forms part of the ‘Digital Dividend’, will cause interference to TV signals under certain conditions. The new mobile applications (called LTE, Long Term Evolution) use frequencies also used in cable TV networks. This report examines how much interference may occur when providing digital television over cable networks
Digital television applications
Studying development of interactive services for digital television is a leading edge area of work as there is minimal research or precedent to guide their design. Published research is limited and therefore this thesis aims at establishing a set of computing methods using Java and XML technology for future set-top box interactive services. The main issues include middleware architecture, a Java user interface for digital television, content representation and return channel communications.
The middleware architecture used was made up of an Application Manager, Application Programming Interface (API), a Java Virtual Machine, etc., which were arranged in a layered model to ensure the interoperability. The application manager was designed to control the lifecycle of Xlets; manage set-top box resources and remote control keys and to adapt the graphical device environment. The architecture of both application manager and Xlet forms the basic framework for running multiple interactive services simultaneously in future set-top box designs.
User interface development is more complex for this type of platform (when compared to that for a desktop computer) as many constraints are set on the look and feel (e.g., TV-like and limited buttons). Various aspects of Java user interfaces were studied and my research in this area focused on creating a remote control event model and lightweight drawing components using the Java Abstract Window Toolkit (AWT) and Java Media Framework (JMF) together with Extensible Markup Language (XML).
Applications were designed aimed at studying the data structure and efficiency of the XML language to define interactive content. Content parsing was designed as a lightweight software module based around two parsers (i.e., SAX parsing and DOM parsing). The still content (i.e., text, images, and graphics) and dynamic content (i.e., hyperlinked text, animations, and forms) can then be modeled and processed efficiently.
This thesis also studies interactivity methods using Java APIs via a return channel. Various communication models are also discussed that meet the interactivity requirements for different interactive services. They include URL, Socket, Datagram, and SOAP models which applications can choose to use in order to establish a connection with the service or broadcaster in order to transfer data.
This thesis is presented in two parts: The first section gives a general summary of the research and acts as a complement to the second section, which contains a series of related publications.reviewe
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