ICCSC'02. 1st IEEE International Conference on Circuits and Systems for Communications. Proceedings (IEEE Cat. No.02EX605)
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DCT processor architecture based on computation sharing
- Trang 162-165
In this paper, we present a new discrete cosine transform (DCT) processor architecture using computation sharing multiplication (CSHM). We introduce a computation sharing multiplier based DCT architecture to achieve image quality and hardware complexity trade-off and analyze the performance. Comparison of the performance, area and power consumption with a DA (distributed arithmetic) based DCT arch......
#Discrete cosine transforms #Computer architecture #Image quality #Signal processing algorithms #Energy consumption #Image coding #Matrix decomposition #Power engineering computing #Computational Intelligence Society #Hardware
Analysis of reconfigurable and heterogeneous architectures in the communication domain
- Trang 190-193
One of the most challenging design issues for next generations of (mobile) communication systems is fulfilling the computational demands while finding an optimum trade-off between flexibility and implementation aspects, especially power consumption. Flexibility of modern architectures is desirable, e.g. concerning adaptation to new standards and reduction of time-to-market of a new product. Typica......
#Computer architecture #Costs #Mobile communication #Mobile computing #Energy consumption #Time to market #System-on-a-chip #Field programmable gate arrays #Signal processing #Digital control
CAD of RF and microwave filters for wireless communications
- Trang 308-311
This paper presents the CAD of RF and microwave filters such as lumped element, combline and waveguide bandpass filters for wireless communication systems. A new high-Q periodic resonator has been used for combline filter applications. A significantly higher Q factor than that for a conventional combline resonator in the same volume has been achieved.
#Radio frequency #Microwave filters #Wireless communication #Resonator filters #Band pass filters #Insertion loss #Low pass filters #Chebyshev approximation #Q factor #Propagation losses
Cellular neural network in image filtration tasks
- Trang 267-270
The mathematical model of cellular neural network (CNN) working in discrete time is considered. The possibility of such devices for computation of the convolution of two-dimensional digital signal with a given kernel is shown. The algorithm of construction of a difference equation with constant coefficient, which has the solution of the demanded convolution is given. The hardware implementation of......
#Cellular neural networks #Intelligent networks #Filtration #Image processing #Convolution #Difference equations #Smoothing methods #Telecommunication computing #Concurrent computing #Voltage
Novel internal antenna for cellular phones
- Trang 344-345
The use of cellular phones gives rise to the problem of hand-held transceiver radiation in the direction of a user's head. This problem can be partially solved by using an antenna with a radiation pattern decreasing the electromagnetic radiation in the user's head direction and increasing it in the opposite direction. The suggested antenna is a combination of a patch antenna and two short dipoles.......
#Cellular phones #Dipole antennas #Directive antennas #Frequency #Microstrip antennas #Slot antennas #Slabs #Antenna radiation patterns #Electromagnetic radiation #Permittivity
First-order allpass filter realisation using a modified third generation current conveyor
- Trang 66-69
A new first-order allpass filter configuration using a modified third-generation current conveyor is presented. In order to illustrate the usefulness of the proposed circuit, a very high-Q bandpass filter is designed using the proposed allpass sections. The main parameters of the resulting high-Q bandpass filter, i.e. the center frequency and pole-Q can be independently adjusted by changing the va......
#Active filters #Band pass filters #Frequency #Resistors #Analytical models #Circuit simulation #Operational amplifiers #Bandwidth #Circuit topology #Electronic mail
Synthesis of high-frequency wave filters and transformers for communications systems
- Trang 320-325
The new theory of wave filters and their synthesis is presented for the first time on the basis of a modeling method using circuit models made exclusively from the first order phase parts. The method is applicable for the synthesis of the filters on transmitting line pieces and may be used for the design of microwave, acoustic, optical and mechanical filters with Butterworth, Chebyshev, elliptic a......
#Transformers #Microwave filters #Optical filters #Filtering theory #Circuit synthesis #Microwave theory and techniques #Frequency conversion #Network synthesis #Communication systems #Chebyshev approximation
Image processing based on two-dimensional first order digital filters
- Trang 130-133
Depending on the noise, present in the image, the digital filter processing it should be synthesized to ensure the greatest possible efficiency of processing, as for elimination of different types of noise it is necessary to use the filter with the relevant characteristics. The processing of the noisy images by two-dimensional recursive and nonrecursive first order digital filters is surveyed.
#Image processing #Digital filters #Low pass filters #Band pass filters #Frequency #Nonlinear filters #Digital images #Real time systems #Radar imaging #TV
A lumped, large-signal dynamic model of the mosfet for RF circuit simulation
- Trang 312-315
We present a lumped, large-signal dynamic model of the MOS transistor that is derived from a partial differential equation model of the transistor. The new model is a ladder network in which each series arm is a nonlinear conductance and each shunt arm a nonlinear charge "store." The network variables are localized surface potentials, surface charge densities, and currents. We test the model again......
#MOSFET circuits #Radio frequency #Circuit simulation #Partial differential equations #Circuit testing #Differential equations #Computational modeling #Application specific integrated circuits
VLSI design of CMOS image-reject LNA for 950-MHz wireless receivers
- Trang 330-333
This paper presents the design of a CMOS integrated image reject low noise amplifier (IR-LNA) for application to 950 MHz low power, low voltage wireless receivers. A second-order active band-pass filter using an integrated inductor is incorporated into the LNA core to reject the 1.6 GHz image signal without achieving high Q values. The circuit proves to be suitable for highly integrated CMOS recei......
#Very large scale integration #CMOS technology #Low-noise amplifiers #Low voltage #Band pass filters #Active inductors #Wideband #Integrated circuit technology #Gain #Noise figure