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This paper provides a description of a system for collision detection of vehicles within a simulated wireless network scenario. One kind are wireless sensor networks, which collect environmental data and disseminate them over the network. Another application is the field of car2car communication, which will become more and more important in future. A network of nodes within a car2car scenario is characterized...
The whitening-rotation (WR)-based semi-blind methods have been shown to achieve much better channel estimation performance than the conventional training-based methods for MIMO systems. In this paper, the performance analysis is conducted for an ideal WR-based method, in which the knowledge of the ideal whitening matrix is known a priori. This analysis is a valuable study since the ideal WR-based...
A novel and low complex data modulation technique that can be easily embedded in an impulse radio (IR) ultra wideband (UWB) receiver is presented. The synchronization in the receiver will depend of the transmitted signal and not of internal time synchronization. The technique allows the time acquisition and synchronization to be achieved in the receiver. The modulation scheme is proposed for 2 bits;...
This paper presents the the design of a digital down converter (DDC) using a digital Costas loop in a field programmable gate array (FPGA). To reduce the power dissipation we use the CIC filter to perform an efficient decimation, and then follow it with a finite impulse response (FIR) compensation filter that runs at a reduced sampling rate. The final results and performance measures are quantified...
Resonant clocking technologies are the next generation clocking technologies with GHz range frequency generation and effective power reduction features. The resonant standing wave oscillator technology (with mobius implementation) combines the advantages of resonant traveling wave oscillator and the traditional resonant standing wave oscillator. The high frequency in the mobius standing wave oscillator...
The present work proposes a portable electronic waveform generator for transcorneal electrical stimulation (TES). The waveform model is generated into a digital processor, and is based on a healthy eye's multi-focal electroretinogram (MF-ERG) response. The stimulation protocol proposed in this paper is qualitatively different from the one reported by others like Inomata et. al. Results show an improvement...
In this paper we make use of classical numerical optimization methods to design a second order band-pass continuous-time filter at 10.7 MHz in 0.35 mum CMOS technology. Our initial design is obtained using Level 1 MOSFET models whose parameter values are extracted from high-level models by numerical optimization. We then replace all transistors by Level 49 MOSFET models and re-optimize the frequency...
A fuzzy-set-based approach is presented to compute the optimum sizes of a Voltage Follower (VF). The proposed approach defines fuzzy sets to represent the gains closer to unity and higher bandwidths of the VF. The gains and band-widths are obtained from several Monte Carlo simulations in order to compute the optimum sizes through the application of fuzzy set intersection, subject to a lower bound...
Proposed post-clock-tree-synthesis (CTS) optimization method is delay buffering at the leaves of the clock tree to implement a limited version of clock skew scheduling. The method suggests the limitation of delay buffering on each clock tree branch as well as a global monitoring of total amount of delay buffering to improve the circuit performance. The delay buffering for non-zero clock skew operation...
In this paper, the design of a fully-integrated CMOS distributed paraphase amplifier incorporating derivative superposition linearization that allows for broadband distortion reduction is presented. Simulation results has yielded a peak S21 power gain of 5.3 dB and then rolls off to a unity gain bandwidth of 8.2 GHz with less than 10deg phase imbalance and amplitude imbalance of less than 1.26 dB...
The feasibility of using standard 0.18mum CMOS technology for low cost wideband monolithic microwave integrated circuits (MMICs) at ~27GHz is demonstrated. Three monolithically integrated distributed voltage controlled oscillators (DVCOs) with a novel gain cell comprising of n-FET common source with p-FET current-source load are designed. Two of the DVCO's have 3 stages of the gain cell while the...
In this work, the design of a CMOS Class E power amplifier (PA), for low-power and low-cost biomedical devices is presented in a standard 0.13 mum CMOS technology. The PA employs Class E topology to exploit its soft-switching property for high efficiency. A differential Common-Gate (CG) structure is employed to achieve a highly symmetrical topology, there by reducing the significant distortion in...
A video ghost canceller, which reduces the effect of multi-path signal echoes (ghosts), is described in this paper. An adaptive LMS algorithm was used to improve the received image quality of PAL or NTSC broadcasts. The internal 576-tap digital filter, which is comprised of a 144-tap FIR and a 430-tap IIR filter, cancels ghosts occurring from -6.15 muS before to +41.6 muS after the main signal. In...
In this paper, we propose a circuit model of the multi-walled carbon nanotube (MWCNT) based on our one-dimensional fluid model, which describes the electron transport in single-walled carbon nanotube (SWCNT). The performances of MWCNT and SWCNT in high frequency (RF/microwave) applications are then simulated using these models and compared with Cu interconnect. Simulations show that MWCNT interconnects...
Regular expression matching has been widely used in network intrusion detection systems due to its strong expressive power and flexibility. To match multiple regular expression patterns simultaneously, compiling multiple regular expressions into a composite DFA is an intuitive and efficient way. However, traditional memory architecture suffers from the problem of memory explosion for certain complex...
Ensuring stable operation is perhaps one of the most challenging aspects of designing a power-supply circuit because the load is dynamically unpredictable and widely variable. Unfortunately, the nonlinear dynamics of switch-mode converters accentuate these difficulties, especially when considering conventional analytical techniques rely on abstract mathematics to describe ac switching events that...
A delay-locked loop (DLL) regulated single-inductor multiple-output (SIMO) power converter is presented. It takes advantage of the fast phase locking property of a DLL to identify the SIMO converter's regulation errors between the output voltages and their corresponding references. In response to these errors, an adaptive peak current modulation technique is proposed to adjust the instantaneous duty...
In this paper, a new technique for realizing area efficient, low noise filters is introduced. The proposed filter topologies utilize noise shaping techniques to shift the noise of the passive and active filter components out of the pass band of the filter. This is illustrated by implementing a 5th-order noise-shaped post mixer gain-filtering circuit in a 65-nm CMOS process. The proposed circuits consume...
This paper proposes a flexible low density parity check encoder. This encoder simplifies the calculations found in other flexible encoders by increasing memory usage, allowing for parallelization and faster encoding. The flexibility of this encoder allows it to be used in emerging multi code applications and standards. To evaluate the encoder, a Verilog description was developed and synthesized on...
This paper addresses and solves the trajectory tracking problem for the planar dynamics of a thrust vectored airship. The proposed controller is based on a combination of two nonlinear control design techniques, backstepping and exact tracking error dynamics passive output feedback (ETDPOF). Numerical simulations show the performance of the proposed controller and some concluding remarks complete...
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