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Signal strength (SS) based tag estimation significantly improves the accuracy and speed of RFID tag interrogation. In, SS estimation was applied to a Manchester based RFID system and a formula for the lower bound on number of tags was derived. This paper analytically extends this analysis to a comprehensive list of encoding formats including all those used in commercially available tags. The developed...
This paper presents the use of local oriented energy features for real-time object tracking on embedded vision systems. Local oriented energy features are extracted using complex Gabor filters. Filtering is carried out across multiple channels with different frequencies and orientations. The effectiveness of the chosen feature set is tested using a mean-shift tracker. Our experiments show that adding...
This paper analyses a filter known as the Tau Cell using symbolic methods and shows that the operation of this filter is independent of the magnitude of the input DC offset. This means that the circuit places no restrictions on whether the input DC offset is a sub-threshold current or not. The circuit behaviour predicted from symbolic analysis was observed in similar circuits on a chip fabricated...
Increasing application of Gabor feature space in various computer vision tasks and its high computational demand, encourages using parallel computing technologies. In this work we have designed a high throughput GPU based Gabor kernel that mimics the function of initial biological visual cortex layers namely `Simple' and `Complex' cells. The kernel is basically a Gabor filter bank with adjustable...
We implemented a Symbolic Circuit Analysis Software toolbox based on Affine Arithmetic. The toolbox is defined with small signal Affine MOSFET models along with conventional MOSFET models. As a case study the demonstration compares the use of affine models with conventional models in various circuit architectures. The symbolic analysis results are also compared with SPICE analysis results. This demonstration...
A CMOS temperature compensated circuit used in measuring relative ultrasound energy is presented in this paper. The core of the circuit is a temperature compensated voltage to current squarer (VCSQ) and a current integrator. The VCSQ consists of a Linear-Transconductor(LTC) and a current-mode squarer. A current source (dependent on MOS transconductance which is in turn dependent on absolute temperature)...
We modified small-signal MOSFET models with affine arithmetic concepts. The model elements were redistributed so they are meaningfully grouped and better correlated. The modified models are more compact, easier to handle (even at the highest accuracy level the model leads to simpler circuit expressions) and provide better insight into the analysis of large analog circuits. The results presented in...
This work gives insight into the behaviour of second-order bang-bang phase locked loops in the far from lock region. This region, while largely unexplored, is of particular interest as PLL behaviour in this region determines locking time and capture range. By analysing PLL cycle slipping behaviour in this region, the transient response for the system is derived. Expressions for first-order system...
Recently there has been a need to incorporate the use of mobile computing devices in hospital or clinical applications, to enhance patient care. The advancement of wireless technology has created unique mechanisms of interaction that can meet the needs of e-health system robustness, reliability and accuracy requirements. This paper presents an interactive wireless medical information system that allows...
This paper has reported on the design and development of an FPGA based 2times2 MIMO testbed employing commercially available MAX289 RF transceiver chips and in-house developed antennas. Details of the operation of various parts of this system have been described. A particular attention has been paid to symbol synchronization which is crucial to achieving the data demodulation, channel estimation,...
Intelligent video surveillance is currently a hot topic in computer vision research. The goal of intelligent video surveillance is to process the captured video from the monitored area, extract specific information and take appropriate action based on that information. Due to the high computational complexity of vision tasks and the real-time nature of these systems, current software-based intelligent...
This paper reports on the development of a semi-blind channel estimation algorithm that is aimed for inclusion in a 2times2 multiple input multiple output (MIMO) system. The system employs a field programmable gate array (FPGA) for fast processing of transmitted data. Its RF part is built using commercially available components and in-house developed antennas. FPGA hardware is used for fast processing...
The paper describes a Multiple Input Multiple Output communication testbed for operation in a dual 2.4 GHz/5 GHz band, which is under development at the University of Queensland. This advanced testing equipment makes use of Field Programmable Gate Array technology for fast processing of the baseband signals. Its RF modules include commercially available RF transceiver chips and in-house developed...
The wireless sensor node architecture proposed in this paper is optimized for use in a wireless interactive point, listen and see system. In particular, we focus on developing a wireless sensor node that can be remotely charged by harvesting microwave energy. The current system implementation allows a user to access information from a remote sensor via their mobile computing device. These sensors...
The paper reports on investigations into semi-blind channel estimation for a 2times2 multiple input multiple output (MIMO) system employing the Alamouti coding scheme. The proposed technique is based on an iterative version of Maximum Likelihood technique and uses a suitable weighting of channel matrices in the current and last iterations. In the presented investigations, it is assumed that the channel...
This paper presents a simulation tool targeted specifically at bang-bang type phase locked loop systems. The aim of this simulator is to quickly and accurately predict important PLL transient characteristics such as capture range, locking time, and jitter. We present a behavioral model for bang-bang type PLLs, and show how the application of this model in a simulator can speed up simulation time by...
This paper demonstrates how the MIX-SYN framework can fast-track the design of analogue and mixed-signals integrated circuits, traditionally designed using time-consuming techniques. By integrating different levels of design abstraction and their simulation environments, MIX-SYN aims to bridge the existing design discontinuity of transferring algorithm to functional design. It does not perform general...
In this paper, a channel emulator for assessing the performance of MIMO testbed implemented in a field programmable gate array technology is described. The FPGA based MIMO system includes a signal generator, modulation/demodulation and space time coding/decoding modules. The emulator uses information about a wireless channel from computer simulations or actual measurements. In simulations, a single...
SoC design methodology is totally dependent on the availability of reliable, easily interfaced and well supported IP cores. Complex cores such as microprocessors can be very expensive if licenced from commercial providers. Research projects, and even small companies, look for open source cores despite the problems associated with this source. The Rachael embedded processor discussed in this paper...
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