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Acquisition of periodic waveforms is an integral part of characterizing high speed system performance. Various techniques are used to reduce the equipment cost, dominated by the cost of the digitizer. Incoherent under-sampling provides an attractive solution for signal acquisition. However, due to the aliasing present in under-sampled signal and the windowing effects, high resolution spectral estimation...
Bandwidth aggregation of heterogeneous wireless links faces numerous challenges in maximizing available connectivity services for mobile applications. One serious issue is the out-of-sequence arrival of packets at receiver that is amplified by distribution of packets of a flow over multiple paths. These packets experience asymmetric path characteristics that results in diverse congestion states for...
It is becoming more and more common to use Autonomous Underwater Vehicles to perform tasks underwater. The use of this vehicles is affordable and its use doesn't raise any significant risk nor does it requires any human intervention. The traditional applications for the use of such vehicles were related with bathymetric tasks. But nowadays AUVs are being more and more used for variety of missions...
A fundamental problem when locating sensors in a network is to estimate the distance between pairs of sensors. Since security of sensor networks is vulnerable in the wireless environment, this paper proposes a secure ranging scheme which can provide secure position information for wireless sensor applications. By generalizing the asynchronous distance estimation technology (Distance Estimation via...
This paper studies the wireless positioning method using digital TV (DTV) signals with orthogonal frequency division multiplex (OFDM) modulation. A novel pseudo range estimation method is proposed, which utilizes the synchronization modules in the data demodulation as the signal acquisition for the coarse time delay estimation and introduces a data-directed delay tracking mechanism for the fine time...
The problem of inferring side information regarding an underwater acoustic (UWA) channel from the environmental signature imprinted on waveforms by the propagation medium, particularly the transmitter/receiver configuration and relative speed vector, is addressed in this paper. The main contribution of this work is to develop techniques to automatically deal with wavefront classification, i.e., to...
Floating car data (FCD) has been used to collect traffic state information from a set of individual vehicles. Vehicles are equipped with On Board Units (OBU) that collect different measurements and the vehicle position and transmit the data to a remote control center. In current implementations of FCD systems, vehicle fleets use cellular connections for data transmission. In this paper we consider...
With the advancements in semiconductor process technologies in recent years, noise management has become more difficult. Therefore power distribution network (PDN) design has become more important. This paper describes the target impedance build method. The key techniques are to find the impedance border line of normal chip operation and to set the target impedance which does not exceed that border...
In Delay and Disruption Tolerant Networks (DTNs), the message delivery rate is impacted by the buffer management policy adopted by nodes once buffer overflows occur frequently. This paper proposes two new buffer management policies. The first one, called LPS (Less Probable Sprayed), uses the messages delivery probability and estimates the number of replicas already disseminated to decide which message...
Sophisticated voice source estimation techniques, such as closed-phase pitch synchronous inverse filtering method, relay on accurate estimates of glottal closure instants (GCIs). In this paper, a group delay approach to GCI estimation is presented. Specifically, the average group delay and the energy weighted group delay measures are discussed in detail. We propose an improvement to the implementation...
Finding the available network capacity for a TCP connection is an important research problem as it allows the connection to improve its throughput and fairness in addition to reducing packet losses. As flows arrive and depart randomly in the network, the state of a TCP connection at any instant is very dynamic and a good estimate of the available capacity can enable TCP to quickly adapt to the actual...
Inter contact time (ICT) between two mobile nodes is essential to forwarding algorithms and the end-to-end delay in Delay Tolerant Networks (DTNs). However, studies regarding the distribution of ICT lack general applicability and the exponential parameter concerns with too many motion characteristics. Consequently, it is difficult to design the protocol and analyze the performance for DTNs. In this...
Disruptions, high dynamism and no end-to-end communication are some of the Vehicular Delay-Tolerant Networks (VDTNs) main characteristics. This paper describes the implementation of a new VDTN multicast routing protocol which makes use of knowledge about previous encounters to estimate congestion and density and better spread data bundles and limit the number of copies to reduce overhead. After a...
This paper presents the Self Adapting Receiver Initiated MAC protocol (SARI-MAC), a novel asynchronous MAC protocol for energy constrained Wireless Sensor Networks. SARI-MAC self-adapts to the traffic load to meet specified Quality of Service requirements at the lowest energy cost possible. To do so, SARI-MAC relies on traffic estimation, duty-cycle adaptation and acknowledgement mechanisms. Our performance...
Due to the economy recession all around the world, the performance of manufacturing industry has been significantly affected. The question of how to generate fast response to customers, maintain the high quality, accurate delivery rate and low risk become the crucial issue of keeping a company competitive. Supplier selection, one of the key factors for a successful production process has attracted...
3D imaging capable devices have been available on the market for a few years now and the availability of 3D contents is also picking up. However, 3D contents available for viewing is not growing fast enough to meet the demand. To compensate for such a problem, most 3D imaging devices are equipped with 2D to 3D conversion function. Also, common 3D contents available are mostly produced with 2 view...
In Partially Connected Networks, the hop-by-hop forwarding scheme usually ignores the existence of multi-hop path segments, and therefore miss some good forwarding opportunities. In this paper, we proposed a new hybrid routing algorithm that combines the positive aspects of DSR and asynchronous routing in DTN, called Mobile Tendency Based Hybrid Routing (MTHR). MTHR utilizes a multi-hop neighbor discovery...
In this paper, we propose an improvement to the EPC Class1 Gen2 standard for RFID networks by adding randomness to the transmission process. To this end, we introduce a new parameter in the packets exchanged between the reader and the tags. We analyze the behavior of our proposal by regarding the identification delay, the number of used slots, and the average number of identification cycles. With...
As it is widely known, cooperation among base stations can improve spectral efficiency, particularly at cell edges. In theory, the problem is well understood, but the application of those advanced transmission techniques in practical deployments issues multiple challenges, some of which are very difficult to model in simulation studies. In this paper we investigate the properties of intra and inter-site...
This work presents a synthesis framework that generates a formally verifiable RTL from a high level language. We develop an estimation model for area, delay and power metrics of arithmetic components for Xilinx Spartan 3 FPGA family. Our estimation model works 300 times faster than Xilinx's toolchain with an average error of 6.57\% for delay and 3.76\% for area estimations. Our framework extracts...
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