ppxscal/embedding_network huggingface dataset:
5G mobile phone concept
Authors: Toni Janevski
Venue: Proceedings of the 6th IEEE Conference on Consumer Communications and Networking Conference (2009)

Today 3G mobile systems are on the ground providing IP connectivity for real-time and non-real-time services. On the other side, there are many wireless technologies that have proven to be important, with the most important ones being 802.11 Wireless Local Area Networks (WLAN) and 802.16 Wireless Metropolitan Area Networks (WMAN), as well as ad-hoc Wireless Personal Area Network (WPAN) and wireless networks for digital TV and radio broadcast. Then, the concepts of 4G is already much discussed and it is almost certain that 4G will include several standards under a common umbrella, similarly to 3G, but with IEEE 802.xx wireless mobile networks included from the beginning. The main contribution of this paper is definition of 5G (Fifth Generation) mobile network concept, which is seen as user-centric concept instead of operator-centric as in 3G or service-centric concept as seen for 4G. In the proposed concept the mobile user is on the top of all. The 5G terminals will have software defined radios and modulation scheme as well as new error-control schemes can be downloaded from the Internet on the run. The development is seen towards the user terminals as a focus of the 5G mobile networks. The terminals will have access to different wireless technologies at the same time and the terminal should be able to combine different flows from different technologies. Each network will be responsible for handling user-mobility, while the terminal will make the final choice among different wireless/mobile access network providers for a given service. The paper also proposes intelligent Internet phone concept where the mobile phone can choose the best connections by selected constraints and dynamically change them during a single end-to-end connection. The proposal in this paper is fundamental shift in the mobile networking philosophy compared to existing 3G and near-soon 4G mobile technologies, and this concept is called here - the 5G.
Context-based services discovery in mobile environments
Authors: Y. Bouzid, H. Harroud, M. Boulmal, A. Karmouch
Venue: Proceedings of the 16th international conference on Telecommunications (2009)

Mobile and Ubiquitous computing have increased the need for mobile users to expect accessing preferred services, whenever they want and wherever they are. Users do not have to explicitly specify and configure their working environment each time they move from one location to another. The necessary adaptation to cope with the changing environment should be initiated by services rather than by users. This paper presents a context-aware platform for supporting mobile users with personalized services. The platform is capable of handling different types of context sources (i.e. sensors, readers, agents), offers sophisticated mechanisms in matching the mobile user's preferences with services that are enabled at the visited location, and provides these services in personalized and adaptive manner to the user conditions. As a proof of concept, we present an context sensitive instant messaging prototype where a user is provided with services and information of interest based on location and time. The platform monitors a set of policies to dynamically adapt each application behavior to the situation of its use.
A compressed sensing approach for biological microscopic image processing
Authors: Marcio M. Marim, Elsa D. Angelini, J.-C. Olivo-Marin
Venue: Proceedings of the Sixth IEEE international conference on Symposium on Biomedical Imaging: From Nano to Macro (2009)

In fluorescence microscopy the noise level and the photobleaching are cross-dependent problems since reducing exposure time to reduce photobleaching degrades image quality while increasing noise level. These two problems cannot be solved independently as a post-processing task, hence the most important contribution in this work is to a-priori denoise and reduce photobleaching simultaneously by using the Compressed Sensing framework (CS). In this paper, we propose a CS-based denoising framework, based on statistical properties of the CS optimality, noise reconstruction characteristics and signal modeling applied to microscopy images with low signal-tonoise ratio (SNR). Our approach has several advantages over traditional denoising methods, since it can under-sample, recover and denoise images simultaneously. We demonstrate with simulated and practical experiments on fluorescence image data that thanks to CS denoising we can obtain images with similar or increased SNR while still being able to reduce exposition times.
Full diversity high data rate MIMO scheme with maximal ratio combiner for quasi-static Rayleigh fading channel
Authors: Nizar Ouni, Ridha Bouallegue
Venue: Proceedings of the 16th international conference on Telecommunications (2009)

This paper, mainly, aims to present a full diversity scheme in the presence of a quasi-static Rayleigh fading channel and an MRC combiner in the receiver. This scheme is based on the fact that transmitted signal will be divided on several transmit antennas. Such scheme reduces the transmission time and increase the data rate. We will present a generic BER equation for this scheme and illustrate our approach with Matlab simulation results and compare analytical results with a simulation of such MIMO scheme.
Identification of load pockets and market power in electric power systems
Authors: Bernard C. Lesieutre, Robert J. Thomas, Timothy D. Mount
Venue: Decision Support Systems (2005)

In this paper, we present a spectral method for the identification of load pockets and the application of practical techniques for the measurement of market power. Market power is a serious concern in electric energy markets, especially in the area of a load pocket. Common definitions for market power, which rely on a comparison between market prices and a so-called competitive price, are difficult to use in practice because the competitive price is not known when the market is not competitive. The competitive price cannot be computed from data naturally available to the market. Our technique focuses on the identification of participants with the ability to increase revenues by increasing prices, an ability not present in a competitive market. We then propose measures for quantifying the extent to which market power is being exercised. These measures can be computed from data available to the market; they are practical. We present results from a 30 bus, 6 generator system, which illustrates that generators in a load pocket have and can exploit joint market power.
Generalized Chu polyphase sequences
Authors: J. S. Pereira, H. J. A. Da Silva
Venue: Proceedings of the 16th international conference on Telecommunications (2009)

The perfect sequences are so ideal that all out-of-phase autocorrelation coefficients are zero. A method to generate a prime number N of perfect sequences with length N is presented. Moreover, these new sets have one more perfect sequence than Chu polyphase sets with the same maximum absolute value of periodic cross-correlation, and are slightly better for asynchronous direct sequence code division multiple access (DS-CDMA). The new sequences are more robust than Chu sequences when used with M-ary quadrature amplitude modulation (QAM). The reason for this improvement is that the new sequences are designed to be orthogonal to the M-ary QAM carriers. Other sequence transformations are also suggested and may be used to obtain many other perfect sequences with the same correlation properties. For example, the new sequences can be transformed into quadriphase sequences, also with good correlation properties.
Frequency synchronization for TDS-OFDM system with transmit diversity
Authors: Dengbao Du, Jintao Wang, Bing Han, Zhixing Yang
Venue: Proceedings of the 16th international conference on Telecommunications (2009)

This paper proposes a frequency synchronization algorithm for time domain synchronous Orthogonal Frequency Division Multiplexing (TDS-OFDM) system with multiple antenna transmit diversity. The training sequences used in the transmit diversity TDS-OFDM system are orthogonal and have near-optimal autocorrelation property, and the carrier frequency offset (CFO) estimation algorithm is based on these properties. From computer simulations, the proposed frequency synchronization method performs better when increasing the number of the transmit antenna in AWGN environment, and the estimated CFO can make the carrier-to-interference ratio be greater than 20dB even over time-varying multipath channels with SNR=10dB.
Learning disease severity for capsule endoscopy images
Authors: R. Kumar, P. Rajan, S. Bejakovic, S. Seshamani, G. Mullin, T. Dassopoulos, G. Hager
Venue: Proceedings of the Sixth IEEE international conference on Symposium on Biomedical Imaging: From Nano to Macro (2009)

Wireless capsule endoscopy (CE) is increasing being used to assess several gastrointestinal(GI) diseases and disorders. Current clinical methods are based on subjective evaluation of images. In this paper, we develop a method for ranking lesions appearing in CE images. This ranking is based on pairwise comparisons among representative images supplied by an expert. With such sparse pairwise rank information for a small number of images, we investigate methods for creating and evaluating global ranking functions. In experiments with CE images, we train statistical classifiers using color and edge feature descriptors extracted frommanually annotated regions of interest. Experiments on a data set using Crohn's disease lesions for lesion severity are presented with the developed ranking functions achieve high accuracy rates.
Active vibration control of aerospace structures using a modified positive position feedback method
Authors: S. Nima Mahmoodi, Mohammad Rastgaar Aagaah, Mehdi Ahmadian
Venue: Proceedings of the 2009 conference on American Control Conference (2009)

A Positive Position Feedback controller is modified and a new active vibration control technique is developed. Unlike the conventional Positive Position Feedback, the new controller separates the damping and stiffness control using two parallel first order and second order compensators. The second order compensator has a damping ratio as low as the damping of flexible structure to provide periodic vibration control. Simultaneously, the high damping is made available through a first order compensator. The new controller is applicable to a strain-based sensing/actuating approach and can be extensively applied to piezoelectrically controlled systems. Control gains are obtained by performing the stability analysis. The controller is verified experimentally using a plate vibration suppression setup. The plate is controlled through two piezoelectric patches and its vibrations are monitored by ten sensors mounted on the surface of the plate. The results confirm that the new controller is able to provide good vibration reduction, with the ability to be used to simultaneously control more than one natural frequency.
The Gray-Wyner network with a limited-rate helper to the encoder and decoders
Authors: Lei Zhao, Haim Permuter
Venue: Proceedings of the 2009 IEEE international conference on Symposium on Information Theory - Volume 2 (2009)

In this paper, the Gray-Wyner network with a limited-rate helper is investigated. The helper sends a common message to the encoder and the decoders. We characterize the complete rate region. Successive refinement with a limited-rate helper is treated as a special case. The rate region for a Gaussian source with squared error distortions is explicitly calculated.
On the design of a point-to-multipoint Gigabit WLAN system on 60 GHz millimeter wave
Authors: Yukimasa Nagai, Mari Ochiai, Akinori Taira, Takahira Yamauchi, Naoki Shimizu, Akihiro Shibuya
Venue: Proceedings of the 6th IEEE Conference on Consumer Communications and Networking Conference (2009)

Increasing demand on the broadband wireless communication over Gigabits has focused renewed attention on 60 GHz millimeter wave. We developed a novel Point-to-Multipoint (P2MP) Gigabit WLAN System on 60 GHz millimeter wave. The proposed system employed wide angle beams antenna overcomes the usability of the conventional system, covers larger areas. Maximum transmission rate was designed to be 1.2 Gigabit/sec. Orthogonal frequency division multiplex (OFDM) using 1024 points FFT, and convolutional code were implemented with PHY layer of the WLAN equipments. Superframe for multiple beams and frame aggregation for high throughput were designed for MAC layer. All control channels for downlink such as broadcast, frame control and access feedback were aggregated to reduce overhead in addition to aggregation of data frame. Maximum improvement of throughput due to control channel aggregation was evaluated to be 200 % compared with individual transmission. Evaluated throughput using proposed frame aggregation was confirmed to be more than 852 Mbit/sec in the case of aggregation size of 16 × 1500byte.
Segmenting crossing fiber geometries using fluid mechanics tensor distribution function tractography
Authors: Nathan Hageman, Alex Leow, David Shattuck, Liang Zhan, Paul Thompson, Siwei Zhu, Arthur Toga
Venue: Proceedings of the Sixth IEEE international conference on Symposium on Biomedical Imaging: From Nano to Macro (2009)

We introduce a fluid mechanics based tractography method that estimates the most likely connection path between points in a tensor distribution function (TDF) dataset. We simulated the flow of an artificial fluid whose properties are related to the underlying TDF dataset. The resulting fluid velocity was used as a metric of connection strength. We validated our algorithm using a digital phantom dataset based on a pattern with two intersecting tracts. When compared to a TDF streamline method and our single tensor fluid mechanics tractography algorithm, our method was able to segment intersecting tracts at a finer spatial resolution. Our method was successfully applied to human control data to segment a major fiber pathway, the corpus callosum, even in problematic regions with crossing fiber geometries.
An effective cross layer-based video streaming algorithm over mobile ad hoc network
Authors: Gyeong Cheol Lee, Hwangjun Song
Venue: Proceedings of the 6th IEEE Conference on Consumer Communications and Networking Conference (2009)

This work presents an effective cross-layer video streaming algorithm over mobile ad hoc networks. The proposed algorithm selects the most efficient PHY mode of IEEE 802.11 multi-rate service based on the information available at the application, MAC, and physical layers at each node in the distributed way in order to minimize end-to-end delay and remain packet loss rate in tolerable range at the final destination. Finally, experimental results are provided to show the superior performance of the proposed algorithm.
A secure DVB set-top box via trusting computing technologies
Authors: Onur Acriçmez, Jean-Pierre Seifert, Xinwen Zhang
Venue: Proceedings of the 6th IEEE Conference on Consumer Communications and Networking Conference (2009)

This paper presents a very natural "killer application" of modern Commercially Off The Shelf (COTS) available Trusted Computing technologies. The application which we propose is a secure and cost optimized DVB Set-top Box. Our respective reference architecture is exclusively build upon such COTS Trusted Computing technologies and completely avoids the use of any proprietary and thus expensive hardware. Particularly, we will use an orchestration of the following TC concepts from the PC field and standardized by the Trusted Computing Group: Secure Boot, Remote Attestation, Trusted Channels, Virtualization for Domain Isolation, and the Trusted Platform Module (TPM). The Trusted Domain Isolation concept (as realized through Trusted Virtualization) allows the simple subscription to different Service Providers (SP) without the need of any SP-specific hardware requirements. The vast computing power of modern CPU architectures allows for the pure software virtualization of any SP-proprietary hardware. In addition to that isolation concept, the novel hardware assisted security ingredients of modern CPUs allow in combination with the TPM for a verifiable evidence of a tamper-free execution environment for the different SP's. I.e., at all times during the execution of a SP's "virtual set-top box", the respective SP is able to remotely request an attestation of the whole execution platform and ensure its fundamental system integrity. This attestation proves either that no "malicous platform tampering" or "unintended platform use" is happening, or in case that it fails, it gives the SP the possibility to deny further services by simply cutting the content delivery channel. Thus, at all times we can guarantee the various SP's strong security assurances. Moreover, the nowadays very well understood and very efficient (even real-time capable!) virtualization concept allows a simple and efficient migration of different SP architectures to such a universal DVB Set-top Box. In some cases a simple binary migration with only little modifications might be possible. Also, our architecture inherently supports the easy integration of an open but strongly isolated user partition, thus allowing the user for a kind of his own PC within his home TV and Set-top Box combination. Moreover, this also allows for an elegant realization of very recent initiatives aiming to merge the home TV experience with the full Web experience (e.g. See'N'Search [27]). In addition to being a very natural killer application of such Trusted Computing technologies the DVB Set-top Box example touches also on the very important and subtle scalability issue of the Trusted Computing paradigm.
Radio resource allocation for relay enhanced cellular systems
Authors: Yong Liu, Chiu Ngo
Venue: Proceedings of the 6th IEEE Conference on Consumer Communications and Networking Conference (2009)

Relay enhanced cellular (REC) system and orthogonal frequency division multiple access (OFDMA) technology are regarded as the key features of 4G communication systems. How to utilize resource wisely in OFDMA-based REC systems is an important and challenging research topic. This paper reviews the major issues in designing radio resource management (RRM) algorithms for REC systems. A new resource allocation algorithm is proposed with joint considerations on fairness, resource balancing, resource reuse, and multi-user diversity.
Design of wireless sensor network for multi-point surveillance of a moving target based on the relationship between tracking probability and sensor density
Authors: Kazuya Tsukamoto, Hirofumi Ueda, Hitomi Tamura, Kenji Kawahara, Yuji Oie
Venue: Proceedings of the 6th IEEE Conference on Consumer Communications and Networking Conference (2009)

In this paper, we focus on the problem of tracking a moving target in a wireless sensor network (WSN) in which the capability of each sensor is relatively limited in order to construct large-scale WSNs at a reasonable price. In our prior study, we proposed a simple multi-point surveillance scheme for a moving target in a WSN and demonstrated that the scheme achieved high tracking probability with low power consumption. However, we have not suggested guidelines for designing the WSN to completely satisfy the wide range of user requirements. Therefore, in this study, we examine the relationship between tracking probability and sensor density through simulations, and then derive an approximate expression representing the relationship. As a result, we show guidelines for sensor density, tracking probability, and the number of monitoring sensors that satisfy a variety of application demands.
Impulsive noise cancellation based on zero insertion technique for high bit rate powerline communication system
Authors: F. Rouissi, F. Tlili, V. Degardin, A. Ghazel, M. Lienard
Venue: Proceedings of the 16th international conference on Telecommunications (2009)

This paper presents a technique for maintaining good broadband transmission quality in the face of impulsive noise in OFDM- PLC systems. The proposed technique is based on adding one zero between two signal samples in order to estimate the noise power in every transmitted signal sample. Simulation results of complete PLC system highlight good improvement in BER and correction ability performances for low power noise pulses independently from its types and durations.
mDHT: multicast-augmented DHT architecture for high availability and immunity to churn
Authors: Jae Woo Lee, Henning Schulzrinne, Wolfgang Kellerer, Zoran Despotovic
Venue: Proceedings of the 6th IEEE Conference on Consumer Communications and Networking Conference (2009)

This paper presents mDHT, a novel architectural enhancement to DHT using multicast service discovery. In mDHT, a group of host computers in a subnet participate in a DHT overlay as a single node. A query is routed from subnet to subnet until it reaches the final destination subnet, where it is resolved among the hosts using link-local multicast. Under a reasonable deployment assumption, mDHT offers many benefits over standard DHTs, such as locality, easy bootstrapping, high availability, and near imperviousness to node churn.
SIP-based protocol for P2P large-scale multiparty VoIP (MVoIP) conference support
Authors: Wajdi Elleuch, Alain C. Houle
Venue: Proceedings of the 6th IEEE Conference on Consumer Communications and Networking Conference (2009)

Even if both traditional centralized and decentralized models can support small conferences, their deployment for large number of participants is less obvious. In fact, while server-based centralized conference facilitates control and administration operations, supporting centralized media processing in large scale conference causes system overhead on the mixer. On the other hand, decentralized solutions that use multi end-system media processors will introduce an overhead to control conference floors and users membership. Our solution introduces a new model that enable multi-host media process support while the conference control and management is kept simplified and centralized around the administrator. To do that, we build two different meshed networks to enable both voice audio distribution between participants and general conference control. Our conference system includes different components that enable conference creation/destruction, user addition/removal, media assignment and speech floor control. We introduce an abstract protocol message that implements membership operations. We also discuss the implementation of system components and we detail their mapping to SIP.
Concavity of mutual information rate for input-restricted finite-state memoryless channels at high SNR
Authors: Guangyue Han, Brian Marcus
Venue: Proceedings of the 2009 IEEE international conference on Symposium on Information Theory - Volume 3 (2009)

We consider a finite-state memoryless channel with i.i.d. channel state and the input Markov process supported on a mixing finite-type constraint. We discuss the asymptotic behavior of entropy rate of the output hidden Markov chain and deduce that the mutual information rate of such a channel is concave with respect to the parameters of the input Markov processes at high signal-to-noise ratio. In principle, the concavity result enables good numerical approximation of the maximum mutual information rate and capacity of such a channel.
A class of transformations that polarize binary-input memoryless channels
Authors: Satish Babu Korada, Eren Sasoǧlu
Venue: Proceedings of the 2009 IEEE international conference on Symposium on Information Theory - Volume 3 (2009)

A generalization of Arikan's polar code construction using transformations of the form G⊗n where G is an l × l matrix is considered. Necessary and sufficient conditions are given for these transformations to ensure channel polarization. It is shown that a large class of such transformations polarize binary-input memoryless channels.