2007-12-19: Master Thesis Presentation

Publicerad: 2007-12-17

On Wednesday December 19, 10.15 in E:2311, Nils Mattisson will present his Master's thesis "Energy Efficiency of General-Purpose Computations on Graphics Hardware".

1st Call for Papers to RVK08

Publicerad: 2007-11-12

The Swedish National Committee of URSI (Svenska Nationalkommittén för RadioVetenskap, SNRV) and the International Centre for Mathematical Modelling in Physics, Engineering and Cognitive Sciences at Växjö University, invite all interested to the co-organized conferences RVK08 and MMWP08 to be held in Växjö, Sweden starting June 9th 2008.

RVK08 is the twentieth Nordic Conference on Radio Science and Communications (RadioVetenskap och Kommunikation). The scope of the conference is very broad and covers everything between antenna and earth in the field of radio science and communications.

Deadline for submission of abstracts is the 15th of December 2007.

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1st Call for Papers to MMWP08

Publicerad: 2007-11-12

The International Centre for Mathematical Modelling in Physics, Engineering and Cognitive Sciences at Växjö University and the Swedish National Committee of URSI (Svenska Nationalkommittén för RadioVetenskap, SNRV), invite all interested to the co-organized conferences MMWP08 and RVK08 to be held in Växjö, Sweden starting June 9th 2008.

MMWP08 is the third International Conference on Mathematical Modelling of Wave Phenomena. The MMWP conferences present unifying ideas of wave modelling from different disciplines treating fundamentals as well as applications.

Deadline for abstracts is 15th of December 2007

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Disputation 2007-12-14

Publicerad: 2007-10-05

Anders Nilsson Plymoth försvarar sin avhandling vid en publik disputation den 14/12 2007 klockan 10:15 i E:1406. Avhandlingens titel är "Wireless Multi Hop Access Networks and Protocols". Fakultetsopponent är Professor Khaldoun Al Agha.

Abstract:
=========
As more and more applications and services in our society now depend on the Internet, it is important that dynamically deployed wireless multi hop networks are able to gain access to the Internet and other infrastructure networks and services. This thesis proposes and evaluates solutions for providing multi hop Internet Access. It investigates how ad hoc networks can be combined with wireless and mesh networks in order to create wireless multi hop access networks. When several access points to the Internet are available, and the mobile node roams to a new access point, the node has to make a decision when and how to change its point of attachment. The thesis describes how to consider the rapid fluctuations of the wireless medium, how to handle the fact that other nodes on the path to the access point are also mobile which results in frequent link and route breaks, and the impact the change of attachment has on already existing connections. Medium access and routing protocols have been developed that consider both the long term and the short term variations of a mobile wireless network. The long term variations consider the fact that as nodes are mobile, links will frequently break and new links appear and thus the network topology map is constantly redrawn. The short term variations consider the rapid fluctuations of the wireless channel caused by mobility and multi path propagation deviations. In order to achieve diversity forwarding, protocols are presented which consider the network topology and the state of the wireless channel when decisions about forwarding need to be made. The medium access protocols are able to perform multi dimensional fast link adaptation on a per packet level with forwarding considerations. This i ncludes power, rate, code and channel adaptation. This will enable the type of performance improvements that are of significant importance for the success of multi hop wireless networks.

Disputation 2007-12-14

Publicerad: 2007-10-11

Håkan Englund försvarar sin avhandling vid en publik disputation den 14/12 2007 klockan 13:15 i E:1406. Avhandlingens titel är "Some Results on Distinguishing Attacks on Stream Ciphers".

Abstract:
=========

Stream ciphers are cryptographic primitives that are used to ensure the privacy of a message that is sent over a digital communication channel. In this thesis we will present new cryptanalytic results for several stream ciphers.

The thesis provides a general introduction to cryptology, explains the basic concepts, gives an overview of various cryptographic primitives and discusses a number of different attack models.

The first new attack given is a linear correlation attack in the form of a distinguishing attack. In this attack a specific class of weak feedback polynomials for LFSRs is identified. If the feedback polynomial is of a particular form the attack will be efficient.

Two new distinguishing attacks are given on classical stream cipher constructions, namely the filter generator and the irregularly clocked filter generator. It is also demonstrated how these attacks can be applied to modern constructions. A key recovery attack is described for LILI-128 and a distinguishing attack for LILI-II is given.

The European network of excellence, called eSTREAM, is an effort to find new efficient and secure stream ciphers. We analyze a number of the eSTREAM candidates. Firstly, distinguishing attacks are described for the candidate Dragon and a family of candidates called Pomaranch. Secondly, we describe resynchronization attacks on eSTREAM candidates. A general square root resynchronization attack which can be used to recover parts of a message is given. The attack is demonstrated on the candidates LEX and Pomaranch. A chosen IV distinguishing attack is then presented which can be used to evaluate the initialization procedure of stream ciphers. The technique is demonstrated on four candidates: Grain, Trivium, Decim and LEX.

2007-12-13: PhD students in HSWC seminar

Publicerad: 2007-12-04

It’s time for a new seminar in the series where the PhD students in HSWC present their research:

Where? - E:2311 (“orangeriet” on the 2:nd floor)
When? - Thursday 13th December at 15:15.

Speaker: Dzevdan Kapetanovic, PhD student in the Information Theory Group.

Title: “Capacity of Faster than Nyquist Signaling compared with ordinary Nyquist signaling capacity”

Abstract:
In this work, which is planned for submission to ISIT 2008, we investigate capacity of Faster than Nyquist Signaling (FTN) and compare to ordinary Nyquist signaling, when having a simple one transmitter one receiver system with Additive White Gaussian Noise (AWGN). The capacity that is studied comes from using a Gaussian distributed signaling alphabet at the transmitter and is dependent on the pulse spectrum and the Signal to Noise Ratio (SNR) of the channel. In the work, we derive a number of conditions for pulses to fulfill in order to have increasing FTN capacity with higher signaling rate, and also to always have larger FTN capacity than Nyquist capacity.

The results are then applied to some commonly occurring pulse spectra, among them the well known root RC pulse. Its capacity is shown to increase as the root RC signaling becomes “faster”.

Master Thesis Presentation 2007-12-12

Publicerad: 2007-12-11

On Wednesday December 12, 10.15 in E:2311, Sudhir Rao Rupanagudi and Vinita Rupanagudi will present their Master's thesis "Implementation of the Trellis Decoder".

Abstract
========
This thesis presents the hardware implementation of a trellis decoder. Various methods of reducing the computational complexity of the decoder have been discussed. A new methodology, to reduce the mathematical complexity of obtaining the branch metrics associated with the trellis decoder has been incorporated to obtain an area and a power effcient design. Analysis of chip area occupied by the design along with the power analysis has been shown. The results obtained from performance analysis of the trellis decoder has also been reported in the thesis. The decoder was realised in VHDL-RTL and was synthesized for an ASIC implementation. Synthesis shows that an area reduction of 60% can be achieved. Furthermore, power estimations show that a maximum reduction of 42% in power can be obtained.

Disputation 2007-12-07

Publicerad: 2007-10-19

Peter Sjöblom försvarar sin avhandling vid en offentlig disputation fredagen den 7e december 2007 klockan 13:15 i E:1406. Fakultetsopponent är Torben Larsen, Aalborg Universitit.

ABSTRACT

Mobile phones becomes smaller but yet with more advanced functions for every new generation. This paradox is possible as increased integration of digital building blocks and reduced transistor size free space for new functions. Unfortunately, not all components are easily integrated or scaled, such as the antenna, as its performance is dependent on the size. Shrinking mobile phone size results in increased impedance mismatch as the available antenna volume and the length of the ground plane are reduced. As a consequence, the performance of the whole mobile phone transceiver is degraded, since the noise increases and output power decreases with increased mismatch.

A study of reconfigurable matching networks and their improvement of receiver and transmitter performance with mismatched antennas has been performed. In the general introduction, the matching network is introduced as an Impedance Tuning Unit (ITU) and the behaviour from the fundamental building blocks to system aspects are studied. Also interaction with other building blocks in the receiver chain, such as low noise amplifier, mixer, and filter are investigated. It is shown that by introducing an ITU, which has the ability to change its matching configuration, noise performance and power transfer are improved. It is also shown that it is possible to realize an ITU for receivers in CMOS.

Paper I and II examines antenna design and aspects such as shielding and coupling. Paper III is a parameter study of a switched capacitor. In paper IV to VI ITU topologies are simulated and measured for 0.35 and 0.13 um and 2.4 to 2.5 GHz and 470 to 702 MHz. The results are presented together with system aspects relevant for receivers.

2007-12-07: Master Thesis Presentation

Publicerad: 2007-12-06

Krittanon Chalermsuk and Robert Spaanenburg will present their Master thesis titled: “Flexible Length Fast Fourier Transform”.
Time: Friday 7 december at 11:00 hours
Place: E:3139

Abstract:
=========
The Discreet Fourier Transform (DFT) is the most straightforward mathematical tool for determining the frequency content of a time-domain sequence, at the same time, it is highly inefficient. As the transform length increases the amount of arithmetic involved becomes excessive. The Fast Fourier Transform (FFT) is one of the today’s most important tools in digital signal processing, as it enables efficient transformation between the time and frequency domain. Existing and emerging communication applications are based on coded orthogonal frequency domain modulation (COFDM) with various numbers of sub-carriers. Within these systems, the FFT is the most vital component enabling demodulation of data from orthogonal carriers.
This thesis addresses the pre-existing solutions and the voids being filled by this work. It systematically presents the derivation for a highly flexible Fast Fourier Transform IP core at three different levels, namely the algorithmic, the arithmetic, and the structural level. Various areas of possible optimization, such as performance, power efficiency, and area are presented with matrices to verify the results.

Wireless Seminar 2007-12-06

Publicerad: 2007-12-03

NEXT WIRELESS CENTER SEMINAR!
Thursday, 6 dec., kl. 15.15 in E:2311 (Orangeriet)
"Physical bounds in scattering and antenna problems"
Gerhard Kristensson
Professor, EIT Department

Exjobbspresentation "Investigation of MIMO Performance for 2x2 and 4x4 Antenna System"

Publicerad: 2007-11-21

On Friday Nov 23, 9.15 in E:2349 Mujtaba Sakhi will present his Master's thesis "Investigation of MIMO Performance for 2x2 and 4x4 Antenna System". The work has been performed in cooperation with Perlos and deals with a joint analysis of antenna and channel influence on MIMO performance for handsets.

Abstract
========
Mobile phones are no longer used just as a telephone. In addition to the standard voice function, current mobile phones support many other services, such as text messaging, sending and receiving photos and videos and accessing Internet. Some of these services require high data transmission rate. Multiple Input and Multiple Output (MIMO) is a promising technique that can increase the capacity of a wireless channel i.e. increase the transmission rate without increasing the bandwidth or the transmitting power. MIMO is based on having multiple transmit and multiple receive antennas. In this thesis the MIMO performance is studied by simulations and measurements.

The main part of the project was to study the MIMO performance by combining simulated data of a 3GPP spatial channel model with data from measured antenna far-field. From the simulated and the measured data, the channel matrix and the theoretical channel capacity was calculated and analyzed.

To verify the result of the simulation, a channel sounder was used in an indoor environment to measure real channels both in time and frequency. Two MIMO antenna terminals each with four antenna elements were build and used in the measurements as a mobile station. The base station was a 32 elements cylindrical antenna array. The channel capacity and the correlation between antenna elements were calculated.

A program was written in MATLAB that handles the simulated channel parameters and the measured antenna far field data. The program calculates the MIMO channel matrix by combining the measured antenna far field with simulated channel parameters for the 3GPP spatial channel model. The program calculates and shows graphically interesting quantities such as channel capacity, correlation between antenna elements, antenna efficiency and antenna gain.

NEXT WIRELESS CENTER SEMINAR 22 Nov.

Publicerad: 2007-11-12

At the Next Wireless Center Seminar Andreas Molisch Professor, EIT Department, will lecture on "Mimo Propagation Channels and Their Impact on System Design".

Time: Thursday, 22 Nov., at 15.15
Place: E:2311 (Orangeriet)

Abstract:
Wireless multiple-input - multiple-output (MIMO) systems, those that have multiple antenna elements at both link ends, greatly enhance the robustness and spectral efficiency of wireless communication. While most of the literature has concentrated on signal processing and space-time coding for MIMO, the fundamental performance limits are determined by the propagation channel and the way it is "excited" and "sampled" by the transmit and receive antenna arrays. We first give an overview of array design, in particular, the question of how close antennas can be spaced. Then we describe typical propagation channels and how they affect system capacity; we also consider ways to describe the interaction between antennas and channels. Throughout, the theme will be how antenna and channel properties affect system capacity, diversity, and other performance parameters.

2007-11-22: Seminarium av Prof Jacques Stern

Publicerad: 2007-11-14

Prof Jacques Stern ger ett seminarium med titeln "Cryptography in Financial Transactions: Current Practice and Future Directions" den 22/11 kl 13.15 i E:2311.

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MIMO seminars 19th November 2007

Publicerad: 2007-11-12

On Monday, 19th Nov 2007, we are hosting a visit by two researchers from NTT Labs, Japan. They will present two seminars on interesting MIMO topics, starting at 10.15am.

Time: 10.15-11.15 Location: Seminar room E:2311 (Orangeriet)

Seminar #1:
===========
Cooperative Interference Cancellation for Multi-user MIMO transmission
Presenter: Dr Kentaro Nishimori
Abstract:
This presentation proposes a novel interference cancellation method that utilizes relay stations in multi-user transmission systems. Unlike conventional relay transmission methods, the relay stations are used to decode the interference and transfer their pertinent information to mobile stations. The proposed method exploits the training signals and frame format of the interference when each user transmits signal with different timing. Even if external interference simultaneously arrives at the mobile stations during the transmission period from an access point to the mobile stations, the mobile stations employing the proposed method can effectively cancel the external interference because the relay station transfers the information related to the interference to the mobile stations. Moreover, the computer simulation was carried out to evaluate the effectiveness of the proposed method. We show that the proposed method improves the achievable transmission rate compared to that for multi-user transmission with interference cancellation based on the zero forcing algorithm when the number of antennas at the mobile station is increased.

Seminar #2:
===========
MIMO Channel Capacity Maximization of Bidirectional Yagi-Uda Array in an Actual Indoor Environment
Presenter: Dr Naoki Honma
Abstract:
At the MIMO (Multi-Input Multi-Output) terminal, the number of the transmitter/receiver and the size for antenna should be small enough in order not to affect the size of the terminal. When the further data-rate enhancement is required even for such small MIMO terminals, the antenna, which can offer a high channel capacity even with small configuration, is necessary. We have proposed a bidirectional Yagi-Uda array, which can achieve the radiation properties suitable for MIMO. In this presentation, the experimental result on the radiation pattern optimization of bidirectional Yagi-Uda antenna is reported. Based on the measurement, it is clarified that the 39 % channel capacity enhancement is obtained when the electrical length of the director elements is properly given.

Speakers' biographies
=====================
Kentaro Nishimori: Research Engineer, Wireless Systems Innovation Laboratory, NTT Network Innovation Laboratories. He received the B.E., M.E. and Dr. Eng. degrees in electrical and computer engineering form Nagoya Institute of Technology, Nagoya, Japan in 1994, 1996 and 2002, respectively. In 1996, he joined the NTT Wireless Systems Laboratories, Nippon Telegraph and Telephone Corporation (NTT), in Japan. He is research engineer on NTT Network Innovation Laboratories. He was a visiting researcher at the Center for Teleinfrastructure (CTIF), Aalborg University, Aalborg, Denmark in 2006. He received the Young Engineers Award from the IEICE of Japan in 2001 and Young Engineer Award from IEEE AP-S Japan Chapter in 2001. His current research interest is Multi-user MIMO systems and cognitive radio systems. He is a member of IEICE and IEEE.

Naoki Honma: Research Engineer, Wireless Systems Innovation Laboratory, NTT Network Innovation Laboratories. He received the B.E., M.E., and Ph.D degrees in electrical engineering from Tohoku University, Miyagi, in 1996, 1998, and 2005, respectively. In 1998, he joined NTT Radio Communication Systems Laboratories. His current research interests include planar antennas for high-speed wireless communication systems. He is a member of the Institute of Electronics, Information and Communication Engineers (IEICE) of Japan and IEEE. He received the 2003 Young Engineers Award from IEICE, the 2003 APMC Best Paper Award, and the 2006 IEICE Communications Society Best Paper Award.

2007-11-16: Exjobbspresentation "Front-End for Ultra Wide-Band Wireless Receivers in 90nm CMOS"

Publicerad: 2007-11-14

Waqas Ahmad presents his master's thesis titled "Front-End for Ultra Wide-Band Wireless Receivers in 90nm CMOS".
Location: Orangeriet (E:2311), E-huset, LTH
Day: Friday (16/11)
Time: 15.15

Abstract:
In the thesis Waqas has investigated different LNA+Mixer topologies suitable for wideband operation. Designing an LNA for narrowband operation can be hard due to requirements on input matching, gain, noise figure, linearity etc. Keeping the requirements and increasing the bandwidth to 7.5GHz makes the design even more difficult!

Examensarbetspresentation 6/11

Publicerad: 2007-10-31

Tisdag 6/11 klockan 10.15 presenterar Johan Öberg och Per Wallmark sitt examensarbete "Faciliating User Data Synchronization in OMSI - Using the OMA-DS protocol" i E:5119.

Matematik och elektrovetenskap – temadag för gymnasielärare och gymnasister

Publicerad: 2007-10-19

Gerhard Kristensson, EIT, är en av arrangörerna för temadag för gymnasielärare och gymnasister den 8e november. Syftet med dagen är att bidraga till att vända den nedåtgående trenden av intresse för teknik, naturvetenskap och matematik. Temadagen är ett samarbete mellan Nationalkommittén för matematik, Nationalkommittén för radiovetenskap och Kommittén för vetenskap och skola under KVA.

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Disputation 1/11

Publicerad: 2007-10-01

Koraljka Golub försvarar sin avhandling vid en offentlig disputation den 1/11 klockan 10.15 i E:1406. Avhandlingen har titeln "Automated Subject Classification of Textual Documents in the Context of Web-Based Hierarchical Browsing ". Fakultetsopponent är Prof. Douglas Tudhope, Glamorgan University.

Abstract:

With the exponential growth of the World Wide Web, automated subject classification has become a major research issue. Organizing web pages into a hierarchical structure for subject browsing has been gaining more recognition as an important tool in information-seeking processes.

The most frequent approach to automated classification is machine learning. It, however, requires training documents and performs well on new documents only if they are similar enough to the former. In the thesis, a string-matching algorithm based on a controlled vocabulary was explored. It does not require training documents, but instead reuses the intellectual work invested into creating the controlled vocabulary. Terms from the Engineering Information thesaurus and classification scheme were matched against text of documents to be classified. Plain string-matching was enhanced in several ways, including term weighting with cut-offs, exclusion of certain terms, and enrichment of the controlled vocabulary with automatically extracted terms. The final results were comparable to those of state-of-the-art machine-learning algorithms, especially for particular classes. Concerning web pages, it was indicated that all the structural information and metadata available in web pages should be used in order to achieve the best automated classification results; however, the exact way of combining them proved not to be very important.

In the context of browsing, the biggest difference between three approaches to automated classification (machine learning, information retrieval, library science) is whether they use controlled vocabularies. It has been claimed that well-structured, high-quality classification schemes, such as those used predominantly in library science approaches, could serve as good browsing structures. In the thesis it was shown that Dewey Decimal Classification and Engineering Information classification scheme are suitable for the task. Moreover, a log analysis of a large web-based service using Dewey Decimal Classification demonstrated that browsing is used to a much larger degree than searching.

The final conclusion is that an appropriate controlled vocabulary, with a large number of entry vocabulary designating classes, could be utilised in automated classification. If the same controlled vocabulary has an appropriate hierarchical structure, it could at the same time provide a good browsing structure to the automatically classified collection of documents.

Elevkonferens InfoCom2007 26/10

Publicerad: 2007-10-01

Kursen Kommunikationssystem avslutas med en elevkonferens 26/10 9-16. Gymnasieklasser är välkomna att deltaga i konferensen som åhörare. Kontakta Jens Andersson, EIT, för mer information.

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HSWC seminar: What is a Hertz-Second?

Publicerad: 2007-10-15

John Andersson will give a seminar with this title in Orangeriet, E:2311, Thursday, 25 oct., at 15.15.

ABSTRACT

What is a Hz-s? What is a bit/Hz-s? Or is it bit/Hz/s? These units have puzzled many of us for years. Is the Hz-s dimensionless? If not, what are its dimensions? We look into this puzzle and argue the point of view that much of communication theory – including communication cost, probability of error, Shannon capacity, and even communication with space aliens – is built in the first instance upon the Hz-s. We give the case, with some help from outer space, that everyday measures such as bits/s in fact derive from the Hz-s measure.

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Konferens EMB07 i Lund 18-19/10 2007

Publicerad: 2007-06-18

EIT är värd för EMB07, en konferens om datorbaserade metoder för elektromagnetism. Konferensen hålls 18-19/10 i Palaestra et Odeum i Lundagård i centrala Lund. Utförlig information om konferensen finns via länken nedan.

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NETWORK CODING AND RELATED TOPICS

Publicerad: 2007-09-24

Dr Gerhard Kramer will give a series of seven seminars. The seminars are entitled
1. Networks and Flows (Thursday Sept. 27, 15.15-17.00. E3139)
2. Multicast and Network Coding (Tuesday Oct. 2, 15.15-17.00. E3139)
3. A Linear Network Coding Algorithm (Thursday Oct. 4, 15.15-17.00. E3139
4. Convolutional and Random Codes (Monday Oct. 15, 15.15-17.00. E3139)
5. Broadcast Models and Cut Bounds (Wednesday Oct. 17, 15.15-17.00. E3139)
6. Deterministic Relay Networks (Monday Oct. 29, 15.15-17.00. E3139)
7. Two-way Relay Networks (Wednesday Oct. 31, 15.15-17.00. E3139)

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Disputation 2007-10-12

Publicerad: 2007-10-05

Maja Loncar försvarar sin avhandling vid en offentlig disputation den 12/10 klockan 10.15 i E:1406. Avhandlingen har titeln "Taming of the BEAST". Fakultetsopponent är Prof. Daniel J. Costello Jr., University of Notre Dame, USA.

Abstract:

Modern communication systems are designed to enable reliable and fast information transfer. Therefore, efficient channel coding and decoding strategies are needed, which guarantee sufficiently low probability of erroneous reception with affordable receiver complexity. For many channel codes, optimal decoding with traditional methods is prohibitively complex. The challenge therefore lies in designing reduced-complexity decoding algorithms that achieve optimal or near-optimal performance. This thesis is devoted to one such algorithm - Bidirectional Efficient Algorithm for Searching code Trees (BEAST).

The taming of the BEAST is laid out in several steps. After an introduction to coding, trellis and tree representations of codes are reviewed as prerequisites for understanding the BEAST. Maximum-likelihood decoding using BEAST, and its generalization to list decoding are presented first. An investigation of geometrical aspects of list decoding has resulted in new bounds on the list error probability. It is shown that the performance of a list decoder is determined by the worst-case list configuration, which yields the minimum list distance of a code.

A commonly used approach for achieving a good performance/complexity tradeoff is to use concatenated codes with iterative decoding, where decoders of constituent codes, employed as separate entities, iteratively exchange information on decoded symbols. In such a setup, the decoders provide soft symbol reliabilities in the form of a posteriori probabilities (APPs). It is shown that accurate APP approximations can be obtained from a short list of the most probable codewords found by BEAST. This decoding method is referred to as BEAST-APP decoding. Product codes belong to the class of iteratively decodable codes and the BEAST-APP decoder is used for decoding of constituent codes, yielding good performance with low complexity. Finally, BEAST is applied as soft-input soft-output detector for transmission over intersymbol interference channels. Its advantages and limitations in comparison to existing decoding methods are discussed.

Seminar "Beyond Sequential Decoding"

Publicerad: 2007-10-11

Professor Daniel J. Costello, Univ of Notre dame, Indiana, will give a seminar Friday 12/10. The title is: "Beyond Sequential Decoding: Heuristic Tree Search Decoding of Convolutional Codes".
Place: E3139
Time: 15.15-16.00

HSWC Seminar 2007-10-11

Publicerad: 2007-10-05

Erik Lind, Solid State Physics, Lund University, will give a speach titled "mm-Wave InP Double Heterostructure Bipolar Transistors" in Orangeriet, E:2311, Thursday, 11 oct., at 15.15.

ABSTRACT - Erik will present results obtained at UC Santa Barbara, showing his record outcomes for f_t and f_max above 500 GHz with HBTs. He will discuss some basic transistor physics, HBT scaling laws and give some insight into the feasibility of TeraHz transistors.

Professor Bram Nauta, University of Twente, visits EIT

Publicerad: 2007-10-01

Professor Bram Nauta, University of Twente, Editor-in-Chief for the IEEE Journal of Solid-State Circuits, will visit us and give two talks, on Thursday, October 4 at 10.15 in “Orangeriet” – E:2311.
Titles:
* An Inductorless Wideband Balun-LNA in 65nm CMOS with balanced output (ESSCIRC 2007)
* A 1.35 GS/s, 10b, 175 mW Time-Interleaved AD Converter in 0.13 µm CMOS(VLSI2007)

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Disputation 2007-09-28

Publicerad: 2007-06-29

Fredrik Kristensen försvarar sin doktorsavhandling "Design and Implementation of Embedded Video Surveillance Hardware" vid en offentlig disputation den 28/9 2007 klockan 10.15 i E:1406. Fakultetsopponent är Dr Henrik Turbell.

HSWC-seminarium (PhD) tisdag 25/10 15.15

Publicerad: 2007-09-20

On Tuesday 25/10 at 15.15 in E:3139 we will have the next HSWC (PhD) seminar. Title “UWB under coexistence constraints”. Speaker is Kasra Haghighi, PhD student at the Department of Signals and Systems, Chalmers.

Abstract:
A major milestone in UWB deployment was the decision of FCC for using 3.1 to 10.6 GHz with a power spectral density of -41.3dBm/MHz. But in other countries the regulations are a bit different from US. In Japan and EU there is a need for Detect and Avoid scheme for legacy systems. In this presentation some research ideas for using MIMO for increasing spectral efficiency of UWB and also DAA for UWB will be discussed. These methods are based on cooperative cognitive radio and spatial reuse. The goal is to avoid interference with legacy systems and enabling more co-located uncoordinated UWB pico-nets.

Disputation 2007-09-24

Publicerad: 2007-08-21

Fredrik Rusek försvarar sin avhandling "Partial Response and faster-than-Nyquist Signaling" vid en offentlig disputation måndagen 24/9 2007 kl 10:15 i E-huset, sal E:1406. Fakultetsopponent är Professor Joachim Hagenauer, Technical University of Munich (TUM). Professor John B. Anderson är handledare.

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Special EIT Seminar: "Information Theory and Genetics"

Publicerad: 2007-09-21

Prof. Joachim Hagenauer, Technical University of Munich, will present an extra seminar titled "Information Theory and Genetics" to the department.
Room: E:3114C.
Time: Monday, 24 sept., 16.00 (prick)
All welcome!

Exjobbspresentation "Trådlösa sensorer för 12-avlednings EKG"

Publicerad: 2007-09-11

Francois Ghilain och Ulrika Schönström redovisar sitt examensarbete "Trådlösa sensorer för 12-avlednings EKG" fredagen den 14/9 kl. 13.15-14.00 i Orangeriet på inst. för elektro- och informationsteknik (vån 2).

Disputation 2007-09-13

Publicerad: 2007-08-21

Martin Hell försvarar sin avhandling "On the Design and Analysis of Stream Ciphers" vid en offentlig disputation torsdag 13/9 2007 kl 13:15 i E-huset, sal E:1406. Fakultetsopponent är Dr. Matthew J.B. Robshaw och Thomas Johansson är handledare.

Presentation by Dr. Giuliana Carello Optimization problems in wired and wireless networks

Publicerad: 2007-09-07

On September 11 at 15.15-16.00, Dr. Giuliana Carello will give a presentation in E:5119 about the activities at the Department of Electronics and Informations at Politecnico di Milano. After a brief introduction presenting the Operations Research Group of DEI of Politecnico di Milano and its main research activities, two papers on ongoing work will be presented:

- Resource Allocation in Wireless Mesh Networks - Multi-layer MPLS Network Design with Statistical Multiplexing

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CCCD Workshop 2007 6-7/9

Publicerad: 2007-08-21

10 Years Success in Wireless SoC – A Solid Foundation for the Future
CCCD Workshop 2007 hålls den 6-7/9 på Grand Hotel i Lund. På denna årliga workshop presenteras akademiska insatser, och den är därför ett utmärkt tillfälle för representanter från både akademi och industri att mötas utbyta idéer och erfarenheter.

Mer information, Second Announcement och Preliminary Program via länken nedan.

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Doktorandkurs i UWB-kommunikation 27/8-15/10

Publicerad: 2007-06-19

Vi kommer att ha en doktorandkurs i UWB-kommunikation 27/8-15/10, med introdkuktionsträff 27/8 13.15 i E2311. Kursen vänder sig till studenter med kommunikationsbakrund som vill lära sig mer om UWB-system. Anmälan sker snarast till Fredrik Tufvesson, som också kan ge mer information.

Starting August 27th 13.15 in E:2311, there will be a PhD course in ultrawideband communication. To estimate how many participants there will be, I would like you to express your interest in participating by June 28th at the latest to me in an email. If you have a strong opinion about the time schedule, please let me know as well. Feel free to distribute this invitation to anybody you think might be interested.

We will have weekly meetings (Mondays 13-15 if this works out for the participants, but I am open to other suggestions) with seminars given by the participating students. I will be coordinator for the course and give the first lecture. As examination there will be weekly assignments. It will be possible to follow the course remotely e.g. for HSWC students, except for the (mandatory) lecture given in Lund. The course will end mid October (Oct 15th) and will be worth 4-5 credits (6-7.5 ECTS/hp).

We will probably use Understanding Ultra Wide Band Radio Fundamentals (Prentice Hall Communications Engineering and Emerging Technologies Series) by Di Benedetto & Giancola, but there are are some other books I want to look at before making a definitive decision.

Licentiat-seminarium 3/9

Publicerad: 2007-08-10

Christian Sohl presenterar sin licentiat-uppsats med titeln "Dispersion Relations for Extinction of Acoustic and Electromagnetic Waves" måndag 3/9 kl. 10.15 i E:3139. Opponent är Prof. Ehud Heyman, Tel Aviv University, Israel.

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Exjobbspresentation 31/8

Publicerad: 2007-08-17

Peter von Lochow och Sladan Trajkovic presenterar sitt examensarbete fredag 31/8 13.30 i E:5119. Arbetet har titeln "Reusable Cardgame Engine for Windows Mobile Platfom".

HSWC seminar on UWB 2007-08-30

Publicerad: 2007-08-25

You are hereby invited to the second seminar in a new series, where the PhD students in the High Speed Wireless Communication (HSWC) centre present their research. This time there will be two speakers, both in the area of Ultra Wideband (UWB) communication.

Where? - E:2311 (“orangeriet” on the 2:nd floor)
When? - Thursday 30th August at 10:15.

First Speaker: Mats Ärlelid, PhD student in the Circuit Design Group.
Title: “Nanoelectronic Impulse Ultra Wideband Radio”
Abstract:
Implementation of impulse UWB radio at high frequencies (up to 60 GHz) will be explored. The technology is based on a gated resonant tunnel diode placed in an oscillator circuit, where the gate is used to pulse the oscillator. The goal is to achieve bit rates above 3-4 Gbit/s. The project addresses questions related to device and circuit technologies, the antenna interface, and the signal transmission in the device.

Second Speaker: Telmo Santos, PhD student in the Radio Systems Group
Title: “UWB channel characterization” (preliminary)

29/8: IEEE Distinguished Lecture om UWB

Publicerad: 2007-08-09

CommTech-portalen inbjuder till en IEEE-föreläsning om UWB. Föreläsare är IEEE Distiguished Lecturer Dr. Moe Win. Föreläsningens titel är "New Directions in Ultrawide Bandwidth Communications and Networks". För detaljer följ länken nedan.

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CCCD Workshop 2007 6-7/9. Registering senast 2007 20/8.

Publicerad: 2007-06-18

10 Years Success in Wireless SoC – A Solid Foundation for the Future
CCCD Workshop 2007 hålls den 6-7/9 på Grand Hotel i Lund. På denna årliga workshop presenteras akademiska insatser, och den är därför ett utmärkt tillfälle för representanter från både akademi och industri att mötas utbyta idéer och erfarenheter.

Mer information, Second Announcement och Preliminary Program via länken nedan.

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20/8 Presentation av examensarbete för kandidatexamen

Publicerad: 2007-08-15

Fredrik Nedmark har under våren 2007 gjort ett 10p kandidatexamensarbete inom fysikprogrammet på naturvetenskaplig fakultet. Han har handletts vid institutionen för elektro- och informationsteknik, och studerat möjligheterna för att detektera Schumannresonansen, dvs lägsta egensvängningen i hålrummet mellan jordytan och jonosfären (kring 8Hz). Presentationen sker måndag 20/8 kl 15.15 i E:2311.

Exjobbspresentation "Home Page Detection"

Publicerad: 2007-08-13

Olof Friman presenterar (på svenska) sitt exjobb 'Home Page Detection' tisdag 14/8 10.15 i E:3139.

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Exjobbspresentation 29/6

Publicerad: 2007-06-26

Christer Wibom och Phat Tran presenterar sitt examensarbete "Simulation and Analysis of a Wireless Ad-hoc Network using DYMO" på fredag 29/6 10.00 i E:5119.

Abstract
In this master’s thesis project we simulated an ad-hoc network with 90 mobile nodes using ns-2 and nodes will move randomly and dynamically. A total of twenty pairs of simulations with different movement patterns but with the same call pattern were executed. The aim of this project was to develop an energy aware routing algorithm (E-DYMO) from DYMO. DYMO is a reactive routing protocol and is based on the routing protocols AODV and DSR. E-DYMO chooses the best route based on DYMO criteria and an additional condition based on the remaining energy and hop count.

A comparison between E-DYMO and DYMO was made to see the effect of the modification that was made. Some of the metrics that were compared was hop count and remaining energy in the network. One finding was that E-DYMO transmits more route requests and that communications could switch path during a connection. During the project we discovered that there are routing loops in the network for data packets.

Exjobbspresentation 29/6

Publicerad: 2007-06-27

Friday 29/6 at 15.15 in E:2311, will Rafael Inda Cervino present his master thesis "Low complexity real-time object localization in a surveillance application"

Abstract
Surveillance systems are widely used in many different fields nowadays. They are present everywhere, even small businesses install them to improve security. Those systems evolve to better resolutions and services at a lower cost and this makes the designers to look for optimized models which offer high functionality with low silicon area and memory requirements. A surveillance system starts with the sensor that takes the information from the real world and ends on a screen or recorder. There are many blocks in between and different configurations and solutions are possible. This thesis is a combination between research and development of an original project at the department of Electrical and Information technology. The goal is to implement and verify a module that tracks objects using the concept of image projections.

Best regards,
Fredrik Kristensen

Exjobbspresentation 29/6

Publicerad: 2007-06-27

Pere Bartolí Simó presenterar sin exjobbsrapport "Design and Development of Advanced Web Forum Technology in J2EE" fredag 29/6 kl 11.00 i E:5119.

Välkomna
Christian Nyberg

Exjobbsredovisning 21/6 "Mindre efterklangskammare för akustiska mätningar på mobiltelefoner"

Publicerad: 2007-06-20

Torsdag 21/6 klockan 14.00 redovisas exjobbet "Mindre efterklangskammare för akustiska mätningar på mobiltelefoner", utfört av Joel Persson i samarbete med SonyEricsson Mobile Communications. Redovisningen sker i 2311.

Välkomna!

Exjobbspresentation 21/6 "CNN Template Optimization"

Publicerad: 2007-06-20

Thursday 21 june at 09.00 (sharp) in E:3139:

Eugenia Planas, exchange student from Barcelona (Spain), will present her examensarbete "CNN Template Optimization"

All Welcome!

Abstract
Since their invention in 1988, Cellular Neural Networks (CNNs) have become a more than suitable tool for modelling nonlinear systems. Nevertheless, the need for efficiency improvement in digital emulations requires a radical reduction of the word width in the internal values. The search for robust templates capable of performing an operation successfully while still meeting these requirements becomes, therefore, crucial. Nevertheless, two other parameters must be taken into consideration when it comes to the behaviour of the network: boundary conditions and input images.
Both software and hardware tools are used to evaluate the influence of these parameters in order to obtain templates that are not only robust after truncation, but can also perform an operation correctly under any boundary condition and any input image. The found robust templates pave the way for future research to improve CNN effectiveness.

Advisors: Lambert Spaanenburg and Suleyman Malki

Exjobbsredovisning 21/6 "Meet the i-Cat"

Publicerad: 2007-06-20

Thursday 21 june at 09.35 (sharp) in E:3139:

Barbara Olmedo, exchange student from Madrid (Spain), will present her examensarbete "Meet the i-Cat"

All Welcome!

Abstract
The i-Cat is a robot with a basic software platform and a variety of sensors. It is meant to prototype artificial social behavior in direct interaction with one of more human beings, but also provides further connectivity to a digital network. The design of embedded networks is still unchartered territory. Where requirements capture is already a problem to conventional software engineering, it becomes even more so when the software is distributed and/or embedded. The project aims to investigate how such may be mechanized by copying concepts from movie story writing. It should connect to the existing world of software engineering through the use of UML in order to demonstrate a structured design approach. The effectiveness will be analysed by building such a demonstration on the i-Cat.

Advisors: Lambert (Ben) Spaanenburg

Exjobbspresentation 20/6

Publicerad: 2007-06-15

Johan Jönsson och Magnus Johansson presenterar sitt exjobb med titeln "Arrhythmia Interpretation in Electrophysiological Studies" på onsdag den 20/6 kl 10.15 i Orangeriet.

Välkomna
Martin Stridh

Exjobbspresentation 20/6

Publicerad: 2007-06-19

Onsdag 20/6 13.15 i E:3139: Ricardo Blasco och Gustavo Ambrosio, utbytesstudenter från Spain, presenterar sitt examensarbete "Joint Selection of Channel and Voice Coding for Secure Voice"

Välkomna!

Abstract

This master thesis is a cooperative project between Information Technology department at LTH and Business Security AB, Lund. The goal is to develop a practical solution for voice and channel coding in the framework of an encryption system over certain degraded telephone lines. In order to have safe communications over a plain telephone line it is necessary to digitize information and apply an encryption algorithm. Due to the nature of encryption systems and the telephone channel it is also necessary to add some error control coding system that makes communication reliable. This project is divided into two parts:
-Election of a voice codec (9.6, 4.8 and 2.4 kbps) that guarantees speech quality.
-Design of a coding scheme to mitigate the telephone channel noise so the errors do not reduce significantly the signal quality.

Handledare: John Anderson och Patrik Ekdahl

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Exjobbspresentation 20/6

Publicerad: 2007-06-19

Wednesday 20 june at 14.15 in E:3139:

Cheng Wang and Xiao Yang, SoC Master students, will present their examensarbete "H.264 Encoding in Parallel"

All Welcome!

Abstract
The image compaction standard H.264 pairs improved quality with steeply raised algorithmic complexity. This puts a lot of pressure on the implementation to reach real-time performance. The presentation discusses architectural means to handle parts of the image in parallel. The conventional approach using a cluster of processors with shared memory suffers from synchronisation problems and prolongued latency. A modified motion prediction algorithm is described and tested on a benchmark set. The results show that a distributed memory architecture is feasible at negligible loss in bit rate and picture quality.

Advisors: Lambert Spaanenburg and Rafael Peset Llopis (NXP)

Presentation av examensarbetet 15/6

Publicerad: 2007-06-08

Klockan 14.15 fredagen den 15 juni presenterar Victoria Olsson och Johannes Westström sitt examensarbete

"Studies of antenna diversity performance in mobile terminals"

i E:2311. I studien har Victoria och Johannes undersökt om det går att förbättra mottagningen i en mobiltelefon genom att använda två antenner med liten korrelation.

Välkomna
Anders Karlsson

Exjobbspresentation 15/6

Publicerad: 2007-06-14

Mattias Ahlberg och Per Vahlne presenterar sitt examensarbete "A Next Generation Software Build System", utfört på Ericsson Mobile Platform, fredag 15/6, kl 10:15 i E3139.

Välkomna
Anders Ardö

Exjobbspresentation 14/6

Publicerad: 2007-06-13

Torsdag 14/6 klockan 15.15 presenterar Pálmi Þór Þorbergsson sitt examensarbete om "Nerve-Telemtery System", som är gjort i samarbete med NeuroNano Science Research Center vid LU. Presentationen är i rum E:2311. Välkomna! /Anders JJ.

Kick-off 11 och 12/6

Publicerad: 2007-06-01

Den nya institutionen EIT har kick-off den 11 och 12/6. Det innebär att flertalet av institutionens personal inte är tillstädes under dessa två dagar.

Exjobbspresentation 8/6

Publicerad: 2007-06-07

Patrik Assarsson (E02) and Rickard Hammar (E02) presenterar sitt exjobb: "A Feature Delivery Mechanism for C" 8/6 10:15 i rum E3139.

Abstract
When Ericsson Mobile Platform (EMP) sells the platform to their customers the company delivers most of the source code. This has to be done in order for the customers to be able to configure the platform according to their needs. Under those circumstances the customers get access to information about how the platform is constructed. When it comes to customers that EMP has good relationships with, this is not an important issue. However, in order for the company to expand, new customers have to be acquired. In this case itÇs not desirable to deliver the source code. Today EMP solves this by managing all the configurations internally. Since every customer demands several different configurations for their products, this is a time- and resource consuming process.

There are several different ways to solve the problem of how features can be delivered. One possible solution is to use the concept Product Line. This means that the product is based on a common framework together with possible eligible features. In our case it then would be a matter of dividing source code into common code, feature code and non feature code.

HSWC seminarium 2007-06-05

Publicerad: 2007-05-29

Tisdag, 5/6, kl. 15.15, i E:3139 (Notera tiden)

"Modes of Operation of a Block Cipher"
Prof. Palash Sarkar, ISI, Calcutta, India

Abstract: A block cipher can securely encrypt an n-bit string. Practical applications require encryption of long and arbitrary length strings. A mode of operation is used to extend the domain of a block cipher. Depending on the particular security requirement, there are different modes of operation. We cover the broad issues of modes of operations of a block cipher with emphasis on authenticated encryption (AE). Some recent work on AE will be described.

Exjobbspresentation

Publicerad: 2007-05-30

Fredag 1/6 10.15 presenterar Stefan Lynggaard (E96) and Petter Ericson (F92) sitt exjobb "Barcodes". Det handlar om möjligheten att få Anotopennan att kunna läsa streckkoder utan att göra förändringar av hårdvaran. Plats E:3119.

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Föreläsning om kooperativ kommunication

Publicerad: 2007-05-28

Onsdag 30/5 kl 13.15 i E:3139 kommer Dr. Aria Nosratinia, som besöker Radiosystemgruppen, att föreläsa om kooperatiov kommunikation. Alla intresserade är välkomna.

Title:
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Cooperation, Relay Selection, and the effects of Channel State Information

Abstract:
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This talk presents recent results on relay selection and cooperative partner selection, under various amounts of channel state information. I first consider non-altruistic cooperation in orthogonal channels (no dedicated relays) with only receive-side channel-state information (CSI). Each node is unaware of location and channel gains of other nodes. I show that even under these conditions, local node selection strategies exist to guarantee network-wide full diversity. Then I discuss increasing amounts of CSI and how they improve cooperative gains. Performance bounds under an omniscient network controller are demonstrated.

Time permitting, I will talk about opportunistic cooperation with limited feedback, where it is shown that only two bits of information per user is sufficient to ensure optimal diversity-multiplexing tradeoff, in the case of opportunistic cooperation with dedicated relays. This is a significant advancement over previous methods that required network-wide full CSI at the nodes to achieve opportunistic cooperation.

Disputation

Publicerad: 2007-05-24

Tisdag 29/5 klockan 10:15 försvara Peter Almers sin doktorsavhandling i sal E:1406. Titeln på avhandlingen är MIMO Channels - Measurements and Analysis.

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Studiebesök från Östra Torn 23/5

Publicerad: 2007-05-01

Elever i en klass 6 på Östra Tornskolan kommer till E-huset för en heldag den 23/5. Studiebesöket ingår i E-husets Skolsamverkan (se CDEprogrammen:Grundskola & gymnasium). Engagerade lärare är Monica Almqvist, Elmät och Richard Lundin, Stefan Höst och Jens Andersson från institutionen.