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Background
ECC Steering group published its five year strategy to strengthen and enhance Europe's electronic communications policy. The ECO is tasked to “develop relations with universities and relevant scientific institutes that would be willing to do research in spectrum management and give advice to research institutes on issues to investigate or on specific research”. |
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Following areas of research are covered:
UWB area of research
1. Institute of Radioelectronics, Warsaw University of Technology
One of the first projects dealt with the development of UWB signal sources and methods of signal reception.
At present the research activity is focused on leading edge detection receivers intended for reception of ultra-wideband pulses. The need for precise determination of the moment of UWB pulse arrival is specific to the receivers used in positioning systems. In case of the threshold detection (leading edge detection receivers operation is based on it) the uncertainty of pulse position determination mainly depends on:
- relation between pulse amplitude and shape, and the chosen threshold,
- influence of interfering signals.
The research activities are focused on various methods for reduction of this uncertainty. Due to the signal used (very short pulses emitted with low repetition frequency) the task is very demanding. At present, the following solutions are being analyzed:
- implementation of automatic gain control circuits,
- methods for reliable evaluation of UWB pulse amplitude and shape (and finally reduction of uncertainty by software means)
- application of software methods using known and estimated features of ultra-wideband propagation channel (channel models, antenna patterns etc.)
In order to compare efficiency of particular solutions the research group is also working on methods and criteria that can be used for evaluation of receivers. Tests include investigation of typical receiver parameters describing sensitivity and immunity to interfering signals.
2. University of Applied Sciences, Dresden
The (HTW) Spectrum Engineering related research activities mainly cover two topics:
i) Research group is involved in UWB research and development for many years, both for low and high data rate devices. Therefore, coexistence issues within the UWB frequency bands (3.1-10.6 GHz) are of special interest. The work is focused but was not limited to Satellite Services, Fixed Services, Military Systems, Passive Services (in the frame of PULSERS, EUWB, CEPT ECC TG3, WG FM47, PT SE24).
ii) Research group is investigating and developing hardware and software for low energy communications (sensor) networks. These networks can use UWB frequency bands, but are also very common in the ISM and SRD bands. To ensure proper operation of the devices in these bands particular studies in terms of coexistence are performed and planned to be continued (ETSI TG28, CEPT WGFM).
3. Ultra-wideband signals and antennas for radiocommunication systems (Bialystok University of Technology, Poland)
Time and frequency analysis of ultra-wideband (UWB) signals
Three basic UWB signals for FCC frequency band 3.1-10.6GHz were considered: Gaussian, Rayleigh pulses and wavelets. Spectrum width of Gaussian and Rayleigh pulses are wider than UWB operation band, so some additional distortions exist after reverse Fourier transformation of signals. Time analysis and spectrum of different kinds of pulse modulations: PAM, BPM, PPM and PPM with randomization were investigated. All considered pulses with optimal parameters regarding FCC frequency range for some modulation were used for the excitation of worked out UWB antennas and antenna arrays.
Matched UWB planar pulse antennas
A complex approach to design, synthesis and optimization of UWB antennas was proposed. This approach connects time and frequency analysis of UWB signals with a design of the whole antennas with excitation circuits, the analysis of the near electric and magnetic field distributions, current distribution, radiation patterns and also analysis of radiation, transmission and UWB signals reception with maximal resolution in time domain. An antenna transmittance, an intensity of electric field for 1V sinusoidal excitation of antenna, was used for the calculation of spectrum of radiated UWB pulses; these field pulses were received after a reverse Fourier transformation.
About 20 matched planar UWB pulse antennas with an optimal matching line and minimal dimensions were designed for work in UWB FCC frequency band 3.1-10.6 GHz. All antennas have input VSWR<2, a good radiation pattern and satisfactory emitted UWB field pulses.
Two-element matched UWB planar antennas
A design and computer simulation of the matched planar microstrip two-element antenna for UWB application in the whole FCC frequency range 3.1-10.6GHz were fulfilled in this research. A complex approach to the design and analysis of UWB antennas was used for construction of this array. A synthesized antenna has minimal dimensions, taking into consideration coupling between radiators and optimal excitation matching lines to obtain desirable characteristics of standard UWB signals radiation. Different matrices were used for simulation of this antenna. Using a two-port broadband uncoupled-matched device (hybrid) this antenna radiates two different UWB signals at the same time in the same frequency band.
Read more about scientific research at Bialystok University of Technology during last 6 years here.
Wireless M2M communications area of research
Scientific project plan ”Reliable Wireless Machine-to-Machine Communications in Electromagnetic Disturbed Industrial Environments”
Project consortia
University of Gävle (project manager); Swedish Defence Research Agency; SSAB Tunnplåt AB, Åkerströms Björbo AB; Syntronic AB; Agilent Technologies Sweden AB; Stora Enso Kvarnsveden AB; Green Cargo AB
Objective
The main objective of the project is to create improved technical solutions for increased reliability of wireless applications in industrial environments. To create this goal the following three Industrial and scientific problems are addressed:
1. Characterization of the total electromagnetic interference in selected frequency bands for wireless applications in industrial environments. Focus on measurements and model development. Both interference signals and wave-propagation properties are investigated.
2. Assessment of the sensitivity of present wireless technologies to the industrial interference environments characterized.
3. Improvement of selected present communication technologies in order to increase the robustness against the industrial interference environments characterized.
Output
• Models of the electromagnetic interference in industrial environments.
• Models of the wave-propagation properties (multipath) in industrial plants.
• Assessment of the sensitivity of selected present wireless technologies to this interference. Guidelines for choice of optimal off-the-shelf products in system design.
• Improvement of present communication technologies and products by prototype development.
Cognitive radio area of research
1. COST-TERRA project
Objectives (Primary):
Developing a comprehensive techno-economic regulatory framework of radio spectrum access rules for CR/SDR, catering for envisaged CR/SDR deployment scenarios and fostering the development of the wireless industries and consumer interests at large.
Secondary:
Assistance (in the form of know-how) to European regulators and regulatory/standardisation bodies, such as CEPT, ETSI, EC.
Work programme:
· research into development of plausible deployment scenarios for CR/SDR, based on results of current and future technological R&D activities
· research into what regulations would be technically feasible
· research into what regulatory regime would be economically attractive
· research into overall impact assessment and societal benefits of developed regulatory scenarios
Two distinct phases:
Pre-WRC-2012 – defining the stage and trying to build up material that might be fed into WRC process in the shape (or as a part) of an European Common Proposal.
Post-WRC-2012 – completing analysis taking note of WRC decisions on the issue of CR.
For further information with respect to COST-TERRA project please visit web-site.
2. Research activity on cognitive radio systems (VTT Technical Research Centre of Finland)
Research on cognitive radio systems includes studies on cooperative spectrum sensing techniques, intelligent channel selection methods and cognitive control channels, as well as the area of power control. Spectrum sensing studies include algorithm work, combining methods for cooperative sensing, and both soft and hard decision investigations. Channel selection has been studied taking into account network topologies and history information databases. Both short term and long term information have been considered to make predictive channel selections possible. Methods include intelligent schemes for selecting sensing devices, channels to be sensed, and channels to be used for cognitive communication. For example, application of fuzzy logic has been considered. Algorithms for adaptive power control as well as methods for estimation of power limits in cognitive radio system have been investigated taking characteristics of primary systems and performance of spectrum sensors into account. Studies on cognitive control channels include future development of cognitive pilot channel (CPC) and cognitive control radio (CCR) into cognitive control channels (CCC). VTT has also been working on the "Cognitive radio systems in the land mobile service" - Report in the ITU-R.
3. COGEU (COGnitive radio systems for an efficient sharing of TV white spaces in European context)
COGEU executive summary:
The COGEU project is a composite of technical, business, and regulatory/policy domains, with the objective of taking advantage of the TV digital switch-over (or analogue switch-off) by developing cognitive radio systems that leverage the favorable propagation characteristics of the TV White Space through the introduction and promotion of real-time secondary spectrum trading and the creation of new spectrum commons regime.
COGEU will also define new methodologies for TVWS equipment certification and compliance addressing coexistence with the DVB-T European standard and wireless microphones.
See COGEU presentation here.
4. Center for Wireless Systems (Copenhagen University College of Engineering, Copenhagen, Denmark)
Resistance against Jamming
Research of opportunities, needs and expectations of future automated warfare in light of embedded wireless sensor network (WSN) is conducted. Focus areas are spectrum use and management of autonomous self-configuring covert wireless sensor networks incorporating cognitive behavior. A number of modern cognitive system enablers consisting of: (MC)-DSSS, FHSS, OFDM are discussed and compared with the transform domain communication system (TDCS).
Primary research focuses on low probability of detection / interception (LPD / LPI) properties in terms of WSN transmitter system visibility. These parameters are analyzed in light of modern detection methods, such as radiometers and energy detecting systems. Moreover, analysis is carried out with respect to modulation behavior and resistance / strength against jamming.
These parameters are the backbone for the TDCS system. Offering cognitive time / frequency domain controlled behavior as e.g. dynamic spectrum shaping management. Thus TDCS based cognitive spread spectrum systems provides a high level of interference and anti-jamming capabilities.
5. University of Oulu (Centre for wireless communications)
COGNAC (Cognitive and opportunistic wireless communication networks) is a national (Finnish) research project with a main aim to develop fundamental knowledge on the techniques of opportunistic spectrum usage for broadband wireless communication systems enabling the provision of multitude of services. In addition to the development of practical techniques and solutions, an equally important goal is to achieve good understanding on the fundamental behavior of opportunistic and heterogeneous traffic behavior in order to develop suitable models for analysis and simulation purposes. This three year project is ending at the end of 2010. More than 35 scientific journal and conference articles have been produced. Cognac is funded by the Finnish Funding Agency for Technology and Innovation, University of Oulu (Centre for Wireless Communications) and VTT Technical Research Centre of Finland.
6. Euler-project (EUropean Software Defined Radio for wireless in joint security operations)
EU FP7 Security-programme is funding a three year Euler-project (EUropean Software Defined Radio for wireless in joint security operations). The EULER project aims to define and demonstrate how the benefits of SDR can be leveraged in order to drastically enhance interoperability and fast deployment in case of crisis needed to be jointly resolved. The activities span the following topics: proposal for a new high-data-rate waveform for homeland security, strengthening and maturing ongoing efforts in Europe in the field of SDR standardisation, implementation of Software defined radio platforms, associated assessment of the proposal for high-data-rate waveform for security, and realisation of an integrated demonstrator targeted towards end-users. Significant interaction with E.U stakeholders in the field of security forces management will contribute in shaping a European vision for interoperability in joint operations for restoring safety after crisis. Euler will continue till March 2012. Euler web-site is www.euler-project.eu
7. Aalborg University (Radio Access Technology Section (RATE))
Within the RATE Section at Aalborg University, the major keyword associate to Cognitive Radio is Dynamic Spectrum Allocation. The research spans then from game-theory and graph-theory models of the interference and coexistence problems, to the practical support of the designed algorithms in the traditional communication protocol stack, including channel sensing, channel feedback, Medium Access Control (MAC), and over all, Radio Resource Management (RRM).
8. Aachen University (Germany)
Cognitive Radio Technologies: this sub-group of the Aachen University is mostly considering quite wide-scope of technology enablers. Research is considering cognitive radio and CR network architectures, cognitive radio resource management, open interfaces for information exchange, and quite a lot of theoretical research issues such as topology control, spectrum detection etc.
Spectrum Monitoring and Modelling: in this sub-domain Aachen University conducting a lot of spectrum occupancy measurements, not only in Germany but also in other countries. A big part of the work is not only to measure spectrum occupancy, but also to develop standardised metrics and methods to make them and exchange the data. In theoretical domain Aachen University is working with a quite big team on developing spatiotemporal models for spectrum usage. In this domain Aachen University also cooperates with silicon and asic groups on understanding and developing new spectrum measurement techniques that could be cheap and widely deployed.
Spectrum Policy Technologies: although Aachen University do not work in the policy making area, they have been working on spectrum and radio policy languages, and even experimented with a modified CoRAL spectrum servers.
Spectrum Occupancy Assessments: closely related to spectrum modeling, Aachen University is working in cooperation with some economists and industry, on developing better methods for understanding spectrum value and how to decide between different possible spectrum policies.
Future Wireless Systems Group: FWS sub-group is working apart of the above spectrum issues with flexible & adaptive radio technologies, and low-power consumption issues. A part of the work is systems level work, and part of it is more on component level enhancements.
Information on the activities relating to Cognitive Radio Systems (CRS) and Software Defined Radio (SDR) systems within CEPT is presented here.
Research activity on IMT- Advanced systems
1. VTT Technical Research Centre of Finland
In IMT-Advanced research, VTT participated in the ITU-R spectrum demand calculation for IMT-Advanced in preparation for WRC-07. VTT participated in the development of several ITU-R Recommendations and Reports and authored five book chapters on the topic. VTT also participated in the definition of minimum requirements for IMT-Advanced at the ITU-R and the evaluation of the candidate IMT-Advanced technologies.
2. Center for TeleInfrastruktur (CTIF) at Aalborg University, Aalborg, Denmark
CTIF is strongly contributing to advancing state of the art and standardisation of LTE-Advanced and IMT-Advanced systems with research projects in the area of Flexible Spectrum Usage in Self-Organizing Networks; Cooperative Spectrum Sensing, Cognitive radio, Spectrum and Carrier Aggregation. Among others, CTIF has a secure cognitive network test bed (S-COGITO) able to showcase flexible spectrum usage on cellular networks towards the improvement of user experience and spectral efficiency.
In particular, for the area of spectrum and carrier aggregation, work is focused on the modeling and simulation aspects of these two enabling techniques for IMT-A and their integration with proposed frameworks for upper layers radio resource management strategies. Current work has proposed an integration of spectrum aggregation strategies with common radio resource management as specified for LTE and LTE-A for a scenario of non-contiguous bands for a single and multiple operators, with the objective of increasing the overall system throughput by a better user allocation in the shared band in consideration of the quality of service requirements of the user and the available system resources. In this context a novel multi-band scheduling strategy has been proposed that manages the balance between the data pipe and the obtained extra source of spectrum, and performs an optimized user scheduling. The radio allocation mechanism allocates the user packets to the available radio resources in order to satisfy the user requirements, and to ensure efficient packet transport to maximize spectral efficiency and is part of the overall set of radio resource management mechanisms. This enables the pooling of the resources together; while the integration allows for mapping of the service requirements onto an available spectrum amount and translates the latter into network load. The approach uses the widely separated frequency bands for achieving lower delays and jitters and higher user throughput by exploiting the channel diversity. These show independent Channel Quality Indicators (CQIs) over time and space, which becomes a source of diversity at the Physical (PHY) layer, allowing for opportunities for higher spectrum efficiency. Information from the network about the system state (e.g., received signal strength, transmitted power, user terminal velocity, etc) and used in RRM procedures such as load, admission and congestion control can successfully be combined with dynamic spectrum use and reduce the need of spectrum aggregation in some cases. Related current work is targeting novel spectrum-aware network discovery and mobility management strategies for IMT-A systems.
3. Center for Wireless Systems (Copenhagen University College of Engineering, Copenhagen, Denmark)
Quality of Service Estimation
4G communication uses LTE and Advanced LTE with foundation of OFDM to avoid ISI and achieve high spectral efficiency. Security is main issue in these comprehensive wireless communication systems, which are subjected hostile environments. To avoid jamming, interference or interception and efficient spectrum usage, it is fundamental requirment to use cognitive approach. Actually, the backbone in this approach is to notch out those channel/subchannels with low QoS parameters and hopping between the available good quality channels.
QoS in OFDM/ OFDMA where the subchannel have the same center frequency but different users use these subchannels. By using this technique, high data transmission rate is achieved among multiuser simultaneously. The basic modulation scheme such as BPSK, QPSK, etc., can be used. While using Phase Modulation schemes, EVM is the best parameter to measurement quality of service from which BER can be calculately easily. Depending on BER of the subchannel, it can decided to notch out for a specific time period to avoid antijamming attacks such as DoS.
Encryption at Physical Layer
Future 4G/5G wireless links are expected to move beyond Giga bit bandwidth making it difficult to encrypt/decrypt data in real-time at application layer or link layer of devices using their general purpose processing unit. Dedicated hardware for encryption/decryption is required.
Most wireless devices in 5-10 years will be based on cognitive radio technology for intelligent spectrum management. The central part of such radio is a high performance FPGA which is able to carry out the needed signal processing for, e.g., OFDM.
In this research we combine encryption/decryption with the radio physical layer signal processing and in this way use same FPGA for both at same time. This will save hardware and reduce the price and the approach is expected to save power as well. Standard FPGAs year 2010 are able to encrypt or decrypt 10 Giga bit per sec. or more with AES using 128 bit key.
4. Aalborg University (Radio Access Technology Section (RATE))
Aalborg University is performing research related to spectrum management and radio resource management for LTE –Advanced: two main topics are Carriers Aggregation (CA - and RRM for CA), and Autonomous Component Carrier Selection (ACCS):
Under the CA topic, several challenges and techniques related to the utilization of multiple Component Carriers (CCs), are researched. This includes aspects of CC in different frequency bands and also paired and unpaired carriers.
ACCS is meant for unplanned deployment of Home eNB in Local Areas, where one or several operators can optimally assign and share spectrum among the autonomous Home eNB’s according to time varying interference and load conditions.
FP7 BeFEMTO EU project
ECO has been invited to be part of an Advisory Group of the FP7 BeFEMTO EU project (BeFEMTO project: http://www.ict-befemto.eu/) that will meet physically about once a year. BeFEMTO is a proposal which was submitted to the next Call 4 within the Framework Program 7 (FP7) of the European Commission (EC) and has been recently approved. This consortium is targetting LTE-Advanced Femtocells as a key enabler for achieving new Radio Access enhancements, thanks to innovative Interference Mitigation algorithms, Networking aspects and Routing algorithms, whilst supporting new services & applications and where the regulatory aspects are playing a key role for the Femto deployment success. The BeFEMTO is focusing not only on Home Femto but will address FemtoNets (Mesh in Corporate or Building environment, together with Outdoor Fixed-Relay and Mobile Femtos where the key selling points will be higher spectral efficiency to enable true wireless broadband, and decreased Transmit Power). BeFEMTO project has gained momentum since their Kick-Off meeting in January 2010. 5 Technical Internal Reports (Confidential) have been released to European Commission.
Electromagnetic compatibility (EMC) of radio systems, networks and space-scattered fields, including its electromagnetic safety (EMS) and electromagnetic ecology (EME)
(Belarusian state university of informatics and radioelectronics R&D laboratory of electromagnetic compatibility).
Research of fundamental properties of electromagnetic environment (EME) formed in places with high population density at mass application of modern and perspective systems of radio telecommunications (cell phones, mobile Internet, RFID systems, various wireless industrial and residential controlling equipment, etc.), and also taking into account a quasi-stationary electromagnetic background of a various nature (man-made noise, powerful broadcasting stations, radars, etc.).
Statistical properties of EME in space-scattered wireless networks and fields of multi-users radio equipment affecting its intra-network EMC and EMS are studied. The analysis is based on the standard propagation channel model, a Poisson model of random spatial distribution of transmitters, and a threshold-based model of the victim receptor behavior (radio receiver or human body). An original statistical models of ensembles of interferences for this conditions are proposed. Invariance of these models to fading and to e.i.r.p. distribution of transmitters at constant spatial density of the last is proved.
This models give possibilities to quantify the positive effect of linear filtering (e.g. by directional antennas) and to propose a generalized system EMC parameters of radio receivers, transmitters and antennas. The analysis results in formulation of a tradeoff relationship between the network density and the outage probability, which is a result of the interplay between random geometry of node locations, the propagation path loss and the distortion effects at the victim receiver.
Collaboration with Radio Systems Research Group at University of Vigo (Spain)
Main research line is about the characterization and modeling of the radio channel, indoors or outdoors, terrestrial or for satellite links, in a wide range of frequencies, from UHF to 60 GHz, using general purpose equipment as spectrum analyzers, or using radio channel sounders specifically designed, built and calibrated in the group. The characterization and modeling refers to narrowband or wideband channel response, fading, delay spread, interferences and noise, including shot noise. Research group is designing systems that use different techniques to mitigate the channel impairments and develop and test prototypes of these systems.
Other research lines deal with electromagnetic smog and innovative techniques to reduce the human exposure to electromagnetic fields, mainly in sensitive areas, as schools. Research group also developed several detection and location systems base on GPS (outdoors), automotive radar, Zigbee networks or RFID. Research group is currently working on a research project (RFID- from Farm to Fork) related to food traceability based on RFID, funded by the EU under the VII Framework.
Collaboration with research centre IBBT-SMIT (Vrije Universiteit, Brussel)
In general, research center performs socio-economic impact assessment and business modeling with regard to Future Internet technologies. Many of past and current projects revolve around advanced wireless technologies, and dedicate particular attention to spectrum management issues, especially in the field of Cognitive Radio Systems and Software Defined Radio. Activities include construction and validation of business scenarios, developing business architectures and, more recently, wider impact assessment (for example looking at issues of sustainability and linking new communications technologies to higher level policy goals such as energy efficiency). Research center is also dealing with comparison business issues between Cognitive Pilot Channel, spectrum sensing and database approaches.
Current projects include:
- CONSERN (EU FP7 STREP project on cognitive self-growing energy efficient networks);
- UNIVERSELF (EU FP7 IP project on autonomic functionalities for converged future internet systems);
- ESSENCES (Flemish Research Council funded project on spectrum sensing, including regulatory and business analysis);
- NG Wireless (Flemish IBBT funded project on radio systems co-existence and co-operation, in which research centre investigates cost issues related to interference).
Collaboration with Institute of Geodesy and Navigation (University FAF Munich, Germany)
The Institute of Geodesy and Navigation at the University FAF Munich is doing many research activities investigating the feasibility of the provision of GNSS services in the band 2 483.5 – 2 500 MHz and 5 010 – 5 030 MHz with special focus on:
• Identification of advantages and drawbacks for the service providers and for the users
• Interference issues with other services transmitting in the neighbor bands
The Institute of Geodesy and Navigation at the University FAF Munich is consulting the German Aerospace Centre (DLR), the Federal Government and Ministries and the European Commission in many coordination activities:
• ICG - International Committee on GNSS (Multilateral forum setting out the high level objectives and definitions of interoperability and compatibility)
• Bilateral forums with the different GNSS providers (Transfer of high level objectives regarding interoperability and compatibility into technical methodology and criteria)
Read more about the Institute of Geodesy and Navigation at the University FAF Munich here.
SEAMCAT issues
1. Work at the International Symposiums on EMC
In September 2010, the ECO took part in the organisation of one day workshop organised at the 9th International Symposium on EMC joint with 20th International Wroclaw Symposium on EMC (EMC Europe 2010) in collaboration with representatives of the National Institute of Telecommunications.
At the EMC Symposium ECO was invited to organise one day SEAMCAT workshop during ICTP (International Centre for Theoretical Physics) – ITU (BDT) workshop on applications of wireless sensor networks for environmental monitoring in developing countries.
2. Work at the 3nd International Workshop on Cognitive Radio and Advanced Spectrum Management
The ECO is invited to present SEAMCAT to CogART 2010 (the 3nd International Workshop on Cognitive Radio and Advanced Spectrum Management, organised by institutions including the Universities of Aarlborg and Rome), which this year will be held in Rome in November 2010.
3. SEAMCAT usage outside CEPT (for the purpose of AI 1.17 WRC-12)
The research is funded by the Malaysian Communication and Multimedia Commission (MCMC) as a part of Malaysian Spectrum Research Working Party 3 (WP3) that involve in preparation for the WRC-12 under the agenda item 1.17.
For these purposes, the research consider the identification the spectrum for systems operating in the 790-862MHz taking into account that the operation of broadcasting stations and IMT-Advanced service in the same geographical area may create incompatibility issues.
This research activity considers both deterministic method applying Minimum Coupling Loss (MCL) and statistical using the Monte Carlo approach proposed in SEAMCAT to determine coexistence requirement and performance evaluation for both systems. Results will assess the current ongoing research in the digital dividend band for the possibilities of coexistence between the mobile and the broadcasting service to operate without performance degradation. The intersystem interference mitigation will be investigated.
4. Symposium and Exhibition on Electromagnetic Compatibility (Poland)
The Wroclaw EMC Symposium is an oldest European regular International Symposium on Electromagnetic Compatibility issues organized in Wroclaw (Poland) since 1972. Since 2010, the Wroclaw Symposium is part of EMC Europe Symposium. This year EMC Europe 2010 will celebrate 20th edition of the Wroclaw International Symposium on EMC.
The symposium gives the unique possibility to present the progress and results of the work and to exchange ideas, discuss different points of view and share experiences with colleagues involved in electromagnetic compatibility of devices and systems, spectrum management, monitoring and congestion.
Since 2002 the ECC (on behalf of SEAMCAT Management Commitee (now the SEAMCAT Technical Group (STG)) and the ERO (now the ECO) experts working with compatibility issues are attending International Symposiums on EMC (Wroclaw, Poland). A number of papers dealing with spectrum management relating to the introduction and deployment of different applications were presented discussed during these Symposiums. Some of them were focused on SEAMCAT and can be downloaded from the right hand side of this page. They also addressed various issues relating to the ongoing activities within the ECC (satellite, terrestrial, RRC-06).
In September 2010, the ECO took part in the one day workshop organised at the 9th International Symposium on EMC joint with 20th International Wroclaw Symposium on EMC (EMC Europe 2010) in collaboration with representatives of National Institute of Telecommunications. This EMC Symposium held under the auspices of Dr Hamadoun I. Touré (Secretary-General of the ITU).
5. Collaboration with Polish National Institute of Telecommunications
In December 2009, the Polish administration presented at the STG meeting document dealing with the external propagation model can be used within SEAMCAT. The Longley-Rice (Area prediction model) propagation model was developed as Seamcat plug-in in the National Institute of Telecommunications (Poland) in co-operation with the Wroclaw University of Technology (Poland). The task was performed under Research Project of the Polish Ministry of Science and Higher Education entitled: Next generation teleinformatics services - technology, application and market aspects (no. PBZ-MNiSW-02/II/2007).
Longley-Rice model (also known as the Irregular terrain model (ITM)) was created for the needs of frequency planning in television broadcasting in the United States in the 1960s and was extensively used for preparing the channel plans for VHF/UHF broadcasting. Longley-Rice has two parts: a model for predictions over an area and a model for point-to-point link. It works for the distances between 1 – 2000 km, in a wide frequency range from 20 MHz to 20 GHz.
In addition, in January 2010, the Polish National Institute of Telecommunications has provided the ECO with an implementation of P.1546-3 “Method for point-to-area predictions for terrestrial services in the frequency range 30 MHz to 3 000 MHz” .
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ECO contact for Research Activity related enquiries: Stella Lyubchenko (ECO) e-mail "lyubchenko@ero.dk" or phone +45 33 89 63 09 |
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