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  • 1
    Language: English
    In: European Transactions on Telecommunications, December 2007, Vol.18(8), pp.825-827
    Description: The following nine contributions are dedicated to Prof. Dr‐Ing. Dr‐Ing. E.h. Joachim Hagenauer, who was the Head of the Institute for Communications Engineering at the Munich University of Technology from April 1993 to September 2006. Among the authors are 22 Ph.D. students of Prof. Hagenauer. This editorial provides a brief overview on his enormous contributions to science around Applied Information Theory so far. Copyright © 2007 John Wiley & Sons, Ltd.
    Keywords: Algorithms ; Channels ; Receivers ; State of the Art ; Radio ; Provisioning ; Telecommunications (General) (Ea) ; Article;
    ISSN: 1124-318X
    E-ISSN: 1541-8251
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  • 2
    Language: English
    In: info, 08 May 2009, Vol.11(3), pp.19-30
    Description: Purpose - The purpose of this paper is to propose a service cost model which can be used to evaluate the impact of different management functionalities or network platforms to the service cost.Design methodology approach - Following the validation of the importance that OpEx has on the overall TCO, a classification of the costs is proposed, based on their relation to the network. Two main types of costs have been identified: network based costs and service based costs. Both cost types have been modeled as a set of interconnected processes based on the network and service life cycle respectively. Network and service cost models have been integrated into a single framework. These models have been implemented as Markov chains, which include the dynamic behavior of services. Two different methods for the implementation (analytical versus non-analytical) have been compared from the implementation and computation time point of view. The proposed service model has been used in two case studies: cost comparison of different types of services on different platforms; and impact of the service type distribution on the overall service cost on different platforms.Findings - This paper finds the utility that the proposed cost model has. It has been shown that the impact on the overall service cost that a particular network platform capability such as the possibility of establishing point to multipoint connections has.. The proposed network and service cost models can be used on different types of networks and services.Originality value - The paper presents a general service cost model that can be used to study the impact of any management functionality or network platform has on the service cost.
    Keywords: Financial Modelling ; Operating Costs ; Telecommunication Services ; Economics
    ISSN: 1463-6697
    E-ISSN: 1465-9840
    E-ISSN: 14639840
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  • 3
    Language: English
    In: European Transactions on Telecommunications, December 2007, Vol.18(8), pp.837-843
    Description: Conventionally, detection in multiple‐antenna systems is based on a tree‐search or a lattice‐search with a metric that can be computed by recursively accumulating the corresponding metric increments for a given hypothesis. For that purpose, a multiple‐antenna detector traditionally applies a preprocessing to obtain the search‐metric in a suitable form. In contrast to that, we present a reformulation of the search‐metric that directly allows for an appropriate evaluation of the metric on the underlying structure without the need for a computationally costly preprocessing step. Unlike the traditional approach, the new metric can also be applied when the system has fewer receive than transmit antennas. We present simulation results in which the new metric is applied for turbo detection involving the list‐sequential (LISS) detector that was pioneered by Joachim Hagenauer. Copyright © 2007 John Wiley & Sons, Ltd.
    Keywords: Detectors ; Preprocessing ; Computation ; Communications Engineering ; Computer Simulation ; Antennas ; Telecommunications (General) (Ea) ; Article;
    ISSN: 1124-318X
    E-ISSN: 1541-8251
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  • 4
    Language: English
    In: European Transactions on Telecommunications, December 2007, Vol.18(8), pp.873-879
    Description: This paper gives a brief overview of several applications from the emerging interdisciplinary field of genomic coding theory that aims at applying concepts and techniques from the field of coding theory to problems from the field of molecular biology. This is motivated by the high precision and robustness found in genomic processes in addition to the increase in the availability of genomic data for a wide range of species. The considered applications include source coding for DNA classification, channel coding for modelling gene expression with emphasis on the process of translation, existence of error correcting codes in the DNA and channel coding structure in the genetic code. Example results are presented that demonstrate the relevance of the proposed approaches and open questions are formulated to suggest future research work. Copyright © 2007 John Wiley & Sons, Ltd.
    Keywords: Engineering;
    ISSN: 1124-318X
    E-ISSN: 1541-8251
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  • 5
    Language: English
    In: European Transactions on Telecommunications, December 2007, Vol.18(8), pp.829-835
    Description: A major breakthrough in digital communications was the provisioning of ‘soft’ outputs at each processing stage, with appropriate capabilities to use this as soft inputs in the next processing stage. This allowed for much more performant receivers especially in difficult mobile radio channel conditions, and set the stage for iterative processing. This article will outline the development of soft output algorithms over the last two decades along with associated state‐of‐the‐art applications and conclude with an outlook towards novel applications of the soft principle. Copyright © 2007 John Wiley & Sons, Ltd.
    Keywords: Engineering;
    ISSN: 1124-318X
    E-ISSN: 1541-8251
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  • 6
    Language: English
    In: European Transactions on Telecommunications, December 2007, Vol.18(8), pp.859-864
    Description: The combination of graphical models and belief propagation algorithms has found wide acceptance in the design of communication systems. We extend the general framework of joint source‐channel decoding on graphs to account for estimation problems in which the goal is not to decode the entire data set but to estimate a function of the transmitted data. This problem is deemed relevant, for example in the context of wireless sensor networks. Copyright © 2007 John Wiley & Sons, Ltd.
    Keywords: Channels ; Communication Systems ; Decoding ; Design Engineering ; Algorithms ; Networks ; Acceptance ; Mathematical Models ; Functionals ; Sensors ; Telecommunications (General) (Ea) ; Article;
    ISSN: 1124-318X
    E-ISSN: 1541-8251
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  • 7
    Language: English
    In: European Transactions on Telecommunications, December 2007, Vol.18(8), pp.851-858
    Description: The speech quality in digital mobile communications is improved by using the residual redundancy after speech encoding in source decoding or channel decoding. The latter was investigated at the LNT at Munich University of Technology, the first idea at the IND at RWTH Aachen University. When the two institutes got aware of each other's results, a friendly scientific competition was started by investigating ‘source‐controlled channel decoding’ (SCCD) at the LNT and ‘source optimised channel codes’ (SOCC) at the IND. It turned out, a combination of the two separate approaches would be the best, which led to a fruitful cooperation. The outcome was the ‘joint source and channel coding’ approach, the iterative source and channel decoding (ISCD) and its improvement by applying the extrinsic information transfer (EXIT) chart analysis. In this paper we give a summary of the algorithms and their performances. We also take a look onto the application of the algorithms to real world systems. Copyright © 2007 John Wiley & Sons, Ltd.
    Keywords: Channels ; Decoding ; Speech ; Algorithms ; Coding ; Networks ; Competition ; Redundancy ; Information Transfer ; Encoding ; Telecommunications (General) (Ea) ; Article;
    ISSN: 1124-318X
    E-ISSN: 1541-8251
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  • 8
    Language: English
    In: European Transactions on Telecommunications, December 2007, Vol.18(8), pp.845-850
    Description: We give an overview of iterative techniques for bit‐interleaved coded modulation. We start with simple methods where a convolutional code is concatenated with a standard QAM modulation scheme. The mapping is carefully chosen different from Gray mapping such that significant gains can be obtained by an iterative (turbo) receiver. The idea can also be applied to transmit antenna diversity as well as spatial multiplexing (MIMO). We then consider various powerful iterative coding schemes which are under discussion in standardisation for wireless systems beyond 3G such as serial or parallel concatenated convolutional codes, repeat accumulate codes and LDPC codes. We give a comparison in terms of complexity and performance.The main intention is to provide an illustrative overview over relevant applications of the turbo principle in demodulation and decoding. It is a summary of results which have been obtained in collaboration between the Institute of Communications Engineering, TUM and DoCoMo Euro‐Labs. Copyright © 2007 John Wiley & Sons, Ltd.
    Keywords: Modulation ; Coding ; Mapping ; Demodulation ; Antennas ; Multiplexing ; Decoding ; Standards ; Design Engineering ; Receivers ; Communications Engineering ; Telecommunications (General) (Ea) ; Article;
    ISSN: 1124-318X
    E-ISSN: 1541-8251
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  • 9
    Language: English
    In: European Transactions on Telecommunications, December 2007, Vol.18(8), pp.881-886
    Description: A novel system‐level simulation environment is presented for the evaluation of step‐index polymer optical fibre transmission systems. Key element is a new fibre model, which incorporates the three major attributes describing light propagation in SI‐POF: the mode‐dependent attenuation, the modal dispersion and the mode coupling process. Inter‐symbol interference (ISI) due to modal dispersion can be mitigated in the receiver by means of electronic dispersion compensation. In this work, we present the performance of an analog equaliser scheme based on a (sub‐)optimal ‐probability (APP) technique, which increases the achievable fibre length for error‐free transmission at 1 Gbit/s from 11 to 53m. Copyright © 2007 John Wiley & Sons, Ltd.
    Keywords: Dispersions ; Mathematical Models ; Optical Fibers ; Electronics ; Lithium ; Computer Simulation ; Fibers ; Compensation ; Attenuation ; Receivers ; Joining ; Propagation (Polymerization) ; Interference ; Communications Engineering ; Telecommunications (General) (Ea) ; Article;
    ISSN: 1124-318X
    E-ISSN: 1541-8251
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  • 10
    Language: English
    In: European Transactions on Telecommunications, December 2007, Vol.18(8), pp.865-872
    Description: Mobile TV started almost 30 years ago as a research project, but only just recently TV‐like services for mobile users on handheld devices have become reality. In this work, we want to give an overview of both the history and current advances in this highly active field of research, including unicast and broadcast media streaming over wireless channels and efficient forward error correction (FEC) mechanisms at the application layer. Copyright © 2007 John Wiley & Sons, Ltd.
    Keywords: Engineering;
    ISSN: 1124-318X
    E-ISSN: 1541-8251
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