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Electrotechnics, 1988. Conference Proceedings on Area Communication, EUROCON 88., 8th European Conference on

Date 13-17 June 1988

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Displaying Results 1 - 25 of 118
  • EUROCON 88: 8th European Conference on Electrotechnics. Conference Proceedings on Area Communication (Cat. No.88CH2607-0)

    Publication Year: 1988
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    Freely Available from IEEE
  • US cellular network in the 90s

    Publication Year: 1988
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (22 KB)

    Summary form only given. Cellular RF technology needs are described, along with constraints on introducing novel RF technologies. A cellular network architecture referred to as the cellular access digital network (CADN) is described as a proposed basis for the digital cellular network. The concept of the CADN digital subscriber channel and universal service access and the activities associated wit... View full abstract»

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  • The use of digital technology for new mobile services

    Publication Year: 1988
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    Summary form only given. Current and near-future products and services in the area of cellular radio are briefly described, focusing on digital technology. Developments in short-range indoor office communication systems are sketched. The concept of the personal telephone is considered.<> View full abstract»

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  • Propagation aspects of datacommunication over the radio channel-a tutorial

    Publication Year: 1988, Page(s):301 - 305
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (316 KB)

    The various error mechanisms in the time-varying, frequency-selective mobile channel are discussed from a propagation point of view. Starting with a two-ray model, both the frequency and time domain are discussed for the narrowband case, where the delay spread is less than the symbol period, and for the more general broadband case. the major importance of the product of bandwidth and delay spread ... View full abstract»

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  • RNS approach to adaptive Burg algorithm

    Publication Year: 1988, Page(s):130 - 133
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    Digital signal processing using the residue number system (RNS) is an area of renewed and growing research interest. A basic difficulty is the division required by most of the adaptive algorithms. The authors propose a method to implement a unified RNS architecture for both product and general division. The architecture of a whole RNS Burg cell and the layout of the main blocks in a 1.5 μm p-we... View full abstract»

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  • Adaptive decision feedback equalizers to combat time dispersion on the mobile radio channel

    Publication Year: 1988, Page(s):106 - 109
    Cited by:  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (320 KB)

    In mobile radio communication the time dispersion due to multipath propagation is a problem when the bit time used is on the same order as the delay spread. In that case, the intersymbol interference (ISI) can be quite severe. To combat ISI, the author studies the adaptive decision feedback equalizer (DFE), updated with different recursive algorithms. The equalizer is designed for staggered QAM (S... View full abstract»

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  • Design of FIR arbitrary phase filters with prescribed amplitude specifications

    Publication Year: 1988, Page(s):134 - 137
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    A method is presented for designing an all-zero nonrecursive digital filter with arbitrary phase and unity magnitude. The filter is very useful for correcting the phase response of a predesigned IIR (infinite impulse response) digital filter meeting a prescribed magnitude response. The design procedure is based on an algorithm for solving the overdetermined system of linear equations in the Chebys... View full abstract»

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  • A pan-European paging system

    Publication Year: 1988, Page(s):482 - 485
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (312 KB)

    A project that aims to define and establish a common pan-European radio paging system has been launched. A description is given of the background of the project and the progress of the work. The current situation in European paging is sketched. The services provided by the system are outlined. Technical issues are highlighted, and the system is evaluated View full abstract»

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  • Optimal design of a modified code tracking loop

    Publication Year: 1988, Page(s):80 - 83
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (236 KB)

    Optimal design rules are presented for a noncoherent code tracking loop in DS-SS systems. The loop studied here is the modified code tracking loop. Two criteria are considered: the mean time to loss of lock (MTLL) and the probability of error (Pe) in the data due to imperfect synchronization. The MTLL is calculated by solving Kolmogorov's partial differential equation using the... View full abstract»

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  • The SOFTNET project: a retrospect

    Publication Year: 1988, Page(s):343 - 345
    Cited by:  Papers (3)  |  Patents (40)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (252 KB)

    An experimental multihop packet radio network, SOFTNET, is described. The concept of soft protocols for experimental packet-switched networks is introduced. Using this scheme, network nodes can be easily reprogrammed to provide new user services without interrupting normal operation. The SOFTNET network programming language is described. The hardware and software implementation of the network is o... View full abstract»

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  • What next in cordless telephony?

    Publication Year: 1988, Page(s):375 - 378
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    Crucial technical issues in digital cellular and microcellular telephony are reviewed, and it is contended that technology is now ready for a next-generation digital standard, to launch a microcellular telecommunications revolution larger in scope than cellular radio. The European Commission's investigation, which is seeking the pan-European standard, is reviewed. Optimal parameters and means for ... View full abstract»

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  • Function fields and generalized product codes

    Publication Year: 1988, Page(s):166 - 169
    Cited by:  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (276 KB)

    Product codes are generalized by using generator polynomials in two variables (g1(X,Y), g 2(X,Z), etc.) and by interpreting them as polynomials in one variable with coefficients belonging to the field F(X) of rational functions in the variable X over a finite field F. With such an interp... View full abstract»

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  • A multiplex system for simultaneous voice and data transmission using narrowband FM in private mobile radio

    Publication Year: 1988, Page(s):371 - 374
    Cited by:  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (240 KB)

    An integrated system, suitable for the simultaneous transmission of speech and data messages in private mobile radio based on narrowband frequency modulation, is presented as a novel technique offering compatibility with Band III and increased efficiency of spectrum utilization. Some of the problems involved in the practical implementation of the integrated system are examined. The authors present... View full abstract»

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  • Optimal communications filters for multirate applications

    Publication Year: 1988, Page(s):138 - 141
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    The author describes optimal communications filters used for multirate applications. The closed-form solution is presented for the lowpass filtering problem where the passband is constrained to be maximally flat and the stopband energy is minimized. The optimal filter is shown to exist for specific passband constraints which are related to a matrix of the Vandermonde type. The relationship between... View full abstract»

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  • Unequal error protection codes

    Publication Year: 1988, Page(s):174 - 176
    Cited by:  Patents (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (188 KB)

    A method is presented for constructing nonlinear unequal error protection codes. The method uses linear codes as building blocks, thus allowing simple decoding. Comparisons between some two level UEP codes constructed with this method and the direct sum of codes show that these examples perform better than the direct sum of linear codes View full abstract»

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  • The impact of telecommunication standards to industry

    Publication Year: 1988, Page(s):486 - 489
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    A description is given of the impact of telecommunication standards on industry as users and as supplier. An overview of the worldwide standardization organizations concludes with a firm requirement for participation of industry in the European telecommunication standardization. After a description of quality requirements for standards, the actual versions of GSM (CEPT's Groupe Special Mobile) rec... View full abstract»

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  • Speech coding at 9.6 Kb/s and below using vector quantized transform coder

    Publication Year: 1988, Page(s):36 - 39
    Cited by:  Patents (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (292 KB)

    The vector-quantized transform coder (VQTC) is proposed as an alternative to a code-excited linear predicting (CELP) coder. The consideration of more efficient and subjectively meaningful residual quantization allows the VQTC to operate at rates as low as 6 kb/s without significant degradations in speech quality. Below 6 kb/s the quality of the speech was good and did not contain any background no... View full abstract»

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  • Broadband communications: a key strategical issue for Europe

    Publication Year: 1988, Page(s):206 - 209
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (256 KB)

    A description is given of the RACE program, (R&D in advanced communications technologies for Europe), which is intended to provide a framework for all entities interested in a fruitful cooperation concerning the long-term future of telecommunications. RACE is intended to impact the activities of strategic planning/R&D of the European telecommunications sector. It is expected to provide a m... View full abstract»

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  • Cordless telecommunications: towards a digital standard

    Publication Year: 1988, Page(s):379 - 382
    Cited by:  Papers (5)  |  Patents (15)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (308 KB)

    Possible future applications for cordless telecommunications are presented, and the steps towards European standardization which have been taken so far are outlined. Standards currently in existence and in use, including the CEPT CT1 standard, are reviewed View full abstract»

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  • Antenna pattern diversity test with a 250 kbits/s radio modem at 900 MHz

    Publication Year: 1988, Page(s):306 - 309
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (160 KB)

    The use of antenna pattern diversity to reduce errors substantially at low speeds is considered. A scheme is presented which introduces very few errors due to switching transients. The prototype antenna arrangement is bulky and not applicable for commercial equipment. However, new ceramic materials with dielectric constants on the order of 100-200 will reduce the horizontal dimensions by a factor ... View full abstract»

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  • Radio wave propagation aspects for future digital mobile radio systems

    Publication Year: 1988, Page(s):295 - 296
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (132 KB)

    The authors investigate the possibility of using frequencies around 1700 MHz for mobile radio communication, focusing on a comparison of the characteristics of 900 MHz and 1700 MHz radio wave propagation. Radio-wave propagation for mobile radio is broken down into large-scale and small-scale effects. The large-scale variations depend on the BS (base station) to MS (mobile station) distance and als... View full abstract»

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  • The GSM system simulator [mobile radio]

    Publication Year: 1988, Page(s):478 - 481
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (272 KB)

    The GSM (CEPT's Groupe Special Mobile) system simulator is a collection of emulation and measurement tools to be used when testing mobile stations for conformance with the CEPT/GSM recommendations. The author presents functions and requirements for the system simulator. The emphasis is placed on functions for signalling testing, since detailed information on the radio measurement equipment is not ... View full abstract»

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  • Properties and capacity of a TDMA micro cellular office communication system

    Publication Year: 1988, Page(s):363 - 366
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (280 KB)

    Properties of a time-division multiaccess (TDMA) microcellular cordless telephone system using dynamic channel allocation and hand-over are presented. The system has 16 time-division time-duplex channels (slots) per carrier, each occupying 2 MHz. The TDMA frame is 16 ms long and each slot has bits for synchronization, signalling, and data. The data speed is suited for 32 kb/s speech codecs. Proced... View full abstract»

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  • Comparison between different soft decoding algorithms

    Publication Year: 1988, Page(s):177 - 180
    Cited by:  Patents (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (264 KB)

    The authors investigate and compare two different soft decoding schemes. The first approach considered is the algorithm devised by D. Chase (1972). The second approach is based on the idea of generalized minimum distance decoding proposed by D. Forney (1966). This idea was further developed by Blokh-Zyablov (1973) and Zinoviev (1979), who devised a decoding algorithm for concatenated codes. Coding... View full abstract»

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  • Real time implementation of forward gain-adaptive vector quantizer

    Publication Year: 1988, Page(s):40 - 43
    Cited by:  Patents (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (280 KB)

    A realization of a real-time forward-adaptive vector quantizer (VQ) for speech waveform coding on the TMS32010 digital-signal processor (DSP) chip is described. Two encoding algorithms have been implemented: the full search (vector dimension K=5) and search in subcodebook determined by the index and sign of the input vector co-ordinate having maximum magnitude (K=8). The speech s... View full abstract»

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