8th European Conference on Electrotechnics, Conference Proceedings on Area Communication

13-17 June 1988

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  • 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
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (42 KB)

    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 (1)
    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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  • Radio wave propagation aspects for future digital mobile radio systems

    Publication Year: 1988, Page(s):295 - 296
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    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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  • A comparison of multipath effect of digital modulations for mobile channels

    Publication Year: 1988, Page(s):291 - 294
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (240 KB)

    Binary phase-shift keying (BPSK), quaternary phase-shift-keying (QPSK), and minimum-shift-keying (MSK) are compared for transmission over multipath radio channels. The channel is modeled as a two-ray channel, with the reflected ray attenuated in amplitude, phase-shifted, and time-delayed with respect to the direct ray. Computer simulation is used to obtain the bit-error-rate for various fade param... View full abstract»

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  • Decoding of superimposed codes in multiaccess communication

    Publication Year: 1988, Page(s):154 - 157
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (320 KB)

    Ways of sharing a common channel without feedback are considered. The channel is assumed to be a multiaccess OR channel and the decoding problem is considered for a certain class of superimposed codes. A decoding algorithm is proposed and analyzed in terms of maximal decoding complexity. The robustness of the decoding algorithm is tested by simulations of decoding beyond the designed capability of... View full abstract»

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  • A model for combined user premises/local exchange dynamic bandwidth assignment in broad-band communication networks

    Publication Year: 1988, Page(s):189 - 193
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (296 KB)

    A model is proposed of a two-level control structure for the dynamic allocation of bandwidth to different users and different services in the access area of a multiservice network. Essentially, decisions on traffic scheduling within an assigned bandwidth budget are taken locally and independently at the customers' premises, following a simple time-invariant randomized strategy, on the basis of the... View full abstract»

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  • Traffic aspects in future low power, multi-channel trunked systems

    Publication Year: 1988, Page(s):282 - 285
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (260 KB)

    A traffic analysis is presented for a low-power, multichannel, trunked system. A comparison between exponentially distributed and constant holding times is generated by incorporating two delay theory traffic modules, Erlang C and Grommelin-Pollaczek. The effects of queuing and time-out-timing on the system capacity and grade of service are also discussed. Four types of communication systems are in... View full abstract»

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  • Constant weight codes for multiaccess channels without feedback

    Publication Year: 1988, Page(s):150 - 153
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (224 KB)

    The design of superimposed codes for the multiaccess OR-channel is considered. The performance of constant-weight codes when used as superimposed codes is investigated. Several constructions for constant-weight codes are compared: affine geometry codes, projective geometry codes, and codes obtained by code concatenation. A comparison to the sphere packing bound and the Johnson bound is made 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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  • A class of block codes with expanded signal-sets for PSK-modulation

    Publication Year: 1988, Page(s):181 - 184
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (252 KB)

    The authors deal with a block coding approach to channel codes in which the redundancy is obtained not from parity symbols, but by expanding the channel signal constellation. Such codes are well suited for the bandlimited channel because the data rate and the bandwidth are unaffected. For transmission of m information bits/symbol they use the signal set 2m+1-PSK. The signal set... View full abstract»

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  • Broadband communications: a key strategical issue for Europe

    Publication Year: 1988, Page(s):206 - 209
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    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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  • Simulation of multichannel CSMA/CD protocols

    Publication Year: 1988, Page(s):277 - 281
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (348 KB)

    Simulation is used to evaluate the performance of local area networks comprising several parallel broadcast channels to which stations connect by means of separate interfaces. Both the finite and infinite user population cases are considered. Stations can comprise a finite buffer space; when buffers are not available, transmission requests are rejected. The network performance is computed in terms... View full abstract»

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  • Propagation and bit error rate measurements within buildings in the millimeter wave band about 60 GHz

    Publication Year: 1988, Page(s):318 - 321
    Cited by:  Papers (11)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (296 KB)

    There is a significant interest in the millimetric waveband around 60 GHz for providing integrated personal communications for a wide range of digital services to mobile users and data terminals. Furthermore, with recent advances in GaAs technology, the use of 60 GHz in broadband short-range point-to-point links is also the subject of much investigation at the moment. A study of propagation and bi... View full abstract»

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  • FIR design of raised-cosine filters

    Publication Year: 1988, Page(s):146 - 149
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (296 KB)

    Digital raised-cosine filters are designed in FIR form, both by sampling the analog impulse response and by using the frequency sampling method. The author also examines the case when the raised-cosine spectrum must be realized by means of two cascaded filters (in the transmitter and receiver of a telecommunication system). Both the intersymbol and the interchannel interference due to the design a... View full abstract»

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  • Specification methodology applied to the GSM system

    Publication Year: 1988, Page(s):458 - 461
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (312 KB)

    An insight is provided into the methodology applied to the CEPT GSM (Groupe Special Mobile) pan-European digital cellular mobile radio system. A description is given of how decisions and system requirements have shaped the specification methodology. The approach is based on proven practice used in other international specifications. The GSM has supplemented the practice with a comprehensive review... 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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  • From cordless through to personal communications

    Publication Year: 1988, Page(s):11 - 13
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (264 KB)

    The situation in the UK for cordless telephony is outlined as its evolution progresses from the first-generation to the second-generation digital products. Second-generation products provide a diverse range of applications, including cordless business systems and the public Phonepoint service. The evolutionary path to cordless/personal communications products for the 1990s is discussed View full abstract»

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  • A simulation study of local area networks under combined voice and data traffic

    Publication Year: 1988, Page(s):247 - 251
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (196 KB)

    A simulation study is presented of the behavior of a bus local area network working under combined voice and data traffic is presented. The authors have adhered as closely as possible to the IEEE standards 802.3 (Ethernet, CSMA/CD) and 802.4 (token-bus). Curves are given to evaluate the probability of losing voice packets and the average delay of data packets 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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  • Primary rate access (PMXA) in subscriber loops

    Publication Year: 1988, Page(s):202 - 205
    Cited by:  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (260 KB)

    The preliminary rate access (PMXA) connects ISDN (integrated-services digital network) user equipment with 2 Mb/s interfaces to the digital local exchange. At present, two types of network access are provided: the basic access with two user (B) channels and one signalling channel (D) for main stations and small PBXs, and the primary rate access with several basic accesses for medium to large digit... View full abstract»

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  • Statistical properties of advanced sigma-delta modulator with enhanced noise shaping properties

    Publication Year: 1988, Page(s):50 - 55
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (284 KB)

    The structure and the properties of the optimized double integration sigma-delta modulator are investigated. The structure of the modulator is optimized so that the noise shaping property in the baseband is maximized. The stability requirements are taken into consideration. The node voltages of the modulator are evaluated, and the global transfer function optimum where the two feedback coefficient... View full abstract»

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  • CSAP for packet radio networks-a new concurrent slot assignment protocol

    Publication Year: 1988, Page(s):330 - 333
    Cited by:  Papers (7)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (264 KB)

    CSAP (concurrent slot assignment protocol) is proposed to perform concurrent slot assignment, assuming high but limited mobility of the communicating stations. A performance analysis is presented, showing that the protocol achieves fast channel reassignment. The analysis is limited to the heavy traffic assumption (each station wants to transmit continuously), and only one-hop data transmissions we... View full abstract»

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  • High speed data communication by satellite in Europe-the HELIOS architecture

    Publication Year: 1988, Page(s):261 - 264
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    A description is given of the HELIOS architecture, which is based on access points running on OSI data link protocol and acting as gateways between the satellite circuit and a local area network. The access points consist of Bull SPS/7 minicomputers; test of a preliminary version of the software have allowed the successful transmission of files at 128 kb/s between Paris and Brussels. Being totally... View full abstract»

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