1993 Fourth European Conference on Radio Relay Systems

11-14 Oct 1993

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Displaying Results 1 - 25 of 62
  • Considerations on SDH radio relay systems management

    Publication Year: 1993, Page(s):162 - 166
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (272 KB)

    Highlights some management aspects related to SDH digital radio relay systems (SDH DRRS in the next), in order to allow a full integration between SDH DRRS and other SDH network elements. The analysis deals with STM-1 radio relay systems, but it can be extended without significant modifications to other transport levels (sub-STM-1, STM-4, etc.). The following, basic structure of SDH management sys... View full abstract»

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  • The benefit of cross-polar co-channel operation in digital radio networks

    Publication Year: 1993, Page(s):167 - 174
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (484 KB)

    Digital radio systems with co-channel operation are a powerful and economic transport medium for modern transmission networks. Thereby co-channel operation provides an extremely efficient use of radio frequency resources, offers economical solutions for capacity extensions and re-utilization of existing infrastructure, and gives advantages in densely meshed radio networks. The performance and reli... View full abstract»

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  • Loss of pointer in SDH digital radio relay systems

    Publication Year: 1993, Page(s):134 - 139
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (308 KB)

    The use of synchronous digital hierarchy (SDH) in digital radio relay systems (DRRS) requires the analysis of the effect of error statistics on the transmission frame. In fact, due to the recent adoption in high capacity SDH DRRSs of transmission techniques such as low redundancy error-correcting codes, trellis coded modulations, Viterbi receivers, etc., the errors produced in the presence of nois... View full abstract»

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  • Results of 2 year measurements on a 18 GHz radio link: rain unavailability considerations for radio relay systems at low and high capacity

    Publication Year: 1993, Page(s):175 - 180
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (328 KB)

    The use of radio frequencies for transmission and reception of digital signals above 10 GHz is practically limited by the effect of rain. The water drops adsorb and diffuse the radio signal, producing an attenuation that increases with rain intensity and depth of the rain cell. The system becomes unavailable when this attenuation equals its FFM, (flat fade margin) producing BER ⩾10-3 View full abstract»

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  • Economics of local loop competition by radio access

    Publication Year: 1993, Page(s):9 - 14
    Cited by:  Papers (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (236 KB)

    Describes the economics of radio access in the local loop, compares the attractiveness of competing technologies and concludes that there are no general solutions. Each potential service area must be analysed separately in order to determine the optimum mix of technologies. In general radio based technologies appear best suited to low population density areas with GSM solutions appropriate for wid... View full abstract»

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  • 58 GHz technology and experimental link

    Publication Year: 1993, Page(s):302 - 306
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (216 KB)

    Trends in military and civilian communication systems lead to the increasing use of millimeter wave frequencies. Among those the 60 GHz band is particularly interesting due to the atmospheric absorption (frequency reuse, discretion). Alcatel Telspace has studied millimeter waves technologies allowing the development of a new millimeter wave products generation. The paper describes the results of t... View full abstract»

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  • Methods for ascertaining radar interference into high capacity radio relay receivers

    Publication Year: 1993, Page(s):221 - 226
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (356 KB)

    The operational surveillance of radio relay equipment carrying normal traffic has become common within many administrations. The parity check feature of the radio frame is exploited to derive an estimate of the bit error rate (BER) and subsequently the number of events (seconds) when a certain BER is exceeded is cumulated. Thus one may estimate whether the performance of a particular transceiver/r... View full abstract»

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  • An evolutionary approach to the management of SDH radio equipments

    Publication Year: 1993, Page(s):140 - 147
    Cited by:  Papers (1)  |  Patents (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (396 KB)

    A number of radio relay and fibre optic systems are required to be remotely controlled and monitored. Year by year customer's requirements are becoming more and more demanding in order to achieve an effective supervision of the network. With SDH equipment these requirements are becoming even more complex to be satisfied. The paper illustrates Siemens Telecomunicazioni's approach to provide a satis... View full abstract»

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  • Blind algorithms for joint clock recovery and baseband combining in digital radio

    Publication Year: 1993, Page(s):279 - 286
    Cited by:  Patents (10)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (412 KB)

    A strategy is illustrated for joint space diversity baseband combining and timing recovery in microwave digital radio, based on a phase-independent criterion. The proposed receiver both provides a steady-state performance close to minimum mean square error receiver and solves the problems related to system synchronization, with an effective synergic action of clock recovery and adaptive baseband c... View full abstract»

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  • Equivalence relations between angle diversity and other diversity methods. Analytical model and practical results

    Publication Year: 1993, Page(s):261 - 265
    Cited by:  Papers (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (288 KB)

    Diversity reception is an efficient means to improve signal quality or to reduce outage time in radio-relay systems. Already well known from application in analogue and digital systems are space diversity (SD) and frequency diversity (FD). Also, angle diversity (AD) has found increasing interest for radio-relay due to its main advantages: need of one Rx-antenna only, and no waste of frequency band... View full abstract»

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  • Optimum hop length for millimeteric wave radio links in arid land climate

    Publication Year: 1993, Page(s):181 - 186
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (348 KB)

    Reliability analysis of millimetric wave radio links operating in an arid climate are presented and used to derive the hop length versus fade margin charts. Long term rain and visibility data for Saudi Arabia, are used to determine rain and visibility statistics for various regions of the country. Based on the results of measured attenuation at 40 GHz in Riyadh, meteorological statistics are conve... View full abstract»

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  • Assessments of the impact of CCITT G.826 Recommendation on radio relay system design and radio link deployments

    Publication Year: 1993, Page(s):15 - 20
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (340 KB)

    The paper presents an analysis of the impact of the new CCITT Rec. G.826 on digital radio transmission. In this respect, it appears quite important to define suitable allocation criteria and the paper depicts two possible allocation rules. It is confirmed that the new quality objectives are all more stringent that the G.821 corresponding ones. Radio systems' technological evolution, however, can a... View full abstract»

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  • 2nd generation of millimetre-wave point-to-point digital systems

    Publication Year: 1993, Page(s):307 - 310
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (188 KB)

    Until now, UK has been the primary market for millimetre-wave point-to-point digital links, corresponding to a first generation of systems. At present, the millimetre-wave market is enlarging its borders to other European countries while evolving. The market evolution is analysed together with the evolution of the corresponding technology. The analysis leads to the identification of new features a... View full abstract»

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  • Experimental results from a 70 Mbit/s-16 QAM 229 km oversea radio link in Italy

    Publication Year: 1993, Page(s):198 - 203
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (356 KB)

    The paper reports the experimental results obtained during a first trial period, September 1992 to July 1993, for a digital radio-relay link over the Mediterranean sea between Sardinia and the Continent in Italy. In order to achieve the required level of performance the system configuration was designed to use space (with in-phase maximum power combiners, IPMAP) and frequency diversities with thre... View full abstract»

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  • Multicarrier modulation technique for wireless local area networks

    Publication Year: 1993, Page(s):33 - 38
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (260 KB)

    The paper proposes the multicarrier modulation/differential detection technique for wireless local area networks. One computationally efficient closed form expression for the bit error rate in a frequency- and time-selective Rayleigh fading channel is derived, and numerical results to show the BER performance in a practical indoor wireless channel are demonstrated View full abstract»

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  • A single chip adaptive QAM processor for data rates up to 500 Mbit/s

    Publication Year: 1993, Page(s):227 - 233
    Cited by:  Papers (3)  |  Patents (3)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (428 KB)

    The miniaturization of CMOS structures allows the realization of a complex-valued adaptive time domain equalizer at a symbol rate of 30 MHz on one VLSI chip by using the `application specific' gate array technique (ASICs). By making use of a full custom design and CMOS technology it was possible to integrate on one chip not only an entire complex-valued baseband transversal equalizer but also all ... View full abstract»

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  • Technical and economic assessment on radio relay systems in the local and distribution Italian networks

    Publication Year: 1993, Page(s):84 - 89
    Cited by:  Patents (4)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (392 KB)

    Presents a technical and economic assessment on digital radio relay systems (DRRSs) for the Italian local and distribution network. The authors summarize the evolution trends for the Italian local and distribution network, outlining the modification of network structure to understand the possible application field of DRRSs. They deal with the role of the DRRSs for the introduction of SDH systems a... View full abstract»

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  • TMN aspects regarding radio relay systems for SDH and PDH signals

    Publication Year: 1993, Page(s):148 - 153
    Cited by:  Patents (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (268 KB)

    For SDH transmission equipment a TMN system is nearly mandatory. Thereby it is indispensable that all equipment concerned is managed by a common TMN system. Transmission equipment for that are add drop multiplexers (ADMX), fibre optic (FO)- and radio transmission systems for SDH signals. But also existing PDH equipment should be included into TMN as far as possible. Some aspects of a QD2-applicati... View full abstract»

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  • Millimetric wave systems-the attractive access radio solution

    Publication Year: 1993, Page(s):287 - 295
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (460 KB)

    Considers millimetric systems to be those operating above 20 GHz which coincides with the definition used by ETSI for ETS specification activities. The work by ETSI at present covers the 20-60 GHz range with transmission rates from 2-155 Mbit/s. The paper also examines the likely applications for millimetric links, the propagation differences not normally considered in lower frequency bands to be ... View full abstract»

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  • A compact BCM modem implementation for SDH access radio

    Publication Year: 1993, Page(s):267 - 272
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (348 KB)

    The SDH access radio network calls today for a modem that is properly implemented. Neither the simplicity of a 4-PSK modem, nor the sophisticated multilevel high capacity modems with their expensive power consumption are suitable. The authors think that the compactness, the low power consumption, the right spectrum efficiency associated with a good receiver sensitivity and consequently a low cost ... View full abstract»

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  • First results of the 16/64 QAM XPIC trial in the Netherlands

    Publication Year: 1993, Page(s):187 - 192
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (308 KB)

    A description of a 16/64 QAM XPIC trial in the Netherlands is given. Two 16/64 QAM co-channel pairs, one of which is equipped with XPICs, are monitored to obtain the performance improvement by XPICs. From measurements over two years it follows that a reduction in outage time (BER greater than 10-3) of approximately 2 to 4 can be obtained for both 16 and 64 QAM modulation. XPICs also red... View full abstract»

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  • Implications of draft new ITU-T Recommendation G.826 on digital radio-relay systems

    Publication Year: 1993, Page(s):21 - 28
    Cited by:  Papers (1)  |  Patents (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (228 KB)

    Draft new ITU-T Recommendation G.826 specifies error performance parameters and objectives for international digital paths at or above the primary rate. These paths may be based on a PDH, SDH or some other transport network. Future radio-relay systems, which will form part of these paths have to comply with this recommendation. The present paper analyzes the new concepts introduced in G.826 and ap... View full abstract»

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  • Planar sector-beam antenna for point to multipoint systems around and above 10 GHz

    Publication Year: 1993, Page(s):73 - 78
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (224 KB)

    After justifying the choice of radiation pattern for an antenna dedicated to point to multipoint systems above 10 GHz, the article describes the design of such an antenna working at 23 GHz. Planar printed antennas are discussed View full abstract»

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  • Video transmission using millimetre wave radio systems

    Publication Year: 1993, Page(s):311 - 315
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (244 KB)

    The development of a video distribution system in the 28 GHz band by BT started in 1986 to meet the demand for a radio system that could provide the final link to customers to make available a satellite service where customers could not have direct satellite reception for a number of reasons. Subsequently the system has been adapted to also provide point-to-point closed circuit TV applications. At... View full abstract»

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  • Propagation on 23, 31 and 50 GHz line-of-sight over-water paths

    Publication Year: 1993, Page(s):355 - 360
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (288 KB)

    Propagation investigations have been performed during a period of three years (1988-1990) on the east coast of Sweden. The primary purpose of the measurements was to establish the limitations in availability caused by fading due to rain, snow, multipath propagation, hail and fog. Prediction models (CCIR) for rain and multipath fading have been adapted, monthly and annually, to experimental cumulat... View full abstract»

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