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  • Articles  (13)
  • HIPERLAN  (13)
  • Springer  (13)
  • National Academy of Sciences
  • 2015-2019
  • 1995-1999  (13)
  • 1975-1979
  • Electrical Engineering, Measurement and Control Technology  (13)
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  • Articles  (13)
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Keywords
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  • Springer  (13)
  • National Academy of Sciences
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  • Electrical Engineering, Measurement and Control Technology  (13)
  • 1
    Electronic Resource
    Electronic Resource
    A patch antenna for HIPERLAN (1996)
    Springer
    Wireless personal communications 3 (1996), S. 389-396 
    Details
    ISSN: 1572-834X
    Keywords: Patch antenna ; wireless LANs ; HIPERLAN
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology
    Notes: Abstract A patch antenna suited for indoor HIPERLAN is presented. The antenna operates in T M 02 mode and its radiation pattern is omnidirectional in azimuth and has a null in the normal direction. An experimental prototype has been designed and tested. A 6.1% bandwidth of VSWR≤2 and 4.2 dB antenna gain were measured at 5 GHz band.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00461147
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  • 2
    Electronic Resource
    Electronic Resource
    A discussion of some of the issues facing the regulator in dealing with the newly developing nomadic services including HIPERLAN (1996)
    Springer
    Wireless personal communications 3 (1996), S. 347-351 
    Details
    ISSN: 1572-834X
    Keywords: Radio ; HIPERLAN ; computer ; 5 GHz ; 17 GHz ; spectrum management ; frequency allocation ; nomad ; nomadic ; ad hoc network ; peer to peer network ; licensing ; hubless ; CEPT ; ETSI ; RES-10
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology
    Notes: Abstract HIPERLAN is a new standard for nomadic computer equipment being developed by ETSI. The practicalities of licensing of such computer networks make it unlikely that there will be an individual licensing scheme. Nomadic equipment cannot be restricted to certain regions or countries. There are clear indications that it will play an increasingly large role in communications. The best solution to the issue of nomadic equipment and its future development would appear to be an international effort at spectrum planning and frequency allocation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00461144
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  • 3
    Electronic Resource
    Electronic Resource
    Predicted HIPERLAN coverage and Outage performance at 5.2 and 17 GHz using indoor 3-D ray-tracing techniques (1996)
    Springer
    Wireless personal communications 3 (1996), S. 365-388 
    Details
    ISSN: 1572-834X
    Keywords: HIPERLAN ; ray tracing ; equalisation ; propagation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology
    Notes: Abstract The European Telecommunications Standards Institute (ETSI) has recently defined a European standard for High Performance Radio LANs. This standard, known as HIPERLAN, has dedicated spectrum in both the 5 GHz and 17 GHz frequency bands. The system has been designed as an indoor wired-line replacement offering raw data rates in excess of 20 Mb/s. In this paper, simulated propagation data at 5.2 GHz and 17 GHz has been generated for a typical HIPERLAN environment. The analysis was performed using an indoor three dimensional ‘ray-tracing’ algorithm developed for site specific single floor environments. The model is capable of predicting narrowband (power) and wideband (time dispersion) characteristics even in non-line-of-sight locations. Using this propagation information, the design of a suitable equaliser and the expected coverage of a HIPERLAN node is investigated for a particular indoor location. Emphasis has been placed on the need to develop low cost and robust receiver designs that are compatible with the design goal of a small and low power terminal.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00461146
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  • 4
    Electronic Resource
    Electronic Resource
    Performance of the EY-NPMA Protocol (1997)
    Springer
    Wireless personal communications 4 (1997), S. 41-50 
    Details
    ISSN: 1572-834X
    Keywords: Wireless LANs ; HIPERLAN ; MAC protocol ; hidden nodes
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology
    Notes: Abstract The throughput of the Elimination Yield Non-pre-emptive Priority Multiple Access (EY-NPMA) protocol, which has been chosen as the medium access control (MAC) protocol for HIPERLAN, is simulated. Connection between users is based on a statistical model of path loss with power law against distance and 6 dB log-normal shadowing. It is shown that the throughput performance of the EY-NPMA protocol in networks of moderate size and with small proportion of hidden nodes is satisfactory. For a fully connected network, the throughput reaches 0.85 at an offered traffic of 1 and remains at this level. The maximum throughput reduces gradually when the number of hidden node pairs in the network is increased. With 11% of hidden nodes in the network the peak throughput falls to 0.6.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1008842203886
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  • 5
    Electronic Resource
    Electronic Resource
    Increasing Reliability in Cable-Free Radio LANs Low Level Forwarding in HIPERLAN (1997)
    Springer
    Wireless personal communications 4 (1997), S. 51-63 
    Details
    ISSN: 1572-834X
    Keywords: HIPERLAN ; topology connectivity ; reliability ; forwarding ; hop-by-hop routing
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology
    Notes: Abstract Radio LANs are emerging in the computing world. They are supported by distinct configurations: on the one hand radio LANs with base stations and a wired backbone, on the other hand radio LANs implementing Intra-forwarding. Adding a new node in a radio LAN with Intra-forwarding, increases the reliability, while this reliability decreases with ad hoc or hub configurations. This advantage of Intra-forwarding is quantified. Intra-forwarding, as defined in the HIPERLAN standard, is based on a hop-by-hop policy and link check procedures. It is shown how point-to-point packets and broadcast packets are forwarded. The three basic components of Intra-forwarding needed to build and update the Intra-forwarding database are described. The originality of this approach is the use of multipoint relays which enable better scalability. The correctness of the Intra-forwarding protocol is proved and its cost is evaluated.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1008861218989
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  • 6
    Electronic Resource
    Electronic Resource
    Comparative indoor RF channel soundings at 2, 5 & 17 GHz (1996)
    Springer
    Wireless personal communications 3 (1996), S. 353-363 
    Details
    ISSN: 1572-834X
    Keywords: HIPERLAN ; LAN ; delay spread ; channel sounding ; indoor radio propagation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology
    Notes: Abstract There is a relatively large selection of results for indoor channel soundings at frequencies around 1 to 2 GHz but relatively few at the HIPERLAN frequencies of 5 and 17 GHz. This work provides some results taken at all three frequencies in order to redress this deficiency and also to compare results at these frequencies. A 20 GHz network analyser was used to perform the soundings. The analyser was capable of performing the Chirp Z transform to convert complex frequency response data to the time domain. Soundings were made in the Agency's office headquarters at Waterloo London and in their investigation facility at Whyteleafe. These two locations provided some diversity of sounding environments involving small offices, meeting rooms and large laboratories. Both buildings were of a 1930's style brick construction with some modern plaster board internal walls. Decay exponents and delay spreads are given for the test frequencies. Results show similar delay spreads at all frequencies.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00461145
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  • 7
    Electronic Resource
    Electronic Resource
    Co-channel and self-interference analysis for indoor wireless channels (1996)
    Springer
    Wireless personal communications 3 (1996), S. 411-419 
    Details
    ISSN: 1572-834X
    Keywords: Co-channel interference ; self-interference outage ; HIPERLAN ; indoor wireless systems
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology
    Notes: Abstract To achieve a user data rate of 20 Mbit/s in the high performance local area network (HIPERLAN) system operating in indoor environments, channel equalization must be used to mitigate the effects of multipath propagation. If, however, the indoor channel impulse response length is too long, then the multipath power outside of the equalisation capability of the equalizer acts as a form of self interference. Moreover, co-channel interference may also be present at the detector input. Considering these two effects as well as the rms delay spread, this paper derives analytical expressions for the probability of outage.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00461149
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  • 8
    Electronic Resource
    Electronic Resource
    Signal processing hardware in a radio LAN demonstrator (1996)
    Springer
    Wireless personal communications 3 (1996), S. 429-443 
    Details
    ISSN: 1572-834X
    Keywords: HIPERLAN ; radio LANs ; equalisation ; DFE
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology
    Notes: Abstract In order to demonstrate the practicality of high speed radio LANs, such as HIPERLAN, a hardware demonstrator has been built. To overcome the inter-symbol interference caused by the dispersive nature of the indoor radio channel, a decision feedback equaliser has been included in the system. No central synchronisation is provided in a network and a node must be able to derive all synchronisation from a received packet. This paper describes all of the signal processing hardware built for the demonstrator. The demonstrator is not standards compliant but the physical layer parameters are very similar and the signal processing required in HIPERLAN equipment will be very similar to that in the demonstrator.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00461151
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  • 9
    Electronic Resource
    Electronic Resource
    Analysis and optimisation of the HIPERLAN Channel Access Contention Scheme (1997)
    Springer
    Wireless personal communications 4 (1997), S. 27-39 
    Details
    ISSN: 1572-834X
    Keywords: HIPERLAN ; elimination phase ; yield phase probability of collision
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology
    Notes: Abstract This paper analyses the HIPERLAN channel access mechanism. Both a purely mathematical and a simulation model are built in order to evaluate the two successive phases of the contention scheme. Several optimisations, based on the choice of parametric values, are proposed, evaluated and compared.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1008879128290
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  • 10
    Electronic Resource
    Electronic Resource
    Synchronisation Techniques for HIPERLAN (1997)
    Springer
    Wireless personal communications 4 (1997), S. 1-10 
    Details
    ISSN: 1572-834X
    Keywords: Wireless LANs ; HIPERLAN ; synchronisation ; genetic algorithm ; matched filter
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology
    Notes: Abstract Timing recovery in the High Performance Radio Local Area Network (HIPERLAN) standard is likely to be performed with the aid of synchronisation sequences embedded in the user data, which will be detected with matched filters. A directed search using a form of genetic algorithm has been performed to obtain suitable sequences of lengths up to 80 bits, and simulations of their performance have been undertaken. Performance of the sequences has been measured under the severe channel conditions that pertain in the indoor environment.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1008868415793
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  • 11
    Electronic Resource
    Electronic Resource
    Data Transfer for HIPERLAN (1997)
    Springer
    Wireless personal communications 4 (1997), S. 65-80 
    Details
    ISSN: 1572-834X
    Keywords: HIPERLAN ; data transfer ; time bounded services ; QoS parameters ; access priority scheme ; deadline ; Earliest Deadline First algorithm (EDF)
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology
    Notes: Abstract HIPERLAN offers a high speed (23.5 Mbit/s) radio LAN and therefore HIPERLAN is likely to support various kinds of traffic requirements. A Data Transfer function is in charge of handling various traffics which can result in simultaneous services. HIPERLAN nodes are not necessarily within direct radio range; and in some cases packets are forwarded by intermediate stations from the source node to the destination node. Since HIPERLAN is more than a single hop network, the support of specific traffics like Time Bounded traffics require a dedicated architecture which can not be centralized. This paper describes the architecture of the Data Transfer in HIPERLAN which allows the support of various traffics. This approach is not based on a connection oriented protocol nor on a centralized architecture but on a connection-less mode where users provide quality of services parameters to indicate its requirements. HIPERLAN architecture for data transfer is based on a mix of two main mechanisms: hierarchically independent priority levels and an earliest dead line first algorithm. This paper describes and explains the architecture choices made in HIPERLAN. Results of simulation and analytical models are given.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1008867232482
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  • 12
    Electronic Resource
    Electronic Resource
    Toward Wireless Multimedia Communications. Current Standards and Future Directions (1998)
    Springer
    International journal of wireless information networks 5 (1998), S. 61-73 
    Details
    ISSN: 1572-8129
    Keywords: WIRELESS ATM ; HIPERLAN ; 802.11 ; GSM ; DECT
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology
    Notes: Abstract There are two major trends in communicationstechnology: multimedia and mobile communications. Thisis necessary to support new service concepts anddemanding capabilities of wireless communicationsystems. Although the migration to ATM-based broadbandISDN is visible, wireless ATM (WATM) internetworking formobile clients is still in its infancy. In this article,a brief overview of the current mobile communications standards GSM and DECT is presented. It isshown why these standards fail to deliver adequateperformance for multimedia data transfer. We thendescribe the recently approved IEEE 802.11 wirelesslocal area network standards and ETSI HIPERLAN 1 indetail and discuss their suitability for the transfer ofATM cells. Next, the ongoing work of the ATM Forum'sWATM Working Group and the efforts of the ETSI RES 10 regarding the further development ofHIPERLAN 2, 3, and 4 is elaborated. Finally, severalexisting WATMs are described.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1018840713290
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  • 13
    Electronic Resource
    Electronic Resource
    Modulation and Equalisation Considerations for High Performance Radio LANs (1997)
    Springer
    Wireless personal communications 5 (1997), S. 131-154 
    Details
    ISSN: 1572-834X
    Keywords: HIPERLAN ; radioLAN ; modulation ; equalisation.
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology
    Notes: Abstract The European Telecommunications Standards Institute (ETSI) has recently defined a European standard for a high performance radio LAN (known as HIPERLAN). To operate as wired LAN replacements, these systems will operate at 5.2 GHz and support instantaneous bit rates of just under 24 Mb/s. To counteract the time dispersive nature of the indoor radio channel, the use of adaptive equalisation is suggested. In this paper a number of possible modulation and equalisation techniques are presented and, in particular, the Bit Error Rate (BER) performance of quasi-coherent GMSK combined with Decision Feedback Equalisation is explored through computer simulation. The trade off between symbol spaced and fractionally spaced equalisation is considered together with the importance of feedfoward and feedback synchronisation to the channel's power delay profile. The paper also includes a comparison of the RLS and LMS based training algorithms and compares the modem developed under the ESPRIT III LAURA project with that specified in HIPERLAN. The application of dual antenna diversity is investigated and its impact on the number of received error free data packets obtained as a function of signal leval and rms delay spread. The use of such diversity is shown to greatly improve the BER performance of a HIPERLAN modem. The problem of frequency offset is considered and modifications are proposed to the HIPERLAN frame structure to improve the receiver's tolerance to such errors. Important practical issues such as frame and symbol synchronisation, frequency offset correction and hardware implementation are discussed from both the LAURA and HIPERLAN viewpoint.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1008889026882
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