Third International Conference on 3G Mobile Communication Technologies

8-10 May 2002

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Displaying Results 1 - 25 of 112
  • A novel channel estimation algorithm applied to UTRA-FDD

    Publication Year: 2002, Page(s):267 - 271
    Cited by:  Papers (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract |PDF file iconPDF (414 KB)

    Channel estimation is a key step in the initial synchronisation of a RAKE receiver. In this paper we present an algorithm for multipath channel estimation based on an elegant and efficient new technique for resolving the multipath components. The performance of the algorithm is assessed through simulation as part of a RAKE receiver in a fully compliant UTRA-FDD uplink scenario. Test results are pr... View full abstract»

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  • Orthogonality of UMTS codes in indoor channels

    Publication Year: 2002, Page(s):151 - 155
    IEEE is not the copyright holder of this material | Click to expandAbstract |PDF file iconPDF (491 KB)

    UMTS (Universal Mobile Telecommunications System) spreading codes are only truly orthogonal in the absence of multipath delay and time offsets. In all practical channels the loss of orthogonality will result in the generation of non-zero cross-correlation products that can compromise the error performance of code division multiple access (CDMA) systems. The practical level of cross-correlation pro... View full abstract»

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  • Implementation of an improved reconfigurable SOVA/log-MAP turbo decoder in 3GPP

    Publication Year: 2002, Page(s):146 - 150
    Cited by:  Papers (6)
    IEEE is not the copyright holder of this material | Click to expandAbstract |PDF file iconPDF (762 KB)

    SOVA (soft-output Viterbi algorithm) and log-MAP turbo decoding algorithms share common operations, making feasible a reconfigurable SOVA/log-MAP turbo decoder for reduced power consumption. We show that the improved reconfigurable SOVA/log-MAP turbo decoder is suitable for implementation in 3GPP systems. Simulations of turbo coding and decoding have been done using the parameters of 3GPP with AWG... View full abstract»

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  • Spatio-temporal investigation of UTRA FDD channels

    Publication Year: 2002, Page(s):175 - 179
    Cited by:  Papers (9)
    IEEE is not the copyright holder of this material | Click to expandAbstract |PDF file iconPDF (601 KB)

    Smart antennas promise to provide range extension and capacity enhancements crucial to the successful deployment of Universal Mobile Telecommunications System (UMTS) networks. The frequency offset between the uplink and downlink in the frequency division duplex (FDD) air interface gives rise to a frequency dependency in the channel responses and potential problems in downlink beamforming. In order... View full abstract»

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  • Zero correlation zone sequences for multi-carrier DS-CDMA systems

    Publication Year: 2002, Page(s):141 - 145
    IEEE is not the copyright holder of this material | Click to expandAbstract |PDF file iconPDF (527 KB)

    A multi-carrier DS-CDMA system is proposed that employs zero correlation zone (ZCZ) sequences as spreading sequences to reduce the multipath interference. Bit error rates (BER) and frame error rates (FER) for a range of Eb/N0 values are presented. It is demonstrated that the proposed scheme can improve the BER and FER performance, in the frequency selective fading channel eva... View full abstract»

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  • Link-level simulation of W-CDMA satellite-UMTS random access channel

    Publication Year: 2002, Page(s):170 - 174
    Cited by:  Papers (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract |PDF file iconPDF (521 KB)

    In this paper, link level simulation for the W-CDMA Satellite-UMTS RACH (radio access channel) has been presented. Simulation results show improvements in detection using a longer preamble with differential accumulation. For a longer preamble, coherent processing suffers large losses in the presence of Doppler. Efficient channel estimation algorithms and pre-Doppler compensation are required if a ... View full abstract»

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  • Downlink soft handover gain in UMTS networks under different power control conditions

    Publication Year: 2002, Page(s):47 - 51
    Cited by:  Papers (3)
    IEEE is not the copyright holder of this material | Click to expandAbstract |PDF file iconPDF (423 KB)

    The downlink soft handover gain is analysed in UMTS networks under three different power control situations: without power control, with perfect power control and with imperfect power control. The results show that although power control in the downlink direction is not as crucial as it in the uplink direction, it does have a significant influence on the downlink soft handover gain. The downlink s... View full abstract»

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  • On signalling issues for the high speed downlink packet access in UMTS

    Publication Year: 2002, Page(s):137 - 140
    Cited by:  Papers (1)  |  Patents (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract |PDF file iconPDF (471 KB)

    The high-speed downlink packet access (HSDPA) adopted in UMTS aims to support, integrated on the same carrier, voice on the dedicated channel (DCH) and high-speed data on the high-speed downlink shared channel (HS-DSCH). Taking account of some noticeable deficiencies in the system, the paper examines different signalling approaches for the HSDPA, based on a two-step signalling scheme. In this sche... View full abstract»

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  • Novel methods for enabling public key schemes in future mobile systems

    Publication Year: 2002, Page(s):455 - 458
    IEEE is not the copyright holder of this material | Click to expandAbstract |PDF file iconPDF (406 KB)

    It is essential to enable public key schemes in future mobile systems to solve current problems in authentication and key management for end-to-end security. We propose new procedures for enabling public key schemes in future mobile terminals. The proposed procedures are based on the complex public key computations that can be performed either in the SIM card or in the terminal itself Multiple cry... View full abstract»

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  • 3D facial animation for very low bit rate mobile video

    Publication Year: 2002, Page(s):371 - 375
    IEEE is not the copyright holder of this material | Click to expandAbstract |PDF file iconPDF (518 KB)

    Three-dimensional facial model coding can be employed in various mobile applications to provide an enhanced user experience. The potential for low bitrate and scalability that 3D coding provides, makes it suitable for use in conjunction with various mobile networks from GSM to UMTS. However, what is less clear is the sensitivity to channel errors of 3D coded data. The paper examines this issue in ... View full abstract»

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  • Implementation of COST259 channel models using tapped delay line for multiple antenna receivers

    Publication Year: 2002, Page(s):165 - 169
    Cited by:  Papers (3)
    IEEE is not the copyright holder of this material | Click to expandAbstract |PDF file iconPDF (541 KB)

    In this paper, the implementation of COST 259 channel models in macrocells, using a stochastic approach in terms of tapped delay line (TDL) models is presented. The implementation of this wideband channel is very important for link level simulation in future wireless systems that exploit space-time processing techniques using multiple antenna elements. Major channel effects are discussed and incor... View full abstract»

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  • Radio planning of third generation networks in urban areas

    Publication Year: 2002, Page(s):64 - 68
    Cited by:  Papers (3)
    IEEE is not the copyright holder of this material | Click to expandAbstract |PDF file iconPDF (550 KB)

    We examine some of the key issues facing radio network design engineers as they set about planning third generation networks in urban areas. 3G networks have one major difference compared with their second generation (2G) predecessors; they are designed to support data rates of up to 2 Mbit/s, and hence a much wider range of services. It also means that the task of designing and planning 3G networ... View full abstract»

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  • An open architecture mechanism for control of dynamic processing resources

    Publication Year: 2002, Page(s):469 - 473
    IEEE is not the copyright holder of this material | Click to expandAbstract |PDF file iconPDF (669 KB)

    The present need for high data rate communication applications and freedom to communicate from anywhere at any time demands more and more from digital processing hardware. The concept of software defined radio and reconfigurable networks requires many new mechanisms and subsystems to allow the implementation of such networks. The paper presents a solution to the problem of managing the configurati... View full abstract»

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  • Calculation of soft handoff gain for UMTS

    Publication Year: 2002, Page(s):42 - 46
    Cited by:  Papers (3)
    IEEE is not the copyright holder of this material | Click to expandAbstract |PDF file iconPDF (490 KB)

    Defining "soft handoff gain" is not as trivial as one might think. One reason is because the soft handoff in the uplink direction is different from that in the downlink direction. Another reason is the vague context of this gain. Is it the gain compared to a system without handoff altogether? Or is it the gain compared to a system lacking the softness of the handoff process? We define a frame of r... View full abstract»

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  • From 2G to 3G: a guide to mobile security

    Publication Year: 2002, Page(s):308 - 311
    IEEE is not the copyright holder of this material | Click to expandAbstract |PDF file iconPDF (511 KB)

    A close look at the ETSI (European Telecommunications Standards Institute). GSM standard shows that most of the security features were designed from an operator perspective with a view to preventing fraud and network misuse; the responsibility for implementing features related to user's privacy was delegated to the operators. This approach failed in providing a trusted environment where mobile use... View full abstract»

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  • Performance of space-time coding for 3GPP HSDPA service under flat and frequency selective fading conditions

    Publication Year: 2002, Page(s):133 - 136
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract |PDF file iconPDF (466 KB)

    There is little doubt that an important feature of third generation (3G) mobile systems is going to be the ability to send and receive large volumes of data at high speed. The Third Generation Partnership Project (3GPP) is currently considering suitable systems for high-speed downlink packet access (HSDPA) services to provide the required data throughput. One of the systems currently under conside... View full abstract»

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  • 3G interworking with wireless LANs

    Publication Year: 2002, Page(s):394 - 399
    Cited by:  Papers (4)  |  Patents (5)
    IEEE is not the copyright holder of this material | Click to expandAbstract |PDF file iconPDF (646 KB)

    Recently, the use of wireless LANs (WLAN) as a complementary technology to 3G systems has been identified. WLANs can be used to supplement the available bandwidth and capacity of a 3G network in hotspot areas, such as railway stations and airports, without sacrificing the capacity provided to cellular users. It provides support for data intensive applications and enables smooth on-line access to c... View full abstract»

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  • Performance of antenna hopping techniques for packet radio transmission

    Publication Year: 2002, Page(s):525 - 528
    IEEE is not the copyright holder of this material | Click to expandAbstract |PDF file iconPDF (425 KB)

    A transmission diversity scheme based upon antenna hopping is investigated for packet radio transmission for a typical urban environment. Our simulation results reveal that the gain obtained with antenna hopping at high speed is not significant. However, considerable gain is observed for low code rates such as CSI in GPRS, and MCS 5 and MCS 6 in EGPRS. View full abstract»

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  • Evolving beyond UMTS - the MIND research project

    Publication Year: 2002, Page(s):449 - 454
    IEEE is not the copyright holder of this material | Click to expandAbstract |PDF file iconPDF (670 KB)

    With the first commercial 3G systems nearing deployment and the standardisation of future UMTS releases well advanced, research has now started to map out the longer term evolution of mobile networks to extend and improve UMTS in more fundamental ways. The EU IST project MIND (and its predecessor BRAIN) have taken a wide ranging view of this subject, considering user applications, network architec... View full abstract»

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  • Personalised multimedia services for real-time video over 3G mobile networks

    Publication Year: 2002, Page(s):366 - 370
    Cited by:  Papers (4)  |  Patents (3)
    IEEE is not the copyright holder of this material | Click to expandAbstract |PDF file iconPDF (642 KB)

    Efficient distribution of rich multimedia content requires personalisation of media services to client device and bearer link properties. The customisation of multimedia data delivery is imposed by the vast amount of network heterogeneity and diverse user terminal capabilities. The paper discusses varied personalised communication strategies whilst introducing a proposed scheme. In this scenario, ... View full abstract»

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  • Micro-cell planning within macro-cells in UMTS: downlink analysis

    Publication Year: 2002, Page(s):211 - 215
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract |PDF file iconPDF (529 KB)

    The paper addresses the issue of hierarchical cell structure (HCS) planning using a single UMTS carrier. Using system-level simulations, analyses have been made of the coverage and capacity of 64 kbps circuit-switched services. Basic issues related to micro-cell planning and design, for example base station power outage and soft-handoff ratio, are studied. Simulation results on micro-cell downlink... View full abstract»

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  • WCDMA radio network planning for location services and system capacity

    Publication Year: 2002, Page(s):340 - 344
    Cited by:  Papers (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract |PDF file iconPDF (1222 KB)

    The majority of radio network planning processes being developed for WCDMA focus upon providing adequate coverage and capacity performance. These processes generally include the requirement to tune the CPICH physical channel such that sufficient power is assigned to provide coverage without assigning excessive power that would result in less power being available to user traffic. This paper studie... View full abstract»

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  • Secure software download for programmable mobile user equipment

    Publication Year: 2002, Page(s):505 - 510
    Cited by:  Papers (5)
    IEEE is not the copyright holder of this material | Click to expandAbstract |PDF file iconPDF (621 KB)

    At present, both symmetric and asymmetric cryptography have been proposed to provide secure software download. However, these approaches individually have some advantages and disadvantages. Asymmetric approaches are less efficient and more complex and require long key lengths to achieve the same level of security as the symmetric approach. On the other hand, the symmetric approach requires secret ... View full abstract»

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  • Modified non-coherent sequential acquisition scheme of DS/SS signals

    Publication Year: 2002, Page(s):160 - 164
    IEEE is not the copyright holder of this material | Click to expandAbstract |PDF file iconPDF (474 KB)

    The paper proposes a modified noncoherent sequential detection decision logic based on continuous accumulation in order to achieve fast PN code acquisition. In most reports on sequential schemes, the decision process is based on independent and identically distributed random variables, which requires the integrator to be reset periodically. This introduces loss in the effective signal-to-noise rat... View full abstract»

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  • Quantifying code orthogonality factor for UTRA-FDD down-links

    Publication Year: 2002, Page(s):185 - 190
    Cited by:  Papers (4)
    IEEE is not the copyright holder of this material | Click to expandAbstract |PDF file iconPDF (518 KB)

    The degradation of code orthogonality due to multi-path propagation has a direct impact on DS-CDMA system performance. A novel approach in deriving the orthogonality factor, which quantifies this degradation, is presented. Code orthogonality factors for realistic radio channels are calculated and the results analysed. The extension of the derivation to cover down-link beamforming investigates its ... View full abstract»

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