VTC2000-Spring. 2000 IEEE 51st Vehicular Technology Conference Proceedings (Cat. No.00CH37026)

15-18 May 2000

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  • 2000 IEEE 51st vehicular technology conference proceedings [front matter]

    Publication Year: 2000, Page(s):i - xlvi
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  • Author index

    Publication Year: 2000, Page(s):xlvii - lvi
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  • PDF-transformation for the outdoor-indoor propagation model

    Publication Year: 2000, Page(s):1646 - 1650 vol.3
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (400 KB)

    The main objective of this work is to provide the probability transformation for the parameters describing an impinging wave from the outdoor to the indoor environment. An approximated deterministic outdoor-indoor model already developed is utilised to extract the probability density function (PDF) transformation rule for the delay, azimuth and elevation spectra. Since the interface model is appli... View full abstract»

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  • Performance analysis of handoff algorithm in fiber-optic microcell/picocell radio system

    Publication Year: 2000, Page(s):2408 - 2412 vol.3
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (360 KB)

    The fiber-optic radio system was proposed to solve the cost problem of micro/picocell system. In this system, all channel elements in a system can be dynamically assigned when the SDS is used. We analyzed the performance of soft handoff used as intergroup handoff in the CDMA based fiber-optic cellular system with a spectrum delivery switch (SDS). Performance is evaluated in view of blocking and ha... View full abstract»

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  • Coherent multicarrier/DS-CDMA and MC-CDMA for broadband packet wireless access

    Publication Year: 2000, Page(s):1918 - 1922 vol.3
    Cited by:  Papers (19)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (424 KB)

    This paper compares the packet error rate (PER) performance levels of 3 access schemes, i.e., single-carrier (SC)/DS-CDMA, multi-carrier (MC)/DS-CDMA, and MC-CDMA assuming an over 100-MHz bandwidth for broadband packet wireless access. In a broadband propagation channel, severe multipath interference degrades the accuracy of path search and channel estimation for coherent detection. Computer simul... View full abstract»

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  • Wideband channel sounding dynamic range using a sliding correlator

    Publication Year: 2000, Page(s):2517 - 2521 vol.3
    Cited by:  Papers (10)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (344 KB)

    The sliding correlator is widely used in channel sounders employed to measure the impulse response of the radio channel. Cross-correlation of two pseudonoise (PN) sequences with slightly different chip rates gives the channel impulse response. However, the slight difference in chip rates creates various distortions in the cross-correlation response, compared with the autocorrelation function of th... View full abstract»

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  • MLSE and equalization of space-time coded signals

    Publication Year: 2000, Page(s):1688 - 1693 vol.3
    Cited by:  Papers (19)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (484 KB)

    Diversity transmission at the base station is an effective technique to combat adverse effects of fading. This is suggested as an alternative to diversity at the terminal, thereby reducing the implementation complexity. Space-time coding has been proposed as a coding technique for diversity transmission that will provide additional performance gains. We describe a maximum likelihood sequence estim... View full abstract»

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  • Performance of space-time processing for ISI- and CCI-suppression in industrial scenarios

    Publication Year: 2000, Page(s):1894 - 1898 vol.3
    Cited by:  Papers (12)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (588 KB)

    This paper shows simulation results of the performance of linear and decision-feedback space-time equalizers for a single carrier system with 24 Msym/s data rate at 5.2 GHz carrier frequency. Thereby the radio channel is realistically modeled by using measurement data of a vector channel sounder gathered in two industrial scenarios. A comparison is given for a variety of equalizer complexities, va... View full abstract»

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  • Combined coding and spreading in downlink CDMA systems

    Publication Year: 2000, Page(s):2403 - 2407 vol.3
    Cited by:  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (404 KB)

    Changing from orthogonal spreading codes in a direct-sequence CDMA (DS-CDMA) system to more powerful forward error correcting convolutional codes is proven superior in an asynchronous uplink system. This approach is referred to as code-spread CDMA (CS-CDMA). In this paper these two systems are compared in a synchronous downlink scenario. Both systems are assumed to operate over channels with nonze... View full abstract»

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  • Reduced complexity PTS and new phase sequences for SLM to reduce PAP of an OFDM signal

    Publication Year: 2000, Page(s):1914 - 1917 vol.3
    Cited by:  Papers (20)  |  Patents (18)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (272 KB)

    This paper presents a simplified version of partial transmit sequences (PTS) and a new scheme for selected mapping sequences to reduce peak-to-average power ratio (PAP) of an OFDM signal. Simplification of PTS is achieved by having a set of partitions but optimizing phase values only for alternate partitions. This proves to be a promising solution to reduce complexity of PTS. It is also proposed t... View full abstract»

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  • A comparison of narrowband and broadband overlay of cellular CDMA on GSM

    Publication Year: 2000, Page(s):1859 - 1863 vol.3
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (344 KB)

    A comparison of narrowband and broadband overlay of cellular CDMA system on a GSM system from the viewpoint of capacity is carried out. As a narrowband overlay the IS-95 system is adopted. By a specific way of setting up a CDMA channel one can find the average power of interference in the GSM system caused by both narrowband and broadband CDMA overlay and vice versa. The interference power enables... View full abstract»

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  • Variable chip rate CDMA

    Publication Year: 2000, Page(s):2267 - 2271 vol.3
    Cited by:  Papers (3)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (404 KB)

    A direct-sequence spread spectrum multiple access scheme called variable chip rate code-division multiple access (VCR-CDMA) is presented. The scheme supports different information bearing data rates for users or devices accessing various multimedia applications by varying the transmission (chip) rates and overlaying the frequency spectra of channels with different data rates. This scheme is applic... View full abstract»

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  • Cellular network capacity planning using the combination algorithm for total optimisation

    Publication Year: 2000, Page(s):2512 - 2516 vol.3
    Cited by:  Papers (9)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (520 KB)

    The combination algorithm for total optimisation (CAT) is proposed to support smooth upgrading of third generation systems and to fulfil the requirements of current cellular networks. The CAT algorithm solves the problem of base-station location in different environments. Until now experiments were based on simple statistical propagation models such as Okumura-Hata. In this paper new results based... View full abstract»

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  • Automatic classification of QAM signals in fading channel

    Publication Year: 2000, Page(s):1717 - 1721 vol.3
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (340 KB)

    In this paper, automatic classification algorithm of QAM signals proposed in the past is discussed and improved from a practical view point. The classification algorithm is based on the log-likelihood function which represents the probability density of the QAM signal amplitude under a multipath fading channel. The performance of classification algorithm is evaluated by computer simulations, and t... View full abstract»

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  • 10 mbit/s CFO-SS (carrier frequency offset-spread spectrum) system using 2.4 GHz ISM band

    Publication Year: 2000, Page(s):1840 - 1844 vol.3
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (448 KB)

    The design of wireless communications systems with a transmission rate of 10 Mbit/s is presented for the 2.4 GHz Japanese ISM band, in which a spread spectrum technique named “CFO-SS” scheme is employed. In the CFO-SS system, a single PN code is commonly assigned to all the synchronized multiplexed carriers, and the frequency separation between carriers is determined by the transmissio... View full abstract»

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  • Performance of variable rate bit interleaved coding for high bandwidth efficiency

    Publication Year: 2000, Page(s):2054 - 2058 vol.3
    Cited by:  Papers (18)  |  Patents (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (372 KB)

    We propose a bandwidth efficient error correction scheme, namely the variable rate adaptive bit-interleaved coded modulation (ABICM), for wireless mobile channel. The code rate and modulation level are varied according to the current channel state to exploit the time-varying nature of the wireless channel. Design challenges to achieve symbol-by-symbol adaptation and component codes design are addr... View full abstract»

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  • A new spatio-temporal equalization method using estimated channel impulse response

    Publication Year: 2000, Page(s):2477 - 2481 vol.3
    Cited by:  Patents (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (416 KB)

    This paper proposes a new spatio-temporal equalization method, which utilizes an adaptive antenna array and a decision feedback equalizer (DFE) simultaneously. In the design of a spatio-temporal equalizer, how to split equalization functionality into a spatial equalizer and a temporal equalizer plays an important role to achieve effective equalization. Since the performance of a spatial equalizer ... View full abstract»

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  • Performance analysis of a CDMA network with mixed traffic using unequal power control

    Publication Year: 2000, Page(s):1683 - 1687 vol.3
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (328 KB)

    This paper considers the effect of unequal power control in direct sequence CDMA cellular networks in the reverse direction to achieve differentiated quality of service. In particular, power control can be used to maintain the required Eb/I0 for a given type of traffic to meet the desired service quality. Here, an analytical approach is used to determine the probability of ou... View full abstract»

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  • An adaptive predistortion method for linear power amplifiers

    Publication Year: 2000, Page(s):1889 - 1893 vol.3
    Cited by:  Papers (13)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (292 KB)

    A basestation power amplifier requires high linearity and stable operation for common amplication of a multiplexed wideband signal. Nonlinearity compensation techniques with feedforward or a predistorter are useful for this purpose. This paper presents a predistortion amplifier with automatic control at RF band for application at a basestation. In this method, the predistorter distorts an RF input... View full abstract»

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  • A systolic array RLS processor

    Publication Year: 2000, Page(s):2247 - 2251 vol.3
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (412 KB)

    This paper describes the outline of the systolic array recursive least-squares (RLS) processor that we developed primarily with the aim of broadband mobile communication applications. To perform the RLS algorithm effectively, this processor uses an orthogonal triangularization technique known in matrix algebra as QR decomposition for parallel pipelined processing. The processor board is comprised ... View full abstract»

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  • Distributed local loop configuration of array antenna for CDMA cellular base station

    Publication Year: 2000, Page(s):2398 - 2402 vol.3
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (348 KB)

    We have designed a new type of CDMA array antenna with distributed processing using a local loop data transmission system over its sub-array antenna components. We have assembled a prototype array antenna. Outdoor equipment is covered by a conformal arrangement of sub-array elements on an 18th surface polygon structure. Transmitter and receiver components are located inside of the 18th polygon at ... View full abstract»

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  • Spatio-temporal channel models for the mobile station: concept, parameters, and canonical implementation

    Publication Year: 2000, Page(s):1641 - 1645 vol.3
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (440 KB)

    We treat spatio-temporal channel models for the mobile station in cellular communication systems. The well-known model of wide-sense stationary uncorrelated scattering is extended for the perspective of a vehicular antenna array. We define a delay-pattern-time-space-correlation function and find a closed-form for it for any given wave incidence profile, array geometry, antenna gain patterns, and m... View full abstract»

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  • Wavelet packet functions based coded MC-CDMA system and its performance

    Publication Year: 2000, Page(s):1933 - 1937 vol.3
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (316 KB)

    A new scheme of coded orthogonal multicarrier CDMA based on wavelet packet functions is proposed in this paper. Properties of wavelet packet functions ensure that the system can suppress multi-path interference, inter-subchannel interference (ICI) and multiple access interference (MAI) effectively. The error control code technique is used to enhance the system performance. The system performance i... View full abstract»

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  • A LINC transmitter using a new signal component separator architecture

    Publication Year: 2000, Page(s):1909 - 1913 vol.3
    Cited by:  Papers (4)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (388 KB)

    The LINC (LInear amplification with Nonlinear Components) transmitter is an architecture that provides linear amplification using nonlinear but power efficient amplifiers. The signal component separator (SCS) is a crucial signal processing function of LINC. DSP implementation of the SCS at baseband has so far been assumed to be the best choice although it suffers from matching and power consumptio... View full abstract»

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  • Data throughput of CDMA-HDR a high efficiency-high data rate personal communication wireless system

    Publication Year: 2000, Page(s):1854 - 1858 vol.3
    Cited by:  Papers (661)  |  Patents (86)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (340 KB)

    Forward link data throughput performance of a high data rate wireless access system is presented. On the forward link of the proposed system data is transmitted to different access terminals (AT) in a TDM fashion. The rate transmitted to each AT is variable and depends on each AT's measured SINR. ATs send to the access points (AP) the index of the highest data rate which can be received reliably. ... View full abstract»

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