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5th IEEE International Symposium on Personal, Indoor and Mobile Radio Communications, Wireless Networks - Catching the Mobile Future.

18-23 Sept. 1994

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  • Wireless Networks - Catching the mobile future

    Publication Year: 1994
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  • Author index

    Publication Year: 1994
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  • Low bit-rate satellite demodulator implementation

    Publication Year: 1994, Page(s):1211 - 1214 vol.4
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (296 KB)

    In this paper we present the system design for a BPSK demodulator suitable for earth station implementation for satellite communications. The primary design goal has been to obtain a demodulator that has fast acquisition in a low signal-to-noise ratio environment. To this end the implementation uses structures and algorithms that are entirely feedforward. The system design has been analysed and ve... View full abstract»

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  • Mobility management in LEO/ICO satellite systems preliminary simulation results

    Publication Year: 1994, Page(s):1323 - 1329 vol.4
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (364 KB)

    Several proposals have been put forward to provide global handheld mobile communication based on a fleet of satellites in circular orbits: low Earth orbit (LEO ≈1000 km) and intermediate circular orbit (ICO >10000 km), each providing multispot coverage of the Earth surface. In these systems the satellite acts like a base station of the mobile ground cellular network, relaying data between mo... View full abstract»

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  • Collision resolution for handling mixed traffic on wireless networks with capture

    Publication Year: 1994, Page(s):1133 - 1137 vol.4
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (372 KB)

    We determine the performances of a collision resolution multiple access technique for handling speech and data traffic on a radio network with capture. The proposed access technique decouples the speech access procedure from the data access procedure. It follows that speech access performances do not depend on actual data load. It is well known that capture improves the performances of random acce... View full abstract»

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  • A multiple access protocol for integrated voice and high-speed data in wireless networks

    Publication Year: 1994, Page(s):1264 - 1270 vol.4
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (608 KB)

    An asynchronous multiple access protocol is presented for integrated voice/data communications in wireless networks, whereby the base station coordinates the uplink access of terminals within its cell with short controlling messages. Voice terminals are given access rights to the channel in a round-robin order, and transmit variable length packets to adapt to congestion. On the other hand, data te... View full abstract»

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  • A deterministic model for a shadowed Rayleigh land mobile radio channel

    Publication Year: 1994, Page(s):1202 - 1210 vol.4
    Cited by:  Papers (8)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (564 KB)

    In this paper a computer simulation model for a land mobile radio fading channel is presented. The model assumes non frequency-selective fading but takes into consideration the effects caused by shadowing. The simulation model is based on an efficient approximation of filtered white Gaussian noise by a finite sum of weighted sinusoids with equally distributed phases. Two completely different metho... View full abstract»

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  • Performance analysis of GMSK discriminator integrator detection with decision feedback equalization in land mobile radio channel

    Publication Year: 1994, Page(s):1317 - 1321 vol.4
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (352 KB)

    GMSK is an FM digital modulation of great interest in mobile communications because of its compact power spectrum and constant envelope property. Simple noncoherent detectors for reception of GMSK signal, as a limiter-discriminator or a limiter-discriminator followed by 1-bit or 2-bit integrate-and-dump postdetection filtering, are considered. The numerical and simulation results show that decisio... View full abstract»

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  • Comparison and verification of urban propagation models

    Publication Year: 1994, Page(s):1359 - 1363 vol.4
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (268 KB)

    The classical empirical field-strength prediction models like the model of Hata (1980) are used widely in mobile radio. However there is no experience in the building height distribution and land usage factor for most European cities. The Technical University of Budapest started a study to characterise the mobile propagation path in Budapest. The paper introduces the first results, showing the bui... View full abstract»

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  • A hybrid CDMA-FDMA indoor microcellular scenario

    Publication Year: 1994, Page(s):1305 - 1308 vol.4
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (228 KB)

    An indoor communication channel is characterised by large propagation losses, slow time variations, a multipath nature and fading. We present a new cellular concept for indoor communications. A concentric circular model is the basic cell structure which consists of two or three concentric zones, operating in different frequencies, under the CDMA environment. Each user of this CDMA system employs a... View full abstract»

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  • Antenna configuration measurements for DECT micro-cells

    Publication Year: 1994, Page(s):1075 - 1080 vol.4
    Cited by:  Papers (3)  |  Patents (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (592 KB)

    The paper shows results from DECT propagation measurements in an outdoor micro-cell environment. The potential performance gain by using planar directional antennas compared to dipole antennas is shown. Radio channel impairments such as fast-fading, time dispersion, corner diffraction loss, and interference in relation to DECT are discussed View full abstract»

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  • Effect of CDMA transmission on performance of wireless networks with stack algorithm for collision resolution

    Publication Year: 1994, Page(s):1129 - 1132 vol.4
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (340 KB)

    This paper evaluates the performance of a packet radio network employing code division multiple access and a stack algorithm to resolve message collisions. We investigate the effects of bandspreading assuming a fixed total system bandwidth. Although bandspreading with perfectly orthogonal signals enhances system capacity, it does not resolve the instability of ALOHA random access unless special me... View full abstract»

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  • Multiple access and spatial collision resolution for IVHS packet radio networks

    Publication Year: 1994, Page(s):1260 - 1263 vol.4
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (356 KB)

    The spectrum efficiency of cellular radio data networks is maximized by increasing the cell throughput and decreasing the cluster sizes. However, smaller cluster sizes lead to higher cochannel interference and hence lower throughput. A multiple access and collision resolution scheme that accounts for the spatial aspects of cochannel interference is introduced and analyzed for roadside base station... View full abstract»

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  • A prototype adaptive fade countermeasure system for TDMA operation at Ka band

    Publication Year: 1994, Page(s):1197 - 1201 vol.4
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (548 KB)

    Ka band, the 20/30 GHz frequency band for satellite communications, has gained much interest in recent times. It is well suited for applications with small sized earth stations. The major disadvantage of Ka band, however, is its sensitivity to rain fading. Several satellite experiments are being carried out at the moment studying so called adaptive fade countermeasures, the purpose of which is to ... View full abstract»

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  • A spread spectrum modulation method of forward CDMA channel in cellular systems

    Publication Year: 1994, Page(s):1335 - 1338 vol.4
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (192 KB)

    A spread spectrum (SS) modulation method of the forward channel in cellular systems is proposed. This method can be used to improve the transmitting properties of the forward CDMA channel with a given output power at the base station. It can map a number of forward CDMA signals onto a binary signal by orthogonally spreading sequences. The fundamental principle, performance and comparison with conv... View full abstract»

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  • Location enhanced cellular information services

    Publication Year: 1994, Page(s):1143 - 1145 vol.4
    Cited by:  Papers (3)  |  Patents (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (236 KB)

    A new technology is suggested for emergency services which allows immediate aid to be provided using an accurate estimate of the incident location. The user can activate the request for assistance by simply pressing a button. The technology is based on the integration of an innovative FM location technique and a smart mobile phone. The system architecture described in this paper permits both voice... View full abstract»

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  • Future CDMA cellular mobile systems supporting multi-service operation

    Publication Year: 1994, Page(s):1276 - 1279 vol.4
    Cited by:  Papers (18)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (320 KB)

    The two major requirements of future cellular mobile and personal communication systems are: the support of multi-rate services and operation in multi-cell environments. This paper is concerned with the identification and development of efficient and flexible methods of mapping logical traffic and control channels onto physical channels at the air interface for future multi-rate CDMA systems. We a... View full abstract»

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  • Proposal of FSK modulated spread spectrum systems for enhancing frequency utilization efficiency

    Publication Year: 1994, Page(s):1368 - 1372 vol.4
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (280 KB)

    In contrast with direct sequence-spread spectrum, an M-ary system characterized by frequency shift keying-spread spectrum (FSK-SS) is proposed. FSK-SS is comprised of two modulation stages; one selecting a frequency to represent the multiple levels, and the other multiplying a code sequence with the frequency. The shift frequencies are selected in a range less than the chip frequency, while satisf... View full abstract»

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  • Conception of Osmk region communication system development

    Publication Year: 1994, Page(s):1312 - 1315 vol.4
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (340 KB)

    The concept of the Omsk region communication environment development is presented. The Omsk region is an agricultural territory of Siberia centred by a large industrial city. First of all it is necessary to develop wireless communication. An hierarchical computer model is suggested, enabling one to analyse different versions of communication networks. The concept is intended to be used as a basis ... View full abstract»

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  • 50-Mb/s diffuse infrared free-space link using on-off keying with decision-feedback equalization

    Publication Year: 1994, Page(s):1086 - 1089 vol.4
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (300 KB)

    We report an experimental 50-Mb/s free-space infrared link for indoor wireless communication, which achieves low bit-error rates (BERs) in the presence of multipath distortion, shadowing, and ambient natural and artificial lighting. The eye-safe 805-nm transmitter, directed at the ceiling, emits an on-off-keyed signal having 475-mW average power. The receiver employs a 1-cm2 Si p-i-n ph... View full abstract»

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  • Wiener filtering of multi-carrier CDMA in Rayleigh fading channel

    Publication Year: 1994, Page(s):1344 - 1347 vol.4
    Cited by:  Papers (22)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (220 KB)

    Analyzes the application of Wiener filtering to the detection of multi-carrier code division multiple access (MC-CDMA) signals. Simulation results are included to test the validity and accuracy of the analytical results View full abstract»

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  • Issues and challenges of propagation studies for mobile networks

    Publication Year: 1994, Page(s):1285 - 1291 vol.4
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (572 KB)

    Propagation measurements and models are not only important for the proper design of mobile networks, hut also for the simulation of communications systems. The state-of-art is reviewed for path loss results in outdoor and indoor environments, including penetration issues. The physical understanding of the phenomena is stressed. Similarly, wideband issues are discussed, as well as adaptive arrays, ... View full abstract»

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  • A system-platform for mobile computing applications

    Publication Year: 1994, Page(s):1353 - 1358 vol.4
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (496 KB)

    Systems with both mobile and stationary computers are of increasing importance. Mobile users can access information anywhere and anytime. Basic components needed for mobile computing are smart portable computers and wireless communication networks. Major problems due to mobility and the specific characteristics of portable computers and wireless communications are dynamic configuration, moving res... View full abstract»

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  • An efficient time-discrete symbol-spaced simulation model of mobile radio channels

    Publication Year: 1994, Page(s):1300 - 1304 vol.4
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (416 KB)

    We propose a fully parametric, time-discrete, symbol-spaced simulation model of frequency-selective mobile radio channels. The model encapsulates transmission and receiver filters and a physical channel accounting for both Rayleigh and Rice fading. The simulator allows one to accurately trade between complexity and quality of representation of the propagation channel, making use of a digital filte... View full abstract»

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  • Wideband indoor channel measurements for DECT with transmitter positioned inside and outside an office building

    Publication Year: 1994, Page(s):1070 - 1074 vol.4
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (372 KB)

    Personal communication systems and the demand for increased channel capacity requires a closer look to micro and pico cells, which play a significant role for mobile telecommunication systems of the second and third generation (DECT, DCS1800, UMTS). This paper presents channel characteristics for indoor systems operating in the 1800 MHz band if the base station is positioned inside and outside the... View full abstract»

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