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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  • 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 (492 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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  • Effect of local variations of width and orientation of a corridor on the propagation of high frequency waves

    Publication Year: 1994, Page(s):1414 - 1418 vol.4
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (379 KB)

    The propagation of high frequency waves inside a corridor can be modelled by ray theory. Walls behaves as reflected planes with dimensions much greater than the wavelength. These planes are limited in space creating diffracted effects which are very significant for many configurations and which can be taken into account owing to the uniform theory of diffraction. We examine only configurations whi... View full abstract»

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  • Author index

    Publication Year: 1994
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    Freely Available from IEEE
  • Study the transposition of the mechanism of station insertion on a logical ring composed of infrared links

    Publication Year: 1994, Page(s):1101 - 1105 vol.4
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (496 KB)

    This article presents the first results of a study concerning the transposition of a mechanism for token management in the case of a local wireless network characterized by low range links. We have applied the concepts developed in these conditions to a configuration composed of nomadic stations using diffused infrared to communicate. The access right to the infrared channel remains via the token ... View full abstract»

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  • Direct detect modulations of high speed indoor diffused infrared wireless transmission

    Publication Year: 1994, Page(s):1096 - 1100 vol.4
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    High speed indoor diffused infrared wireless transmission is greatly needed for data and multimedia applications. We investigated the error rate performance of OOK (on off keying), NRBI (non-return-to zero with bit insertion), M-ary PPM (pulse position modulation), and two novel coded direct detect modulations, DCGPPM (differentially coded and guarded PPM) and MRLC (modified run length code), by a... View full abstract»

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  • A hybrid CDMA-FDMA indoor microcellular scenario

    Publication Year: 1994, Page(s):1305 - 1308 vol.4
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    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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  • Mobile communications in Europe

    Publication Year: 1994, Page(s):1430 - 1441 vol.4
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    The evolution of mobile and personal communications represents one of the megatrends which dominate the current developments in communications. Mobile and personal communications networks will form a major component of the future communications environment in Europe. The European Union enjoys a position of technological leadership in this sector. Maintaining this position and drawing maximum benef... 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)
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    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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  • Sectored receivers for indoor wireless optical communication systems

    Publication Year: 1994, Page(s):1090 - 1095 vol.4
    Cited by:  Papers (20)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (564 KB)

    This document proposes and studies a novel receiver structure for indoor optical wireless communication systems that exploits the directional nature in both signal and noise propagation through the use diversity techniques. In this document we concentrate on the ability of the proposed sectored receiver in combating the ambient noise. Significant optical power gains are demonstrated and are seen t... View full abstract»

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  • Channel assignment techniques for in-building PCS microsystems

    Publication Year: 1994, Page(s):1151 - 1155 vol.4
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (456 KB)

    Channel assignment schemes are evaluated that are suitable for the large scale uncoordinated deployment of in-building PCS microsystems in a dense urban area. Three fully distributed dynamic channel assignment strategies are evaluated by computer simulation in terms of their call blocking probabilities. Baseline comparisons are made to a fixed channel assignment scheme that assigns channels with c... View full abstract»

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  • Multiple access capability of indoor wireless networks using spatial diversity

    Publication Year: 1994, Page(s):1271 - 1275 vol.4
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (468 KB)

    We address the improvement in multiple access capability of an indoor wireless network that is achieved when equipment employing adaptive arrays is used. We specifically apply this improvement to the problem of optimal base-station placement. In the past we have considered indoor environments with conventional omnidirectional antennas. In this study we consider indoor wireless systems using adapti... View full abstract»

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  • A modified RAKE receiver for a DS/CDMA cellular mobile system

    Publication Year: 1994, Page(s):1419 - 1423 vol.4
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (304 KB)

    In this paper a direct sequence spread-spectrum multiple access communication system is studied for a frequency selective mobile radio channel. The reverse link (mobile to base station) is analysed, assuming Rayleigh fading channel and K asynchronous users, with M orthogonal sequences per user. The analysis is based on the consideration of the quadrature components of the signal and noise. The pro... 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)
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    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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  • 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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  • Quality of speech services in GSM-definition of a universal quality parameter for quality comparison and evaluation

    Publication Year: 1994, Page(s):1348 - 1352 vol.4
    Cited by:  Patents (5)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (396 KB)

    Users of mobile communication networks tend to make higher demands upon quality of mobile communication services. Therefore it is important for GSM network operators to know the factors that determine the quality perceived by users of GSM speech services. Quality factors of GSM speech services are presented and a set of quality parameters belonging to these is given. Also a universal combined qual... 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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  • Mobile and personal communications in ACTS

    Publication Year: 1994, Page(s):1292 - 1299 vol.4
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (632 KB)

    Recognising the strategic importance of telecommunications as a major driving force of socioeconomic progress, the European Community has launched the RACE Programme, which ended in 1995. The follow-up of the RACE Programme, referred to as ACTS, will in the period up to 1998, reflect a change of emphasis towards a demand driven research and development programme. In this context, R&D in mobile... View full abstract»

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  • PCS number portability

    Publication Year: 1994, Page(s):1146 - 1150 vol.4
    Cited by:  Papers (2)  |  Patents (55)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (376 KB)

    Intelligent network (IN) and non-IN architectures are described that support personal communications services (PCS) number portability independent of the service provider (SP) that is used. Database query rates and call setup times are computed for selected architectures. To attain number portability, it is concluded that Common Channel Signaling System 7 is the principal ingredient for successful... 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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  • Simulation study of the capacity bounds in cellular systems

    Publication Year: 1994, Page(s):1114 - 1120 vol.4
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (548 KB)

    We investigate the capacity of cellular systems. In particular, we study how the reuse factor can be improved given the knowledge of the mobiles' locations; i.e., we evaluate the minimum number of channels required to support a cellular infrastructure with a given number of mobiles in each cell. We assume that the mobiles' locations are sampled from the uniform random distribution or are fixed on ... View full abstract»

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  • Data networking using public paging systems

    Publication Year: 1994, Page(s):1447 - 1448 vol.4
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (120 KB)

    Paging is basically simple data transmission, designed for short messages and one way transmission. The focus in the paging business has this far been on the personal messages entered via an ordinary telephone, typically in the form of a telephone number or just a beep. With the pan European paging system, ERMES, the road is being paved for using paging also for data purposes. ERMES is meant to be... View full abstract»

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  • Design of an all digital direct-sequence spread-spectrum receiver

    Publication Year: 1994, Page(s):1364 - 1367 vol.4
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (248 KB)

    The theory of a fully digital coherent direct-sequence spread-spectrum receiver for microprocessor implementation is described. The receiver samples the input signal at IF and uses a Costas loop for carrier tracking, a delay-lock loop for code tracking, and a serial search acquisition scheme to find the initial code phase. A prototype of the receiver based on the TMS320C25 digital signal processor... View full abstract»

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  • Performance analysis of DS-CDMA with slotted ALOHA random access for packet PCNs

    Publication Year: 1994, Page(s):1034 - 1039 vol.4
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (476 KB)

    Presents a discrete Markov chain based analytic framework for the study of DS-CDMA with slotted ALOHA (DS-CDMA-S-ALOHA) random access protocols. The key feature of the work is that it distinguishes between the two stages in the transmission process, namely the access stage and the reception stage, which characterize the random access and the random errors associated with DS-CDMA-S-ALOHA respective... View full abstract»

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  • Multiple access stack algorithm with imperfect feedback

    Publication Year: 1994, Page(s):1126 - 1128 vol.4
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (196 KB)

    The performance of free-access stack algorithm with feedback noise is considered. The noise intensity depends on the state the system is in (a `good' or a `bad' state). The transition from one state to an other is guided by a Markov chain. It is shown that the packet delay in a two-state system is different from the packet delay in a one-state system (with constant noise and the same mean noise in... View full abstract»

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