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[1992 Proceedings] The Third IEEE International Symposium on Personal, Indoor and Mobile Radio Communications

19-21 Oct. 1992

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Displaying Results 1 - 25 of 132
  • Proceedings of 2nd International Symposium on Personal, Indoor and Mobile Radio Communications

    Publication Year: 1992
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    Freely Available from IEEE
  • HIPERLAN, applications and requirements

    Publication Year: 1992, Page(s):133 - 138
    Cited by:  Papers (10)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (436 KB)

    This paper traces the origins and applications of HIPERLAN, a system for high speed short range radio networks for computers. HIPERLAN, HIgh Performance European Radio LAN, is the name given by the European Telecommunications Institute (ETSI) to the standard it is developing on the subject. The paper also looks at the projected applications of HIPERLAN and closes with a summary of the main operati... View full abstract»

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  • Transmitter diversity characteristics in microcellular TDMA/TDD mobile radio

    Publication Year: 1992, Page(s):545 - 549
    Cited by:  Papers (9)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (300 KB)

    Transmitter diversity is one of the most promising techniques for improving the transmission quality under multipath fading environments without increasing the equipment size at the reception side. In this paper the effect of the fading frequency and antenna correlation are presented theoretically for transmitter diversity applied to microcellular TDMA/TDD mobile radio systems. To cope with degrad... View full abstract»

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  • Performance of a multiple access protocol for an ATM based pico-cellular radio LAN

    Publication Year: 1992, Page(s):139 - 144
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (496 KB)

    In recent years considerable interest has been shown in the development of packet-based in-building radio LANs. Most of these networks use more than one frequency together with slot reservation strategies to handle mobile traffic in a radio environment. This paper proposes an architecture and a related media access protocol, using a single frequency, to support ATM (asynchronous transfer mode) tra... View full abstract»

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  • Wideband DS/CDMA signals in multipath fading channels: analysis, simulation and measurements

    Publication Year: 1992, Page(s):508 - 512
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (316 KB)

    For narrowband signals the envelope of the received signal is well characterised by a Rayleigh random process. Rayleigh fading causes large variations in the signal envelope. For wideband signals, the effect of Rayleigh fading is mitigated. This paper considers the effect of receiver processing on the mitigation effect for wideband DS/CDMA signals. The mitigation effect is shown here by a reductio... View full abstract»

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  • Heavy traffic performance of a class of channel assignment algorithms [cellular telephone systems]

    Publication Year: 1992, Page(s):550 - 555
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (436 KB)

    The authors present a study of the performance of a general class of channel assignment algorithms. These algorithms, which they call Ω-algorithms, are completely characterized by the set of carried-traffic “states” which they allow. They show that for any such algorithm, there is a closed-form expression for the carried traffic function, which lends itself to several kinds of as... View full abstract»

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  • A proposed access method for the wireless LAN standard

    Publication Year: 1992, Page(s):145 - 148
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (208 KB)

    The attempt by the IEEE802.11 wireless LAN standard to fulfil the user anticipated performance expectations has imposed a challenging demand on its access method selection. To utilize the valuable shared spectrum resources effectively, a demand assigned multiple access method is proposed to meet this goal. The method is tailored to suit the key requirement specifications which are at present being... View full abstract»

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  • Building penetration loss at 1700 MHz along line of sight street microcells

    Publication Year: 1992, Page(s):86 - 87
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (160 KB)

    In street microcells with low antenna heights the output power can be kept very low when coverage only is wanted along a line of sight street. However if one also wants to have coverage in buildings along the street, then one needs an extra margin due to the building penetration loss. From measurement at 1700 MHz with a base station located in the street it is shown that the path loss can be at le... View full abstract»

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  • Reed-Solomon coded QAM modulation on a Rayleigh fading channel

    Publication Year: 1992, Page(s):591 - 595
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (344 KB)

    The authors propose the design of a coded transmission system for the terrestrial urban radio channel, with a 4 bit-spectral efficiency. They evaluated the performances of a Reed-Solomon coded 64-QAM modulation on a Rayleigh fading channel. Three decoding algorithms are considered: a hard decision and an erasure Berlekamp-Massey decoding algorithm and a soft decision maximum likelihood decoding al... View full abstract»

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  • Performance of slotted ALOHA in multiple joint cells of wireless networks

    Publication Year: 1992, Page(s):271 - 275
    Cited by:  Papers (7)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (300 KB)

    In wireless networks, multiple-cell structure to cover a wider area is a common approach. As the channels are usually hard to predict due to fast, deep, and dynamic fading, many traditional protocols like token passing, carrier sense multiple access, etc. are not appropriate to maintain successful performance. Slotted ALOHA and its variations are still attractive approaches. Traditional analysis o... View full abstract»

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  • Performance analysis of a CDMA cellular system in the multipath fading environment

    Publication Year: 1992, Page(s):108 - 111
    Cited by:  Papers (18)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (264 KB)

    One advantage of CDMA cellular systems is that they allow mobiles to transmit at any time instant without mutual synchronization. The cost of this flexibility is the tolerance of interference from other users in the same cell. In cellular applications, however, the effects of interference are further compounded by the multipath fading environment, because each interferer can generate several inter... View full abstract»

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  • A European standard for packet-mode mobile data

    Publication Year: 1992, Page(s):513 - 519
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (540 KB)

    An activity has been set up to develop a public standard for trunked radio and mobile data systems. The standards being developed are generically known as TETRA, standing for trans-European trunked radio. The ETSI is responsible for defining the TETRA standard. TETRA is really a family of standards. One branch of the family is a set of radio and network interface standards for trunked voice (and n... View full abstract»

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  • A study on diversity techniques in a 5.8 GHz microwave link for traffic management systems

    Publication Year: 1992, Page(s):556 - 560
    Cited by:  Papers (7)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (296 KB)

    Future traffic management systems require a bidirectional communication between roadside beacons and vehicles. Several studies are concentrated on a short range microwave link for this application. Multipath fading effects, due to reflections on the road, vehicles or buildings, may interfere with the communication. In this paper, antenna and frequency diversity techniques are considered for a solu... View full abstract»

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  • A framework for specifying a physical layer and medium for wireless local area networks

    Publication Year: 1992, Page(s):149 - 152
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (404 KB)

    A conceptual framework for specifying a physical layer and a medium for a wireless local area network is detailed. This framework defines a physical layer entity consisting of a medium independent sublayer, a physical convergence sublayer and a medium dependent sublayer. The action of this physical layer entity is to provide a bidirectional mapping between the information present at the media acce... View full abstract»

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  • Joint data and channel estimation for TDMA mobile channels

    Publication Year: 1992, Page(s):235 - 239
    Cited by:  Papers (25)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (364 KB)

    One of the main problems in the proposed Northern American digital cellular system (IS-54) is the poor performance of the receiver for fast fading channels. The authors propose to use a novel joint data and channel estimation technique to improve performance. The basic idea of this method was described by N. Seshadri (1990) in the context of blind equalization. Simulation results indicate that thi... View full abstract»

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  • Characterizing wireless indoor communications: measurements in the ISM bands with a directional antenna

    Publication Year: 1992, Page(s):315 - 319
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (264 KB)

    The measurements presented here characterize the effectiveness of a directional antenna in indoor radio environments. The authors made wideband measurements at the ISM bands, which are centered around 910 MHz, 2.44 GHz, and 5.8 GHz. An omnidirectional antenna is used at the transmitting end, and a horn antenna with a 3 dB beamwidth of about 45 degrees is used at the receiving end. The envelope of ... View full abstract»

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  • A multipath channel model for mobile-radio communications

    Publication Year: 1992, Page(s):92 - 97
    Cited by:  Papers (3)  |  Patents (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (384 KB)

    A model for the mobile radio channel is proposed that is intended to apply to wideband signals in the 900 MHz band. The model is specified by a two-variable impulse response hx(t), where x represents the location of the receiver. The model consists of two submodels, one describing the direct line-of-sight path, and the other the signal that reaches the receiver over simple reflections. ... View full abstract»

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  • The adaptive rake matched filter in a time-variant two-path channel

    Publication Year: 1992, Page(s):441 - 445
    Cited by:  Papers (2)  |  Patents (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (260 KB)

    The effect of channel estimation errors upon the performance of an adaptive rake matched filter in a DS spread-spectrum system is studied in a two-path channel. A moving average filter with a memory of M bit intervals is used in the channel estimation. The estimation errors are mainly caused by channel noise and channel impulse response variations during the observation interval. The performance o... View full abstract»

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  • A rake receiver which adapts to fast fading

    Publication Year: 1992, Page(s):456 - 459
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (216 KB)

    An ideal rake-receiver has as many correlators as there are propagation paths in the channel. All practical implementations, however, have much fewer correlators. On a channel that fades very quickly, these few correlators collect the signal from the paths that are strongest on average. In this situation the classical analysis of the ideal rake receiver found in the textbooks can be applied to rec... View full abstract»

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  • A full digital modem for offset type modulation schemes

    Publication Year: 1992, Page(s):596 - 599
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (280 KB)

    This paper proposes a full digital modem employing a reverse-modulation type carrier recovery scheme for offset type modulation schemes. The full digital modem employs a wave forming filter for reverse-modulation of offset type modulated signals to increase the extracted carrier signal-to-noise ratio. The proposed modem achieves both high speed carrier acquisition and low carrier slipping rate sim... View full abstract»

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  • Spread slotted ALOHA techniques for personal satellite communications: performance analysis

    Publication Year: 1992, Page(s):276 - 281
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (436 KB)

    The authors study spread slotted ALOHA (SSA) techniques which combine certain characteristics of both spread spectrum and slotted ALOHA (SA) systems to achieve better performance than the constituent systems. Their results demonstrate that SSA offers significant improvements in terms of throughput, delay and network stability against excessive loading at very acceptable levels of receiver implemen... View full abstract»

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  • Inter-channel interference cancellation technique for CDMA mobile/personal communication systems

    Publication Year: 1992, Page(s):112 - 117
    Cited by:  Papers (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (384 KB)

    In order to increase the channel capacity of CDMA (code division multiple access) mobile/personal communication systems, an inter-channel interference cancellation (IIC) technique is proposed. By employing one or few additional interference cancellation circuits, it makes it possible to increase allowable error of the TXPC (transmission power control) at the mobile/personal terminals. The experime... View full abstract»

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  • Dual rate mobile data system

    Publication Year: 1992, Page(s):520 - 524
    Cited by:  Patents (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (344 KB)

    A mobile data system that uses two significantly different data rates on the air interface is described. In a cellular system it is the conditions prevailing for a mobile terminal at the cell border that is setting the limit for a reasonable data rate. However, there are conditions in the cell, e.g. a stationary terminal close to the base station, where it is possible to use a higher data rate. A ... View full abstract»

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  • Bit error measurements on a 5.8 GHz mobile radio channel for short range traffic management systems

    Publication Year: 1992, Page(s):561 - 565
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (468 KB)

    To investigate the performance of a planned short range traffic management system with data rates more than 1 Mbit/s in case of multipath effects, an experimental system has been built. Bit error properties are investigated by recording transmitted pn-sequences in real time and off-line analysis using correlation techniques. Measurement results regarding the dependence of bit errors and clock erro... View full abstract»

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  • Nonlinear digital phase estimation for mobile communications

    Publication Year: 1992, Page(s):194 - 198
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (364 KB)

    The nonlinear digital carrier synchronization structure is a coherent demodulation technique that has many advantages for mobile communications. The nonlinear digital synchronizer is investigated in the presence of time varying fading for BPSK, QPSK, and π/4-QPSK modulations. This paper addresses the design of optimal unconstrained smoothing filters for the nonlinear synchronizer structure. An ... View full abstract»

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