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Advanced Modulation and Channel Coding Techniques for Mobile and Personal Communications, IEE Colloquium on

Date 16-16 Nov. 1992

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Displaying Results 1 - 10 of 10
  • RS codes: An attractive choice for low bit rate speech transmission in PCS

    Publication Year: 1992, Page(s):1/1 - 10/4
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (231 KB)

    Differential coherent 8-DPSK, 16-DSPK and 8/8-DAPSK modulation schemes have been investigated for use in a frequency-hopping code division multiple access system. For this purpose, a Rayleigh and Ricean fading model for the frequency hopping system has been developed. A FH system which uses these modulation schemes and Reed-Solomon (RS) codes as forward error correction in the presence of Rayleigh... View full abstract»

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  • Coded modulation for mobile radio communications: Practical implementation feasibility and performance

    Publication Year: 1992, Page(s):2/1 - 9/7
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (308 KB)

    Advanced CDMA (ACDMA) for mobile or personal communications, now under investigation in Europe, is the competing technology to advanced TDMA (ATDMA) aiming to satisfy the user's needs by the end of the next decade. Multimedia mobile communications (MMC) will be common in 3rd generation systems. The use of low rate orthogonal convolutional (LOROC) coding in future ACDMA systems is addressed. In a m... View full abstract»

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  • Performance comparison of high level modulation techniques for land mobile communications

    Publication Year: 1992, Page(s):3/1 - 8/4
    Cited by:  Papers (1)  |  Patents (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (255 KB)

    The problem of error control with decoding based on the Viterbi algorithm is addressed. Particular codes correspond to patterns of local wiring and this leads to the possibility of realising programmable reconfigurable or adaptive Viterbi decoders according to the crosspoint switch technology employed. For sequential implementations these establish the possibility of simplifying the access circuit... View full abstract»

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  • Speech performance of adaptive transceivers for PCN

    Publication Year: 1992, Page(s):4/1 - 7/5
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (189 KB)

    The bandwidth limitations have been determined when injecting the modulating signal only at the phase detector or at the voltage controlled oscillator of a PLL modulator. To overcome these restrictions two-point modulation can be used, where signals are injected at both points simultaneously. The effect of mismatch in the loop constants have been analysed, and results demonstrate the tolerance of ... View full abstract»

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  • Performance evaluation of anti-multipath modulation techniques

    Publication Year: 1992, Page(s):6/1 - 6/6
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (260 KB)

    In the mobile radio communication environment the signal arriving at the receiver is composed of replicas of the transmitted signal and which have travelled over independently fading paths. This often causes a considerable time dispersion in the received signal. Recently published papers have shown that properly planned phase modulation followed by differential detection can have a robust feature ... View full abstract»

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  • Optimum loop bandwidth of phase-locked modulators

    Publication Year: 1992, Page(s):7/1 - 5/4
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (230 KB)

    For the purposes of the paper, 'modulation coding' is a generic term used to indicate the direct upward frequency translation of a unipolar baseband signal to that of a bipolar or higher-bipolar bandpass signal within the theoretical minimum bandwidth, or a sub-multiple thereof, by means of a single modulation process: the quasi-analogue nature of the resulting intersymbol interference waveform be... View full abstract»

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  • VLSI design of rate 2/3 Viterbi decoders

    Publication Year: 1992, Page(s):8/1 - 4/6
    Cited by:  Patents (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (367 KB)

    Experiments are conducted using a number of adaptive transmission systems that are suitable for third generation personal communications networks (PCN). It becomes apparent that the selection of the type of modem and number of modulation levels of the modem, the speech codec to be used, and whether to deploy a channel codec, depends on the channel SNR and teletraffic demand if the power consumptio... View full abstract»

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  • On the radio interface of future ACDMA systems

    Publication Year: 1992, Page(s):9/1 - 2/6
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (303 KB)

    The authors are investigated trellis coded modulation (TCM) as a candidate modulation scheme for use in a future universal mobile telecommunications system (UMTS) system. To this end, a transceiver architecture is proposed which incorporates TCM, and which would meet the likely relay constraints of the services to be supported by such a future system. A reduced complexity near-maximum likelihood s... View full abstract»

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  • Performance comparison of various M-ary modulation schemes for frequency-hopping system over fading channels

    Publication Year: 1992, Page(s):10/1 - 1/4
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (281 KB)

    Future personal communication systems (PCS) might involve a synergy of low Earth orbit (LEO) satellite and cellular radio technologies. For speech transmission, they will have to meet certain operational criteria to be qualitatively and economically viable. One of the most important of these is robustness to channel errors. The paper presents a case for the adoption of Reed-Solomon codes for FEC i... View full abstract»

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  • Modulation coding for efficient bandpass data transmission

    Publication Year: 1992
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (23 KB)

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