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Communications, IEEE Transactions on

Issue 9 • Date September 1987

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Displaying Results 1 - 17 of 17
  • [Front cover and table of contents]

    Publication Year: 1987 , Page(s): 0
    Save to Project icon | Request Permissions | PDF file iconPDF (201 KB)  
    Freely Available from IEEE
  • [Back cover]

    Publication Year: 1987 , Page(s): 0
    Save to Project icon | Request Permissions | PDF file iconPDF (272 KB)  
    Freely Available from IEEE
  • Trellis-Coded MPSK with Reference Phase Errors

    Publication Year: 1987 , Page(s): 888 - 900
    Cited by:  Papers (13)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (1032 KB)  

    With trellis-coded MPSK schemes, reference phase errors have a major impact on the system performance. This paper analyzes the interrelation among the coded-modulation format, the reference phase tracker, and the carrier phase noise. A tight upper bound to the error probability of a maximum likelihood decoder is introduced. This bound reveals eight new distance-type functions which, along with the... View full abstract»

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  • A Practical Receiver Structure for Multi-h CPM Signals

    Publication Year: 1987 , Page(s): 901 - 908
    Cited by:  Papers (13)  |  Patents (4)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (776 KB)  

    Multi- h schemes are bandwidth-efficient CPM signaling formats which offer means of coding without explicit redundancy. However, the required (optimal) receiver structures tend to be very complex [1], [4], [8] requiring a large number of filters of correlators. Here a reduced complexity receiver for the joint estimation of M View full abstract»

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  • Modeling and Prediction of Traffic Fluctuations in Telephone Networks

    Publication Year: 1987 , Page(s): 931 - 941
    Cited by:  Papers (13)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (880 KB)  

    Discrete-time stochastic models designed to encompass various sequential measurements of telephone traffic are derived from assumptions of classical queueing theory. The models are linear and their coefficients depend on the measurement cycle length normalized by the mean holding time. Proposed descriptions are tested against the real data gathered by the supervisor of the French toll network. For... View full abstract»

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  • Simulation Studies on Nonlinear Bit Synchronizers in APD-Based Optical Receivers

    Publication Year: 1987 , Page(s): 909 - 917
    Cited by:  Papers (5)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (688 KB)  

    This paper examines the problem of self bit synchronization employing nonlinear timing extraction schemes in optical receivers with avalanche photodetectors (APD) through digital computer simulation. A direct algorithm is developed for the simulation of sample functions of the APD output process with due consideration to intersymbol interference (ISI). Simulation of all the functional blocks used ... View full abstract»

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  • Performance of Coherent Phase and Amplitude Digital Modulations with Carrier Recovery Noise

    Publication Year: 1987 , Page(s): 972 - 976
    Cited by:  Papers (14)  |  Patents (1)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (408 KB)  

    A model of decision feedback carrier recovery noise is presented as a function of the number of symbols over which the carrier is derived. For this model, quantitative results for performance degradation in BPSK, QPSK, 8-phase, 16-QAM, 32-QAM, and 64-QAM coherent demodulators are presented. When the carrier is derived from only the last symbol, these results reduce to the performance for different... View full abstract»

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  • Performance Evaluation of Combined Coding and Modulation Schemes for Nonlinear Channels

    Publication Year: 1987 , Page(s): 969 - 972
    Cited by:  Papers (4)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (376 KB)  

    The performance of combined coding and modulation schemes in channels with intersymbol interference and nonlinearities is studied using an analytical approach. The class of possible receivers is presented, and a generalization of the minimum Euclidean distance used for the asymptotic analysis of the performance of combined coding and modulation schemes on AWGN channels is introduced. Numerical res... View full abstract»

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  • A Generalized Analysis for a Dual Threshold Sequential Detection PN Acquisition Receiver

    Publication Year: 1987 , Page(s): 956 - 960
    Cited by:  Papers (3)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (504 KB)  

    Spread spectrum techniques have become very useful in modern communications. A common spread spectrum technique is to directly modulate a pseudorandom noise (PN) code onto the carrier. Systems employing this technique are called direct sequence (DS) systems. A primary concern with direct sequence systems involves PN code synchronization (acquisition) of the incoming and local signals to within at ... View full abstract»

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  • Gain-Adaptive Vector Quantization with Application to Speech Coding

    Publication Year: 1987 , Page(s): 918 - 930
    Cited by:  Papers (28)  |  Patents (4)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (1472 KB)  

    The generalization of gain adaptation to vector quantization (VQ) is explored in this paper and a comprehensive examination of alternative techniques is presented. We introduce a class of adaptive vector quantizers that can dynamically adjust the "gain" or amplitude scale of code vectors according to the input signal level. The encoder uses a gain estimator to determine a suitable normalization of... View full abstract»

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  • Optimum Spectrum for QAM Perturbed by Timing and Phase Errors

    Publication Year: 1987 , Page(s): 978 - 980
    Cited by:  Papers (3)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (232 KB)  

    An optimum spectrum is presented for a multilevel QAM system perturbed by timing error, phase error, and additive noise. We propose a double-jump spectrum (DJS) whose segment height is generally different from that of Franks' spectrum. The performance is analyzed with Gauss quadrature rules and a computer simulation. The results are compared to Franks' spectrum and the conventional cosine rolloff ... View full abstract»

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  • The Influence of Cycle Slipping on the Error Probability of a PAM Receiver

    Publication Year: 1987 , Page(s): 961 - 968
    Cited by:  Papers (3)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (744 KB)  

    In this paper, we evaluate the error probability of a PAM receiver, which derives symbol timing from the received waveform by means of a synchronizer. We point out that the conventional way (using the distribution of the synchronizer's modulo-2π- reduced phase error) of evaluating this error probability does not take into account the effect of the synchronizer's cycle slips. We present a corr... View full abstract»

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  • Blind Equalization and Carrier Recovery Using a "Stop-and-Go" Decision-Directed Algorithm

    Publication Year: 1987 , Page(s): 877 - 887
    Cited by:  Papers (219)  |  Patents (21)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (824 KB)  

    We show that the standard decision-directed estimatedgradient adaptation algorithm for joint MSE equalization and carrier recovery, normally utilized in the open-eye condition, can be turned into an algorithm providing effective blind convergence in the MSE sense, usable in the closed-eye startup phase with no need of a known training sequence. This is obtained by means of a simple flag telling bo... View full abstract»

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  • Rapid Training of a Voiceband Data-Modem Receiver Employing an Equalizer with Fractional-T Spaced Coefficients

    Publication Year: 1987 , Page(s): 869 - 876
    Cited by:  Papers (42)  |  Patents (12)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (824 KB)  

    Fast initial training of a voiceband data-modem receiver which employs an equalizer with fractionl- T spaced coefficients is presented. The modem receiver performs rapid gain acquisition, and monitors the equalizer delay line for the presence of a periodic training signal whose period is equal to the length of the equalizer delay line. Testing for periodicity i... View full abstract»

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  • Effects of Long-Term Clock Instability on Master-Slave Networks

    Publication Year: 1987 , Page(s): 950 - 955
    Cited by:  Papers (2)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (584 KB)  

    Two types of master-slave networks are investigated: oneway and two-way master-slave networks. The one-way master-slave System is a generalization of the well-known hierarchical master-slave tree system. The two-way master-slave system is a novel concept. Sufficient stability conditions are given for both network types. After synchronization is achieved, the frequency drift rate of all oscillators... View full abstract»

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  • An Error Probability Formula for M-ary DPSK in Fast Rician Fading and Gaussian Noise

    Publication Year: 1987 , Page(s): 976 - 978
    Cited by:  Papers (26)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (256 KB)  

    A formula for the symbol error probability is derived which applies to differential detection of M -ary phase-shift keying (MDPSK) in fast Rician fading and white Gaussiau noise. This formula is an extension of a result already known for MDPSK in Gaussian noise interference. View full abstract»

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  • Analysis on Partial Overflow Queueing Systems with Two Kinds of Calls

    Publication Year: 1987 , Page(s): 942 - 949
    Cited by:  Papers (2)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (648 KB)  

    In this paper, the traffic model of one kind of the partial overflow system is presented and theoretically analyzed, which has remained unsolved up to today. In the partial overflow systems, the considered overflow traffic stream is a part of the traffic stream overflowing from a common trunks group with multiinput calls. The systems with two kinds of calls are treated. Both of the two input traff... View full abstract»

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Aims & Scope

IEEE Transactions on Communications focuses on all telecommunications including telephone, telegraphy, facsimile, and point-to-point television by electromagnetic propagation.

 

 

Full Aims & Scope

Meet Our Editors

Editor-in-Chief
Robert Schober
University of British Columbia