IEEE Transactions on Communications

Issue 8 • August 1973

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Displaying Results 1 - 23 of 23
  • [Front cover and table of contents]

    Publication Year: 1973, Page(s): 0
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    Freely Available from IEEE
  • Probability of Error in Binary Communication Systems with Causal Band-Limiting Filters - Part I: Nonreturn-to-Zero Signal

    Publication Year: 1973, Page(s):878 - 890
    Cited by:  Papers (8)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (807 KB)

    Upper and lower bounds to probability of error in binary communication systems with intersymbol interference are presented. Closed-form formulas are given for systems with filters having a finite number of lumped elements. Explicit results are given when the filters are Butterworth filters of orderN = 1, 2,..., 10. Four systems are considered: with a sample detector (SD), with an integr... View full abstract»

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  • Probability of Error in Binary Communication Systems with Causal Band-Limiting Filters - Part II: Split-Phase Signal

    Publication Year: 1973, Page(s):891 - 898
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (552 KB)

    The probability of error is computed in four binary communication systems withNth order (N = 1, 2,...,10) Butterworth filters and split-phase signals. The systems have either a sampling detector or an integrating-and-dumping detector; the filter is either in the receiver only or both in the receiver and transmitter. A lower bound to the probability of error is also computed f... View full abstract»

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  • Maximum Likelihood Phase Demodulation for Spatially Turbulent Channels

    Publication Year: 1973, Page(s):927 - 933
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (680 KB)

    The likelihood equation for the maximum likelihood estimate (MLE) of a temporal phase modulation (a sample function of a wide-sense stationary zero-mean Gaussian random process) received in a spatial aperture after transmission through a spatially turbulent channel and addition to a white Gaussian noise field is derived for unknown, Gaussian, and limiting cases of log-normal received signal fields... View full abstract»

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  • Recursive Ideal Observer Detection of Known M-ary Signals in Multiplicative and Additive Gaussian Noise

    Publication Year: 1973, Page(s):948 - 953
    Cited by:  Papers (13)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (681 KB)

    This paper presents the derivation of the recursive algorithms necessary for real-time digital detection ofM-ary known signals that are subject to independent multiplicative and additive Gaussian noises. The motivating application is minimum probability of error detection of digital data-link messages aboard civil aircraft in the earth reflection multipath environment. For each known si... View full abstract»

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  • Effect of Hard Limiting on a Quadrature PSK Signal

    Publication Year: 1973, Page(s):955 - 958
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (316 KB)

    The effect of a hard limiter on a quadrature PSK (QPSK) signal is determined for a sample detector and an integrate and dump detector. In the latter case theBTproduct is assumed to be infinite. The degradation due to hard limiting is approximately 1 dB. View full abstract»

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  • [Back cover]

    Publication Year: 1973, Page(s): 0
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    Freely Available from IEEE
  • Comparison of Bedrosian-Rice and Carson-Fry Methods for Calculating Angle-Modulation Distortion

    Publication Year: 1973, Page(s):971 - 975
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (376 KB)

    The Bedrosian-Rice series method for calculating anglemodulation distortion is compared with the representative earlier method by Carson and Fry. The Bedrosian-Rice method is determined to be more attractive because the convergence properties are better, the calculations are simpler, and the series is more adaptable to the digital computer. View full abstract»

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  • Random Timing Noise Growth in a Cascaded Digital Regenerator Chain

    Publication Year: 1973, Page(s):969 - 971
    Cited by:  Papers (8)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (296 KB)

    A restriction on the type of phase-locked loop usable as a timing filter in digital regenerative repeaters is discussed. The limitation arises from the growth of random timing noise. It is shown that the use of second-order loops enables an improvement of less than 1 dB in noise bandwidth over the comparable first-order loop. View full abstract»

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  • Band-Limited Random-Real-Zero Signals

    Publication Year: 1973, Page(s):933 - 936
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (440 KB)

    Band-limited (BL) random-real-zero (RRZ) signals are a class of stationary stochastic processes whose zero crossings are the randomly perturbed zeros of a sinusoid. They are the only nontrivial examples known to date of band-limited signals whose correlation function and power spectrum can be computed exactly from a probabilistic description of their zeros. Such signals have optimal correlation ch... View full abstract»

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  • Level Selection for a Level Crossing Receiver

    Publication Year: 1973, Page(s):953 - 954
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (248 KB)

    In this paper a technique for setting the level in a levelcrossing detector is discussed. Experimental verification of this method is given along with measurements of receiver performance. View full abstract»

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  • Reliability Optimization in Multiloop Communication Networks

    Publication Year: 1973, Page(s):898 - 907
    Cited by:  Papers (7)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (832 KB)

    The rapidly growing interest in loop communication systems is accompanied by an increasing need to improve their reliability and reduce their vulnerability. This paper analyzes the reliability of multistage loop networks. Analytical expressions for topologies exhibiting maximum availability are obtained in terms of key-component down-time ratios. These optimal topologies are expressed in terms of ... View full abstract»

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  • Effect of Quadrature and Demodulation Phase Errors in a Quadrature PSK System

    Publication Year: 1973, Page(s):945 - 948
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (352 KB)

    Quadrature and demodulation phase errors in a quadrature PSK system cause crosstalk between channels. It is shown that the tracking loop signal-to-noise ratio must be at least 5 dB greater than for PSK to give the same performance. View full abstract»

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  • Practical Multistage Space-Time Switching Networks

    Publication Year: 1973, Page(s):919 - 922
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (456 KB)

    This paper discusses PCM switching networks using combined space-time (ST) nonblocking switches in multistage arrays. The interplay between switch, network, and path-search characteristics is considered and the networks chosen for the Swiss system IFS-1 are described. View full abstract»

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  • Radio Frequency Pulsewidth Modulation

    Publication Year: 1973, Page(s):958 - 966
    Cited by:  Papers (45)  |  Patents (12)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (768 KB)

    The width of a train of square pulses can be varied to produce a modulated carrier at the pulse repetition frequency. When the pulse train is generated by switching (class D) transistors, highefficiency operation is possible. The efficiency of this type of amplifier can be significantly higher than that of conventional pulsewidth modulation amplifiers, since the switching rate is reduced. In addit... View full abstract»

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  • Telecommunications Integrated Network

    Publication Year: 1973, Page(s):916 - 919
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (512 KB)

    This paper presents a short general survey of the integrated network problems. How digital techniques can provide new capabilities of transmission and switching of the information that could allow the progressive realization of a single universal network of telecommunications is examined. View full abstract»

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  • The Introduction of IFS-1 into a Conventional System: A Preliminary Study

    Publication Year: 1973, Page(s):922 - 925
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (448 KB)

    A conventional telephone network and the proposed IFS-1 integrated PCM system [1] differ in their hardware, software, and callrouting policies. IFS-1 has been designed with a measure of hardware and software compatibility with the conventional systems in use in Switzerland: an IFS-1 terminal accepts both analog channels and the full range of existing signalings. However, IFS-1's new network struct... View full abstract»

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  • Performance of Jointly Optimized Prefilter-Equalizer Receivers

    Publication Year: 1973, Page(s):941 - 945
    Cited by:  Papers (5)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (488 KB)

    A linear receiver for digital communication over unknown dispersive and noisy channels obtained by jointly optimizing the prefilter and equalizer has been described by the authors in a recent paper [4]. An extension to incorporating a decision-feedback equalizer is made. Performance of the new receiver is evaluated by means of computer simulation. Comparison of the performance of the new receiver,... View full abstract»

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  • Detection Processes for Orthogonal Groups of Digital Signals

    Publication Year: 1973, Page(s):907 - 915
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (984 KB)

    This paper studies various iterative detection processes for use in a synchronous serial data-transmission system where the signalelements are transmitted in orthogonal groups. The methods of operation of the different detection processes are first described, and then results of computer simulation tests are presented to compare the tolerances of the detection processes to additive white Gaussian ... View full abstract»

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  • Multiplexing and Switching of Data in Synchronous Networks and the Realization in the EDS System

    Publication Year: 1973, Page(s):925 - 927
    Cited by:  Papers (2)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (360 KB)

    Data networks using PCM transmission links include synchronous data multiplexers and data exchanges. The function of these multiplexers and exchanges is described, taking the system units for synchronous networks of the EDS system as an example. View full abstract»

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  • The Effects of Channel Errors in DPCM Systems and Comparison with PCM Systems

    Publication Year: 1973, Page(s):867 - 877
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (920 KB)

    In a communications system the total system error is of importance. One measure of system error is the mean-square error between the input signal and the output signal. The total mean-squared error includes sampling error, quantization error, and channel error. The work reported here considers all three errors in differential pulsecode modulation (DPCM) systems and compares the results obtained wi... View full abstract»

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  • An Analysis of Polyphase Envelope Detection

    Publication Year: 1973, Page(s):967 - 969
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (288 KB)

    When the ratio of the frequency of the carrier to that of the modulating signal becomes less than approximately 10:1, AM detectors become unable to detect the impressed modulation in a satisfactory manner. Distortion due to transient charging and discharging phenomena in the diode circuit during detection of wide-band AM signals has imposed limitations on channel capacity in AM and FM wide-band mu... View full abstract»

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  • On Optimal Routing Through Communication Nets

    Publication Year: 1973, Page(s):936 - 941
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (608 KB)

    This paper describes a procedure for a suboptimal routing of simultaneous multiterminal multicommodity flows in circuit switched communication networks. The procedure is based on a concept of topological importance of a branch in a capacitated net with a given structure and relative to a given pattern of communication requirements. Once these importance weights have been attached to the branches o... 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
Naofal Al-Dhahir
University of Texas at Dallas