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IEEE Transactions on Communications

Issue 7 • Date July 1984

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Displaying Results 1 - 19 of 19
  • [Front cover and table of contents]

    Publication Year: 1984, Page(s): 0
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    Freely Available from IEEE
  • [Back cover]

    Publication Year: 1984, Page(s): 0
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    Freely Available from IEEE
  • Network Design for a Large Class of Teleconferencing Systems

    Publication Year: 1984, Page(s):789 - 796
    Cited by:  Papers (8)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (992 KB)

    This paper introduces a new class of network design problems implementing an integrated teleconferencing environment consisting of a video space showing images of the participants, an audio space providing their voices, and a graphics space providing reference and discussion material for the conference. These various spaces provide services of differing quality and type. The problem posed is to de... View full abstract»

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  • Decimations of the Frank-Heimiller Sequences

    Publication Year: 1984, Page(s):851 - 853
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (336 KB)

    The Frank-Heimiller sequence of period N2with ... View full abstract»

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  • Noise Reduction in Image Sequences Using Motion-Compensated Temporal Filtering

    Publication Year: 1984, Page(s):826 - 831
    Cited by:  Papers (90)  |  Patents (40)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (936 KB)

    Noise in television signals degrades both the image quality and the performance of image coding algorithms. This paper describes a nonlinear temporal filtering algorithm using motion compensation for reducing noise in image sequences. A specific implementation for NTSC composite television signals is described, and simulation results on several video sequences are presented. This approach is shown... View full abstract»

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  • Multiplierless Implementations of MF/DTMF Receivers

    Publication Year: 1984, Page(s):839 - 847
    Cited by:  Papers (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (688 KB)

    The ever-increasing use of VLSI in telecommunications systems is leavening the search of new algorithms for task realizations suited to VLSI implementations of systems. Toward this search, the paper presents implementations for MF/DTMF receivers, which are based on multiplierless basic filters or primitive VLSI cells such as (1 + z^{-n}) , View full abstract»

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  • TSI-OQPSK for Multiple Carrier Satellite Systems

    Publication Year: 1984, Page(s):818 - 825
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (600 KB)

    The performance of TSI-OQPSK (two-symbol-interval-offset QPSK) modems in nonlinearly amplified (saturated or hard-limited), adjacent channel interference (ACI) satellite earth station environment is studied. In closely spaced mobile satellite channels and higher frequency (≥ 14 GHz) earth stations, the effect of ACI on the P_{e} = f(E_{b}/N_{0}) perfor... View full abstract»

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  • On M-ary DPSK Transmission Over Terrestrial and Satellite Channels

    Publication Year: 1984, Page(s):752 - 761
    Cited by:  Papers (9)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (864 KB)

    The error rate performance of M -ary DPSK systems is investigated in the presence of phase change offset, noise correlation, and power imbalance. Both the terrestrial channel and the hard-limiting satellite repeater channel are considered. In the satellite repeater case, the noise correlations and power imbalances are assumed to be present on both the up- and d... View full abstract»

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  • A Two-Power-Level Method for Multiple Access Frequency-Hopped Spread-Spectrum Communication

    Publication Year: 1984, Page(s):853 - 855
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (304 KB)

    This paper suggests a technique applicable to chip-synchronous frequency-hopping MFSK multiaccess communication whereby each user has some high-power-level slots and some low-power-level slots. The optimum proportion of high-power slots is slightly less than 1/e where e is the natural logarithm base. For this optimum propo... View full abstract»

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  • Interference Cancellation System for Satellite Communication Earth Station

    Publication Year: 1984, Page(s):796 - 803
    Cited by:  Papers (3)  |  Patents (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (784 KB)

    A new interference cancellation system was devised to suppress the mutual interference between satellite and terrestrial communication systems and to expand the number of potential earth station locations for effective frequency reuse. This system basically adopts the sidelobe canceller concept and has main and auxiliary antennas. The originality of this system lies in that the auxiliary channel s... View full abstract»

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  • The Effectiveness and Efficiency of Hybrid Transform/DPCM Interframe Image Coding

    Publication Year: 1984, Page(s):832 - 838
    Cited by:  Papers (5)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1048 KB)

    We seek to evaluate the efficiency of hybrid transform/ DPCM interframe image coding relative to an optimal scheme that minimizes the mean-squared error in encoding a stationary Gaussian image sequence. The stationary assumption leads us to use the asymptotically optimal discrete Fourier transform (DFT) on the full frame of an image. We encode an actual image sequence with full-frame DFT/DPCM at s... View full abstract»

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  • Performance of Portable Radio Telephone Using Spread Spectrum

    Publication Year: 1984, Page(s):762 - 768
    Cited by:  Papers (2)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (712 KB)

    A 2 GHz band portable radio telephone has been fabricated using the spread-spectrum technique. We describe the fundamental performance, bit error rates with and without interference, measured using the experimental telephone. The telephone system's user density is estimated by computer simulation under relatively realistic conditions. View full abstract»

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  • A One-Stage Look-Ahead Algorithm for Delta Modulators

    Publication Year: 1984, Page(s):861 - 863
    Cited by:  Papers (4)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (256 KB)

    This paper describes a one-stage look-ahead algorithm for adaptive delta modulators. The algorithm does not require the calculation of two encoding paths nor does it require the decision circuitry to choose the optimum path. View full abstract»

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  • Preemphasis/Deemphasis Effect on the Output SNR of SSB-FM

    Publication Year: 1984, Page(s):848 - 850
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (224 KB)

    The effect of preemphasis/deemphasis on the noise power output of FM detectors for SSB-FM is studied. Two cases are considered: namely, when the modulating signal is assumed to be sinusoidal and when it is a Gaussian random process. For both cases the noise is assumed to be stationary and Gaussian. For a sinusoid modulating signal, the improvement of (S/N)_{0}...
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  • Hamming Coding of DCT-Compressed Images Over Noisy Channels

    Publication Year: 1984, Page(s):856 - 861
    Cited by:  Papers (18)  |  Patents (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (848 KB)

    Theoretical and simulation results of using Hamming codes with the two-dimensional discrete cosine transform (2D-DCT) at a transmitted data rate of 1 bit/pixel over a binary symmetric channel (BSC) are presented. The design bit error rate (BER) of interest is 10-2. The (7, 4), (15, 11), and (31, 26) Hamming codes are used to protect the most important bits in each 16 by 16 transformed b... View full abstract»

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  • Random Multiple-Access Communication and Group Testing

    Publication Year: 1984, Page(s):769 - 779
    Cited by:  Papers (39)  |  Patents (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1168 KB)

    We study the application of group testing to the design of efficient algorithms for random multiple-access communication systems. Both direct transmission and reservation systems are considered for various types of channel feedback. We propose and analyze algorithms based on conventional and generalized group testing techniques. The proposed algorithms outperform TDMA and algorithms based on binar... View full abstract»

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  • Synthesis of Communicating Finite-State Machines with Guaranteed Progress

    Publication Year: 1984, Page(s):779 - 788
    Cited by:  Papers (26)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1008 KB)

    We present a methodology to synthesize two communicating finite-state machines which exchange messages over two one-directional, FIFO channels. The methodology consists of two algorithms. The first algorithm takes one machine M , and constructs two communicating machines M' and N' s... View full abstract»

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  • Unique-Word Detection in TDMA: Acquisition and Retention

    Publication Year: 1984, Page(s):804 - 817
    Cited by:  Papers (2)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1120 KB)

    Establishing frame and burst synchronism in TDMA requires detection of a known, approximately periodic signal corrupted by noise. This paper presents a Markovian modeling approach to analyzing the performance of a sync detector that repeatedly compares the output of an n -bit binary correlator to an acceptance/rejection threshold. The detector is defined to be ... View full abstract»

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  • On Optimum and Nearly Optimum Data Quantization for Signal Detection

    Publication Year: 1984, Page(s):745 - 751
    Cited by:  Papers (24)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (752 KB)

    The application of companding approximation theory to the quantization of data for detection of coherent signals in a noisy environment is considered. This application is twofold, allowing for greater simplicity in both analysis and design of quantizers for detection systems. Most computational methods for designing optimum (most efficient) quantizers for signal detection systems are iterative and... 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