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Communications, Radar and Signal Processing, IEE Proceedings F

Issue 1 • Date February 1984

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Displaying Results 1 - 17 of 17
  • Editorial

    Publication Year: 1984
    IEEE is not the copyright holder of this material | PDF file iconPDF (164 KB)
    Freely Available from IEEE
  • Hybrid intraframe transform coding of image data

    Publication Year: 1984, Page(s):2 - 6
    Cited by:  Papers (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (518 KB)

    To reduce the computational requirement which two-dimensional transform coding imposes it is common to combine the one-dimensional form of the process with simple previous-element predictive coding with an assumed fixed value of predictor coefficient for all coefficients. The underlying assumptions of this approach are here examined both theoretically and with reference to experimental data obtain... View full abstract»

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  • On the computation of discrete fourier transform using fermat number transform

    Publication Year: 1984
    Cited by:  Papers (3)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (966 KB)

    In the paper the results of a study using Fermat number transforms (FNTs) to compute discrete Fourier transforms (DFTs) are presented. Eight basic FNT modules are suggested and used as the basic sequence lengths to compute long DFTs. The number of multiplications per point is for most cases not more than one, whereas the number of shift-adds is approximately equal to the number of additions in the... View full abstract»

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  • Qpsk-direct-phase regenerator with imperfect reference carrier

    Publication Year: 1984, Page(s):15 - 18
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (440 KB)

    The paper examines the performance of a direct-phase regenerator (DPR) with imperfect reference carrier employed in a two-link coherent quarternary phase-shift-keyed (CQPSK) communication system. Additive Gaussian noise (AGN) corrupts the signal at the input to the DPR and the coherent receiver. The referencecarrier phase error is assumed to have a Tikhonov probability distribution, but otherwise ... View full abstract»

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  • Extension of maximum entropy spectral analysis. Part 1: The inclusion of prior information

    Publication Year: 1984, Page(s):19 - 24
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (632 KB)

    It is shown that, in situations where part of a correlation function can be predicted, it is possible to include this knowledge when forming a spectrum. The proposed method only requires the form of the known correlation function to be available. The method is an extension of the usual maximum entropy method, but it is demonstrated that it is possible to achieve good resolution in poor signal/nois... View full abstract»

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  • Extension of maximum entropy spectral analysis. Part 2: Interpretation and application of the method

    Publication Year: 1984, Page(s):25 - 31
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (645 KB)

    The maximum entropy method for spectral analysis is extended by assuming part of the spectrum to be known, a priori. It is shown that the extended method is still consistent with the Jaynes principle of maximising the entropy of the process. An example is included which demonstrates that the extended method produces improved results, even when incomplete background spectral information is assumed. View full abstract»

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  • Correlation systems in radio astronomy and related fields

    Publication Year: 1984, Page(s):32 - 39
    Cited by:  Papers (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1139 KB)

    A comprehensive review of the theory and practice of analogue and digital correlation systems used in radio astronomy and its related fields is given. The correlators are discussed according to the following classifications: analogue, amplitude-limited, Stieltjes (or random reference), relay, modified relay, polarity coincidence, modified polarity coincidence, and multilevel correlators. The expec... View full abstract»

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  • Error patterns in correlators with four-level quantisation

    Publication Year: 1984, Page(s):40 - 46
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (780 KB)

    In the evaluation of the analogue correlation from the digital correlation of coarsely quantised Gaussian signals, it is necessary to know the threshold levels used in the quantisation. The formulas used in the evaluation normally assume that the levels are accurate and stable. In this paper, errors in digital correlation arising from threshold variations of ¿¿2%, ¿¿5% and ¿¿10% are evaluated for ... View full abstract»

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  • Zero-crossing-based approximate demodulation of wide-deviation FM

    Publication Year: 1984, Page(s):47 - 51
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (460 KB)

    A zero-crossing-based approximate realtime demodulator is described. Output digital samples, generated through linear interpolation of a suitably approximated piecewise linear model of the modulating signal, are passed through an usual reconstruction filter to recover the original modulating signal. Details of a simple microprocessor-based implementation of the demodulator are presented along with... View full abstract»

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  • Linear unequal error locating codes (UEL codes)

    Publication Year: 1984, Page(s):52 - 56
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (548 KB)

    This paper introduces a new class of codes that have been called `unequal error locating codes¿. These codes are basically error locating codes but are studied by considering error patterns of various magnitudes lying in different sub-blocks of unequal lengths of the block length of a code. Lower and upper bounds on the number of parity-check digits required for such codes are derived. First, the... View full abstract»

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  • Transform approach to split-band coding schemes

    Publication Year: 1984, Page(s):57 - 63
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (894 KB)

    A novel approach to split-band systems for speech-coding applications is proposed and evaluated. This differs from the conventional filter-bank implementation of sub-band coding (SBC) in that a blocktransform method is employed to perform the spectral analysis and synthesis. It is shown that substantial savings in terms of system delay and complexity can be achieved using this approach. View full abstract»

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  • Figures of merit for VLSI implementations of digital signal processing algorithms

    Publication Year: 1984, Page(s):64 - 70
    Cited by:  Papers (23)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (816 KB)

    The advent of digital VLSI technology demands a reappraisal of the most suitable algorithms for a given processing function. A cost function is developed for making quantitative comparisons between digital algorithm implementations including control and overheads. This provides a tool allowing different implementations of the same algorithm, and also different algorithms for the same function, to ... View full abstract»

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  • Graph-theoretic approach to composite-source-model estimation for image coding

    Publication Year: 1984, Page(s):71 - 79
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1197 KB)

    Random processes of considerable importance in signal processing often exhibit short-term stationary statistical attributes although in the long term they appear to behave in a nonstationary manner. Image signals belong to this category. In this work we introduce a class of composite-source models as a means of representing consistently signals of this nature. A composite likelihood function is de... View full abstract»

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  • Performance of M-ary feedback communication systems

    Publication Year: 1984, Page(s):80 - 86
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (741 KB)

    An M-ary decision feedback communication system with the MAP strategy is investigated. The performance of this system is analytically evaluated as follows. First, an approximate lower performance bound is found by means of the Cauchy inequality. Then an approximate lower performance bound is found by means of the Jensen inequality. Finally, the bounds are compared and found to coincide, yielding a... View full abstract»

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  • Experiment with spread spectrum modulation on an HF channel

    Publication Year: 1984, Page(s):87 - 91
    Cited by:  Papers (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (756 KB)

    The performance of any given modulation on high-frequency channels reflected from the ionosphere will depend on the attenuation and time-frequency dispersion representative for the propagation medium. Spread-spectrum modulation has the basic function of spreading an information carrying signal over a very wide bandwidth. The ionospheric mode will, however, tend to limit the maximum useful bandwidt... View full abstract»

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  • Advanced domestic digital satellite communications systems experiments

    Publication Year: 1984, Page(s):92 - 98
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1152 KB)

    The characteristics of advanced digital transmission systems were measured using newly developed small earth stations and a K-band (30/20 GHz) and C-band (6/4 GHz) communication satellite. Satellite link performance for data, facsimile, video and packet switching information transmission at bit rates ranging from 6.4 kbit/s to 6.3 Mbit/s have been confirmed, using a small K-band (30/20 GHz) earth ... View full abstract»

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  • IRSI 83¿International Radar Symposium India

    Publication Year: 1984
    IEEE is not the copyright holder of this material | PDF file iconPDF (341 KB)
    Freely Available from IEEE

Aims & Scope

The latest version of this title is Radar, Sonar & Navigation, IET.

Full Aims & Scope