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Communications, Radar and Signal Processing, IEE Proceedings F

Issue 4 • Date June 1983

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Displaying Results 1 - 13 of 13
  • Quality rating of television pictures: comparison of results obtained by laboratories in different countries

    Publication Year: 1983, Page(s):289 - 295
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (850 KB)

    The participation of five European countries in preliminary experiments with methods of television subjective testing, intended for application to a 2 Mbit/s codec, has provided the first opportunity for comparing results obtained by different organisations using a single-stimulus full-range quality-rating method under fairly well standardised conditions. The range in standards of subjective judgm... View full abstract»

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  • Simple M-factor algorithm for improved estimation of the basic maximum usable frequency of radio waves reflected from the ionospheric F-region

    Publication Year: 1983, Page(s):296 - 302
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (703 KB)

    The equations of Milsom are evaluated, giving the ground range and group delay of radio waves propagated via the horizontally stratified model ionosphere proposed by Bradley and Dudeney. Expressions for the ground range which allow for the effects of the underlying E- and F1-regions are used to evaluate the basic maximum usable frequency or M-factors for single F-layer hops. An algorithm for the r... View full abstract»

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  • Adaptive canceller for elevation angle estimation in the presence of multipath

    Publication Year: 1983, Page(s):303 - 308
    Cited by:  Papers (5)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (625 KB)

    The paper describes a new adaptive canceller for estimating the elevation angle in a low-angle tracking radar environment in the presence of specular and diffuse multipath. The adaptation is achieved using the complex least-mean-squares (LMS) algorithm. Computer-simulation results are included to demonstrate the usefulness of this scheme for estimating the elevation angle when it is a small fracti... View full abstract»

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  • Spectral response of the discrete cosine and Walsh-Hadamard transforms

    Publication Year: 1983, Page(s):309 - 313
    Cited by:  Papers (6)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (509 KB)

    It is becoming increasingly popular, when considering transform coding schemes for images, to attempt to take the spatial frequency response of the human observer into account by performing a classical one- or two-dimensional filtering (pre-emphasis) operation upon the coefficients of the Fourier transformed image, and it would be advantageous if such a procedure could be carried out with more com... View full abstract»

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  • Computer generation of a slowly varying pseudorandom process

    Publication Year: 1983, Page(s):314 - 316
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (366 KB)

    The paper illustrates a computer modelling method for the generation of a highly correlated pseudorandom process with a desired power density spectrum. The samples of the pseudorandom process are generated as the output of a cascade connection of a correlation shaping transversal filter and a reconstruction filter with statistically independent samples fed to the input. Such a generation method ne... View full abstract»

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  • Comparison of the bistatic cross-section and reflectivities of spherical and spheroidal raindrops at microwave frequencies

    Publication Year: 1983, Page(s):317 - 324
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (815 KB)

    In the paper we investigate one aspect of the validity of models currently used to calculate rainscatter interference in radio and satellite communication systems. Exact bistatic scattering cross-sections from spheroidal shaped raindrops are compared with those obtained from spheroids in the Rayleigh approximation and from spheres using the Mie theory at 11.7, 20 and 30 GHz. Comparisons are also m... View full abstract»

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  • Net coding gain of some rate 1/2 block codes

    Publication Year: 1983, Page(s):325 - 330
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (616 KB)

    Using the concept of net coding gain (NCG), we measure the benefits of using a class of rate 1/2 codes in error control systems. A bounded distance decoder for group codes is assumed. The NCG can be compared with other expedients such as increasing transmitted signal power. Although the codes are used in conjunction with phase and frequency modulation systems, the technique is valid for any binary... View full abstract»

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  • Performance of a two-stage nonparametric conditional detector for Rician density

    Publication Year: 1983, Page(s):331 - 336
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (593 KB)

    A two-stage four-level conditional detector is described. The detector is a constant-false-alarm-rate detector. Its performance is compared with that of a single-stage (fixed-sample-size) four-level conditional detector. In a finite-sample comparison the noise is assumed to have a Rician probability density function, which is the probability density function of the output of an envelope detector i... View full abstract»

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  • Application of catastrophe theory to a slotted ALOHA communication system

    Publication Year: 1983, Page(s):337 - 342
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (684 KB)

    Catastrophe theory is used to analyse the behaviour of a slotted ALOHA data communication system with the aim of demonstrating the power of catastrophe theory for the study of communication systems in general. A brief introduction to the required aspects of catastrophe theory is given, followed by detailed numerical and qualitative results of their application to slotted ALOHA. View full abstract»

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  • Delay analysis of a satellite channel reservation system with variable frame format

    Publication Year: 1983, Page(s):343 - 349
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (697 KB)

    The paper deals with a satellite channel reservation system with variable frame format. The operating scheme of the system is as follows. The current queue length at each user is reported through minislots in the up-link header to a satellite having processing capability. The satellite broadcasts slot assignments for transmission in the next frame to users through the down-link header, based on th... View full abstract»

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  • Minimisation of intermodulation interference

    Publication Year: 1983, Page(s):350 - 355
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (547 KB)

    In the paper a recurrence formula is developed which is used to generate frequency lists free from third- and fifth-order intermodulation products. The mathematical analysis is given in an Appendix. View full abstract»

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  • Chaff

    Publication Year: 1983, Page(s):355 - 356
    IEEE is not the copyright holder of this material | PDF file iconPDF (249 KB)
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  • Reply: Chaff

    Publication Year: 1983
    IEEE is not the copyright holder of this material | PDF file iconPDF (122 KB)
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Aims & Scope

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

Full Aims & Scope