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Communications, Radar and Signal Processing, IEE Proceedings F

Issue 1 • February 1988

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Displaying Results 1 - 17 of 17
  • Town crier to world seer: a broadcast odyssey

    Publication Year: 1988, Page(s):1 - 6
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1347 KB)

    A review of the development of broadcasting is given and thoughts are presented for its evolution into the 21st century. Although the terrestrial radio and television networks are unlikely to expand greatly in future, their usage may change, particularly to satisfy new interests in the broadcasting of data or information. Emphasis is placed on the importance of satellites in the next decade, for i... View full abstract»

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  • Algebraic formulation of Kumaresan-Tufts superresolution method, showing relation to ME and MUSIC methods

    Publication Year: 1988
    Cited by:  Papers (11)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (464 KB)

    The paper gives a new formulation for the Kumaresan-Tufts (KT) method for enhanced resolution with an antenna array. This formulation shows the relation of this method to the maximum-entropy (ME) method and the eigenvector projection method (MUSIC algorithm). It is shown that the eigenvector projection is a smoothed version of the KT method, and that the KT method is equivalent to the ME method if... View full abstract»

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  • Effects of correlated fading on level crossing rates and average fade durations with predetection diversity reception

    Publication Year: 1988, Page(s):11 - 17
    Cited by:  Papers (25)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (648 KB)

    General expressions for the level crossing rate (LCR) and average fade duration (AFD) are obtained for several diversity combining schemes employing two-branch predetection reception of correlated Rayleigh fading signals. These expressions are obtained from joint and conditional probability density functions (PDFs) of the received signals, and lead to a unified treatment. This simplified method co... View full abstract»

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  • Formant estimation algorithm based on pole focusing offering improved noise tolerance and feature resolution

    Publication Year: 1988, Page(s):18 - 32
    Cited by:  Papers (3)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (2064 KB)

    The ability to measure the centre frequencies of areas of resonance (formants) in the short-time power spectrum of speech is of paramount importance in the recognition of voiced speech sounds in a feature-extraction-based continuous speech recognition system. Additionally, the provision of a tracking algorithm, by which the loci of formants with respect to time can be estimated, yields formant tra... View full abstract»

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  • Near-maximum-likelihood decoding of convolutional codes

    Publication Year: 1988, Page(s):33 - 42
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1142 KB)

    The paper describes two novel decoding processes that come close to achieving maximum-likelihood decoding of convolutional codes, without, however, requiring nearly as much computation per decoded data symbol as does the Viterbi-algorithm decoder. The particular application studied is that of a bandwidth-efficient data transmission system, transmitting a rate-2/3 convolutionally coded 8PSK signal ... View full abstract»

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  • Embedded coding technique: principles and theoretical studies

    Publication Year: 1988, Page(s):43 - 50
    Cited by:  Papers (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (805 KB)

    In the paper the principles of embedded array codes, which employ a combination of forward error correction and detection (FEC/FED) for error control in an ARQ environment, are introduced. In this scheme a concatenated code with an inner code for error correction and an outer code for error detection is used. A retransmission of the erroneous information packets is requested if the outer code deco... View full abstract»

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  • Adaptive frame synchroniser for digital satellite communication systems

    Publication Year: 1988, Page(s):51 - 59
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1089 KB)

    The paper presents an analysis of the error performance of a basic frame synchroniser when noise and timing uncertainties exist. The results yield criteria for a new window width and detection threshold strategy, and a new form of frame synchroniser for digital satellite communication systems is described. It is shown that false alarms and misdetections may be minimised using the adaptive window w... View full abstract»

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  • Suboptimum adative polarisation cancellers for dual-polarisation radars

    Publication Year: 1988, Page(s):60 - 72
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1476 KB)

    In the paper some suboptimum adaptive polarisation techniques for the cancellation of partially polarised disturbances are analysed. They are based on suitable use of the estimates of the crosscorrelation between the dual-polarisation received signals. The performances of these techniques are evaluated and compared with that of the optimum setting of polarisation on reception. It is shown that the... View full abstract»

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  • Space-based radar: narrowing the main-beam clutter spectrum through the use of a high-aspect-ratio antenna

    Publication Year: 1988, Page(s):73 - 81
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (646 KB)

    With a space-based surveillance radar, the ability to detect slow-moving targets is compromised by returns from the earth's surface illuminated by the main beam of the antenna. An antenna design is presented that minimises the spectral width of main-beam earth clutter returned to space-based radars. The design maximises the aspect ratio of the antenna and aligns its long dimension with the satelli... View full abstract»

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  • State estimation of manoeuvring targets from noisy radar measurements

    Publication Year: 1988, Page(s):82 - 84
    Cited by:  Papers (4)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (312 KB)

    Analytical results for tracking manoeuvring targets from noisy radar measurements are presented. A three-dimensional mathematical model based on the Kalman filtering technique is discussed for the tracking of a manoeuvring aircraft using noisy measurements obtained from a three-dimensional radar. The measurement uncertainties and the manoeuvre characteristics are assumed to be known in polar co-or... View full abstract»

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  • Algorithm for adaptive error control system synthesis

    Publication Year: 1988, Page(s):85 - 94
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1290 KB)

    In the paper an algorithm for adaptive hybrid error control system synthesis is presented. The channel is considered as a quasistationary Gilbert model under the constraint that only transitions from one stable state into two adjoining states are possible. The states are ordered according to the decreasing error probabilities. It is also assumed that the channel error statistics are known in advan... View full abstract»

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  • Rapid acquisition scheme for spread-spectrum radio in a fading environment

    Publication Year: 1988
    Cited by:  Papers (9)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1221 KB)

    A modified two-level scheme for coarse code acquisition of spread-spectrum signals in a fading environment is considered. The scheme uses a bank of passive correlators followed by a bank of active correlators. The passive correlators are matched to short sync prefixes, which areinterspersed in the incoming signal. The passive devices correlate over sliding windows (in time), providing a rapid sear... View full abstract»

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  • Book review: Data Communications and Teleprocessing Systems

    Publication Year: 1988
    IEEE is not the copyright holder of this material | PDF file iconPDF (172 KB)
    Freely Available from IEEE
  • ENCAP-4: an OQPSK-type modulation technique for digital radio

    Publication Year: 1988, Page(s):105 - 110
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (680 KB)

    A class of OQPSK-type signals (offset quadrature phase shift keyed) is defined which generalises several well known modulation formats. These signals are generated by means of a set of encoding rules which introduce a controlled amount of correlation between the in-phase (I) andquadrature (Q) components and between signal elements in each component. These encoding rulesimply the specification of f... View full abstract»

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  • Performance data and limiting conditions of object tracking algorithms in the presence of camera noise

    Publication Year: 1988, Page(s):111 - 113
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (355 KB)

    The lower performance limits of two different object tracking algorithms relative to the camera noise, quantisation of the image signal, object size and contrast between object and back ground were determined using statistical methods. View full abstract»

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  • Correlation properties of dual-BCH, Kasami and other sequences for spread-spectrum, multiple-access systems

    Publication Year: 1988, Page(s):114 - 117
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (461 KB)

    Odd correlation functions and average interference parameters for dual-BCH, small sets of Kasami sequences and a new set of sequences are investigated. Results are presented for periods up to 255, and an investigation into the effects of choice of initial phase is included. Results indicate that the new sequences provide a level of multiple-access performance which is on average similar to other s... View full abstract»

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  • IEE Conference Publication 281 (Radar 87)

    Publication Year: 1988, Page(s):118 - 120
    IEEE is not the copyright holder of this material | PDF file iconPDF (353 KB)
    Freely Available from IEEE

Aims & Scope

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

Full Aims & Scope