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Communications, Radar and Signal Processing, IEE Proceedings F

Issue 5 • Date August 1984

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Displaying Results 1 - 20 of 20
  • Derivation of impulse responses under minimum phase constraints

    Publication Year: 1984 , Page(s): 425 - 432
    Click to expandAbstract | PDF file iconPDF (951 KB)  

    The paper describes several methods of deriving minimum phase impulse response functions given only the amplitude frequency characteristics. The suitability of these methods for use in digital transmission system analysis is considered. View full abstract»

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  • Relative performance of a simple MTI canceller selection rule

    Publication Year: 1984 , Page(s): 433 - 436
    Click to expandAbstract | PDF file iconPDF (404 KB)  

    The performance of an MTI canceller selection rule, which is solely based on clutter suppression, is analysed in terms of incorrect selection probability and average loss in signal-to-interference ratio (SIR). It is concluded that the variation in target signal power transfer, as a function of the target radial velocity, is responsible for most incorrect canceller choices. The resulting loss in SI... View full abstract»

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  • The performance of combined feedforward AGC and phase-locked AFC in a single sideband mobile radio receiver

    Publication Year: 1984 , Page(s): 437 - 441
    Click to expandAbstract | PDF file iconPDF (528 KB)  

    The paper describes the results of a simulation of a coupled phase-locked AFC/feedforward AGC system with a two tone fading input. The theoretical predictions agree closely with those obtained under laboratory conditions, and show that considerable care should be exercised in the selection of the phase-locked loop bandwidth, normalised to twice maximum Doppler (¿n/2¿d). Failure to do so can resu... View full abstract»

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  • 14/11 GHz, 120 Mbit/s regenerative satellite transponder

    Publication Year: 1984 , Page(s): 442 - 450
    Click to expandAbstract | PDF file iconPDF (1170 KB)  

    This paper describes the design, implementation and performance of an experimental 14/11 GHz, 120 Mbit/s regenerative satellite transponder for possible use in the European communications satellite (ECS) system. Quarternary DPSK and CPSK are applied on the uplink and downlink, respectively. Demodulation and modulation are performed directly at RF. Specific components of the regenerative transponde... View full abstract»

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  • Nonlinear polarisation-vector translation in radar systems

    Publication Year: 1984 , Page(s): 451 - 465
    Click to expandAbstract | PDF file iconPDF (1821 KB)  

    With current technology, the real-time implementation of a multinotch logic-product (MLP) polarisation suppression filter which covers only a moderate area in polarisation space can only be realised as a rather bulky piece of hardware (typically with more than 61 notches). This has led to the development of the concept of nonlinear polarisation-vector translation (PVT), which allows the number of ... View full abstract»

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  • Transform coding of images using interleaved blocks

    Publication Year: 1984 , Page(s): 466 - 472
    Cited by:  Papers (5)
    Click to expandAbstract | PDF file iconPDF (926 KB)  

    A method of coding images based on interleaved blocks is proposed. These block have irregular outlines with both holes and islands. It is shown that if they are designed by the application of `n-cycles¿¿ to a rectangular array, the resulting block shapes interleave perfectly without overlap. Used in transform coding, they substantially reduce the visiblity of block structure at low data rates. Exp... View full abstract»

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  • Application of gradient adaptive lattice filters to channel equalisation

    Publication Year: 1984 , Page(s): 473 - 479
    Click to expandAbstract | PDF file iconPDF (872 KB)  

    In this paper, the potential application of adaptive lattice equalisers based on gradient search adaptive algorithms, is examined. The assessment is based on simulations of equaliser performance in data communications systems which provides a comparison of the relative performance of these adaptive lattice equalisers with transversal equalisers. It highlights the critical balance between rapid con... View full abstract»

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  • Optimum MSK-type receivers for CPM on Gaussian and Rayleigh fading channels

    Publication Year: 1984 , Page(s): 480 - 490
    Cited by:  Papers (23)
    Click to expandAbstract | PDF file iconPDF (1153 KB)  

    Power efficient schemes with excellent power spectra are contained among the continuous phase modulation (CPM) schemes. This is a constant envelope digital modulation technique, which in general requires a maximum-likelihood sequence detector (Viterbi detector) for efficient detection. This optimum receiver is sometimes complex. In this paper a parallel MSK-type receiver is studied. It is useful f... View full abstract»

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  • Performance of space-based radar in the presence of earth clutter

    Publication Year: 1984 , Page(s): 491 - 500
    Cited by:  Papers (1)
    Click to expandAbstract | PDF file iconPDF (1218 KB)  

    The paper presents some general principles related to the performance of a space-based radar (SBR) using pulse Doppler to suppress the earth clutter. These principles are developed using a heuristic description of clutter as seen from a space-based radar, and illustrated by means of a case study. It is demonstrated that SBR performance varies with look direction and that clear areas exist in the c... View full abstract»

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  • Evaluation of a site diversity model for satellite communications systems

    Publication Year: 1984 , Page(s): 501 - 506
    Click to expandAbstract | PDF file iconPDF (779 KB)  

    Site diversity is one method for reducing rain outages on earth-satellite communications links. A previously proposed prediction model for dual-site diversity, based on simple meteorological concepts that relate diversity performance to single-path rain attenuation, is evaluated against a compilation of 23 measured data sets. Prediction errors for the model are established and then discussed in te... View full abstract»

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  • Inexpensive multipurpose airborne surveillance radar

    Publication Year: 1984 , Page(s): 507 - 516
    Cited by:  Papers (1)
    Click to expandAbstract | PDF file iconPDF (2120 KB)  

    Airborne radar has now been in operation for over 40 years, and nose-mounted microwave equipment is fitted to the majority of civil passenger jets for the early detection and subsequent avoidance of severe storm centres. The ground-mapping and sea-search equipment described here provides a high-quality operator PPI display without the expense of either a special cosec2 aerial or a stabilised aeria... View full abstract»

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  • Analogue adaptive hybrid for digital transmission on subscriber lines

    Publication Year: 1984 , Page(s): 517 - 525
    Cited by:  Papers (2)
    Click to expandAbstract | PDF file iconPDF (724 KB)  

    Duplex transmission of digital signals on the single-pair subscriber line is possible if the signals in the two directions are sufficiently separated. An analogue adaptive hybrid is one method of signal separation. We discuss here the theory of analogue adaptive hybrids. We present a model for the system and the adaptive hybrid, and show the result of simulation. The parameters of the adaptive hyb... View full abstract»

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  • Adaptive adjustment of receiver for distorted digital signals

    Publication Year: 1984 , Page(s): 526 - 536
    Cited by:  Papers (1)
    Click to expandAbstract | PDF file iconPDF (1594 KB)  

    The paper presents the results of an initial feasibility study into a novel technique for the adaptive adjustment of the receiver in a digital data-transmission system, operating with additive noise and severe inter-symbol interference in the received signal. The technique is an iterative process and can be used for the adjustment of the linear feedforward transversal filter that is employed ahead... View full abstract»

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  • Predictive entropy coding for speech analysis

    Publication Year: 1984 , Page(s): 537 - 541
    Click to expandAbstract | PDF file iconPDF (596 KB)  

    Entropy coding using codes with a simple structure is used in connection with predictive coding to reduce the transmission rate. The predictive coder uses a quantiser with a large number of levels to minimise the effects of slope overload. An adaptive quantising scheme is used to maintain system operation at a point that yields a minimum redundancy. Experimental results on speech coding show that ... View full abstract»

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  • Adaptive differential pulse-code modulation with adaptive bit allocation

    Publication Year: 1984 , Page(s): 542 - 548
    Click to expandAbstract | PDF file iconPDF (905 KB)  

    A new method of speech coding is described. The method, which is referred to as adaptive differential pulse-code modulation with adaptive bit allocation (ADPCM-AB), is a combination of adaptive differential pulse-code modulation with adaptive first-order prediction and switched pre-emphasis and adaptive bit allocation. The adaptive bit allocation technique is based on the short-term variation of t... View full abstract»

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  • Weibull-distributed weather clutter in the frequency domain

    Publication Year: 1984 , Page(s): 549 - 552
    Click to expandAbstract | PDF file iconPDF (299 KB)  

    It is shown that Weibull-distributed weather clutter obeys a Weibull distribution after processing by the Discrete Fourier Transform (DFT). Thus the new Weibull CFAR detector should be considered to suppress such clutter in the frequency domain. View full abstract»

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  • A two-dimensional discrete convolution algorithm

    Publication Year: 1984 , Page(s): 553 - 558
    Click to expandAbstract | PDF file iconPDF (781 KB)  

    A theoretical result concerning the discrete Fourier transform is derived and used to develop a transform algorithm for computing two-dimensional convolutions. The use of this algorithm minimises the number of arithmetic operations and the memory requirements in computing a convolution of order (M¿¿N) using a transform processor or program designed for a length No, where M¿¿N0 and N¿¿N0.It is part... View full abstract»

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  • IEE colloquium reports IEE Colloquium on Digital television techniques

    Publication Year: 1984 , Page(s): 558 - 559
    PDF file iconPDF (301 KB)  
    Freely Available from IEEE
  • IEE Colloquium on Digitalisation of the TV receiver

    Publication Year: 1984
    PDF file iconPDF (164 KB)  
    Freely Available from IEEE
  • Book review: Digital Communications Satellite/Earth Station Engineering

    Publication Year: 1984
    PDF file iconPDF (102 KB)  
    Freely Available from IEEE

Aims & Scope

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

Full Aims & Scope