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1887

IEE Proceedings F (Communications, Radar and Signal Processing)

Volume 133, Issue 3, June 1986

Volumes & issues:

Volume 133, Issue 3

June 1986

Comparison of adaptive cell-averaging detectors for multiple-target situations
  • Author(s): E.K. Al-Hussaini  and  B.M. Ibrahim
  • Source: IEE Proceedings F (Communications, Radar and Signal Processing), Volume 133, Issue 3, p. 217 –223
  • DOI:  10.1049/ip-f-1.1986.0037
  • Type: Article
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  • p. 217 –223 (7)
    Conventional cell averaging (CA), greater of (GO) and smaller of (SO) constant false alarm rate (CFAR) detectors are considered when an interfering target is present in the reference noise cells. Threshold compensation techniques used previously to improve the performance of a CA detector have been modified and generalised to include GO and SO detectors. It is shown that, using these methods, good relative improvements are obtained for the GO and CA detectors, especially for a small number of reference noise cells. Only slight relative improvements are obtained for the SO detector, however.
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Combination of cancelling intersymbol interference and decoding of error-correcting code
  • Author(s): R. Kohno ; S. Pasupathy ; H. Imai ; M. Hatori
  • Source: IEE Proceedings F (Communications, Radar and Signal Processing), Volume 133, Issue 3, p. 224 –231
  • DOI:  10.1049/ip-f-1.1986.0038
  • Type: Article
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  • p. 224 –231 (8)
    The paper proposes and investigates a new type of nonlinear adaptive canceller of intersymbol interference (ISI) called ‘ACDEC’. The ACDEC uses an automatic equaliser including a decoder of an error-correcting code (AEDEC), to obtain more reliable preliminary decisions than those by the linear equaliser used in the linear adaptive canceller of Gersho and Lim. By using the modified structure and incorporating one more decoder, the tap values of both the canceller's delay line and the adaptive matched filter are correctively updated with reduced final decision errors in the same manner as AEDEC. The theoretical calculation of the error probability in the joint repetitive scheme of both cancelling ISI and decoding indicates that two repetitions, i.e. ACDEC, can provide considerable improvement in the error probability performance in the steady state without excessive complexity of implementation. Moreover, computer simulations show that an ACDEC achieves stable convergence and exhibits better adaptability in noisy and time-varient channels.
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Erratum: Generalised crosscorrelator with data-estimated weighting function: a simulation analysis
Further analysis of bandlimited 16-ary QAM signalling in satellite channels
  • Author(s): A.H. Aghvami
  • Source: IEE Proceedings F (Communications, Radar and Signal Processing), Volume 133, Issue 3, p. 232 –235
  • DOI:  10.1049/ip-f-1.1986.0040
  • Type: Article
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  • p. 232 –235 (4)
    The paper presents a method of analysing the performance of a bandlimited 16-ary quadrature amplitude modulation(QAM) signal transmitted through a bandpass nonlinearity (BPNL), exhibiting AM-AM and AM-PM conversions, and in the presence of additive Gaussian noise (AGN) both preceding and following the BPNL. To illustrate the validity and usefulness of the technique, the symbol probability of a bandlimited 16-ary QAM signal transmitted through a typical nonlinear satellite channel is derived and computed for a four-pole Bitterworth filter as a function of various levels of the on-board travelling-wave tube (TWT) back-off from saturation and BT products. Finally, as an example, a study of the effect of increased bandlimiting on the system degradation for this communications system model is undertaken.
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Low-data-rate visual communication using cartoons: a comparison of data compression techniques
  • Author(s): J.A. Robinson
  • Source: IEE Proceedings F (Communications, Radar and Signal Processing), Volume 133, Issue 3, p. 236 –256
  • DOI:  10.1049/ip-f-1.1986.0041
  • Type: Article
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  • p. 236 –256 (21)
    An analysis of two-level picture compression techniques applied to low-resolution moving images is reported. The object is to discover the most suitable technique for visual communication at low data rates using feature-extracted ‘cartoons’. Reversible facsimile compression techniques are reviewed, then results presented to demonstrate their relative performance. In general, three-dimensional techniques prove to be most efficient, since they exploit both spatial and temporal relationships in the picture. However, the lower compression of two-dimensional coding is balanced by its superior error recovery performance, and it is therefore recommended for very low-data-rate transmision over conventional telephone lines, where error rates are high. From the tested range of 2-D and 3-D techniques, ‘relative address coding’ is most successful, being about 10% more efficient than its nearest rival, except for high-resolution pictures with little movement, where ‘block location coding’ of diffence frames shows a small advantage. Application of irreversible preprocessing improves the compression performance, but the gain is small, and requires additional processing power.
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Discrimination of radar clutter by texture analysis
Application of the principle of dyadic symmetry to the generation of orthogonal transforms
Go-back-N ARQ scheme with buffer at the receiver
Adaptive variable update rate algorithm for tracking targets with a phased array radar
  • Author(s): S.A. Cohen
  • Source: IEE Proceedings F (Communications, Radar and Signal Processing), Volume 133, Issue 3, p. 277 –280
  • DOI:  10.1049/ip-f-1.1986.0045
  • Type: Article
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  • p. 277 –280 (4)
    The analysis postulates an algorithm for adaptively varying the target-track update rate as a function of target manoeuvring. The algorithm proposes to vary the target observation time interval by an amount that tends to maintain a constant residual error. As an example, the algorithm is shown to be implemented with a two-dimensional alpha-beta filter. Simulated results are calculated for a target manoeuvre consisting of a single 90° turn. The results show that when a manoeuvre is detected, the sampling time interval can be reduced rapidly to facilitate tracking with reduceed error. After the manoeuvre, the sampling interval is increased automatically so more time can be made available to the phased array radar for other activities.
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New class of sequence sets with good auto- and crosscorrelation functions
Equivalent linear span analysis of binary sequences having an interleaved structure
  • Author(s): S. Prasad  and  L.C. Quynh
  • Source: IEE Proceedings F (Communications, Radar and Signal Processing), Volume 133, Issue 3, p. 288 –292
  • DOI:  10.1049/ip-f-1.1986.0047
  • Type: Article
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  • p. 288 –292 (5)
    A new, general method is presented to determine the equivalent linear span (ELS) of binary sequences having an interleaved or related structure. The method is based on a polynomial representation of the interleaved sequences followed by the use of the Euclid algorithm for factorisation, to yield a minimal polynomial. The degree of this minimal polynomial can be identified as the required ELS value. The method is then used here to show that the ELS values of the so-called m-like sequences and the prime and relative prime interleaved sequences, proposed recently by the authors, are quite large and compare favourably with those of the bent function sequences.
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New class of M-ary communication systems using complementary sequences
  • Author(s): I.M.I. Habbab  and  L.F. Turner
  • Source: IEE Proceedings F (Communications, Radar and Signal Processing), Volume 133, Issue 3, p. 293 –300
  • DOI:  10.1049/ip-f-1.1986.0048
  • Type: Article
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  • p. 293 –300 (8)
    A new class of M-ary communication systems is introduced in which information is transmitted using long-duration waveforms that are synthesised from complementary sequences. The signal waveforms, which are detected with a correlation receiver, are such that information can be transmitted using a baud period that is much shorter than the duration of the waveforms, without any intersymbol interference being introduced. The class of systems described have considerable potential and may well be of particular value in overcoming the effects of impulsive noise, or more general burst-type noise.
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Erratum: Performance evaluation of a 512-QAM system in distorted channels
Performance of a new class of binary communication systems
  • Author(s): I.M.I. Habbab  and  L.F. Turner
  • Source: IEE Proceedings F (Communications, Radar and Signal Processing), Volume 133, Issue 3, p. 301 –312
  • DOI:  10.1049/ip-f-1.1986.0050
  • Type: Article
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  • p. 301 –312 (12)
    A new class of M-ary communication systems has been put forward as a means of reducing the effects of impulsive noise. In the paper the performance of binary systems drawn from the new general class of M-ary systems is examined both analytically and by computer simulation. A new technique based on the use of the Euler transformation of slowly convergent alternating series is developed as an aid in the analytical evaluation of system performance. The analytical and simulation results, which are in very good agreement, show that in the prsesence of impulsive noise the new class of communications systems can exhibit a performance superior to that of a conventional system.
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IEE Colloquium report: IEE Colloquium on Twin-Channel Digital TV Sound for Terrestrial Broadcasting, Savoy Place, London, 7th January 1986
Conference report: Measurements for Telecommunication Transmission Systems—MTTS 85
Third Vacation School on the Evolving Local Telecommunications Network, to be held at Aston University, Birmingham, UK, 7th-12th September 1986

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