Publications

Cucchiara, R, Di Stefano, L, Piccardi, M & Cinotti, TS 1997, 'The GIOTTO System: a Parallel Computer for Image Processing', Real-Time Imaging, vol. 3, no. 5, pp. 343-353.
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This paper presents the GIOTTO system, a parallel computer based on a scalable single instruction, multiple data (SIMD) array of processors specially conceived for image processing, The system is characterized by a reduced-size array and a novel organiza

Fu, K, Guo, YJ & Barton, SK 1997, 'Performance of the EY-NPMA Protocol', Wireless Personal Communications, vol. 4, no. 1, pp. 41-50.
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The throughput of the Elimination Yield Non-pre-emptive Priority Multiple Access (EY-NPMA) protocol, which has been chosen as the medium access control (MAC) protocol for HIPERLAN, is simulated. Connection between users is based on a statistical model of path loss with power law against distance and 6 dB log-normal shadowing. It is shown that the throughput performance of the EY-NPMA protocol in networks of moderate size and with small proportion of hidden nodes is satisfactory. For a fully connected network, the throughput reaches 0.85 at an offered traffic of 1 and remains at this level. The maximum throughput reduces gradually when the number of hidden node pairs in the network is increased. With 11% of hidden nodes in the network the peak throughput falls to 0.6.

Gillies, DAG, Guo, YJ & Barton, SK 1997, 'Synchronisation Techniques for HIPERLAN', Wireless Personal Communications, vol. 4, no. 1, pp. 1-10.
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Timing recovery in the High Performance Radio Local Area Network (HIPERLAN) standard is likely to be performed with the aid of synchronisation sequences embedded in the user data, which will be detected with matched filters. A directed search using a form of genetic algorithm has been performed to obtain suitable sequences of lengths up to 80 bits, and simulations of their performance have been undertaken. Performance of the sequences has been measured under the severe channel conditions that pertain in the indoor environment.

Guo, YJ, Paez, A, Sadeghzadeh, RA & Barton, SK 1997, 'A circular patch antenna for radio LAN's', IEEE Transactions on Antennas and Propagation, vol. 45, no. 1, pp. 177-178.
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Jian Zhang, Frater, MR, Arnold, JF & Percival, TM 1997, 'MPEG 2 video services for wireless ATM networks', IEEE Journal on Selected Areas in Communications, vol. 15, no. 1, pp. 119-128.
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Audio-visual and other multimedia services are seen as an important source of traffic for future telecommunications networks, including wireless networks. In this paper, we examine the impact of the properties of a 50 Mb/s asynchronous transfer mode (ATM

Piccardi, M, Cucchiara, R, Bariani, M & Mello, P 1997, 'Exploiting symbolic learning in visual inspection', Advances In Intelligent Data Analysis, vol. 1280, pp. 223-234.
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The paper describes the use of data analysis techniques in the computer-vision inspection of industrial workpieces. Computer-vision inspection aims at accomplishing quality verification of fabricated parts by means of automated visual procedures. Gatheri

Cucchiara, R, Callipo, A & Piccardi, M 1970, 'Block processing on multiprocessor DSPs for multimedia applications', Proceedings of First Signal Processing Society Workshop on Multimedia Signal Processing, First Signal Processing Society Workshop on Multimedia Signal Processing, IEEE, PRINCETON, NJ, pp. 439-444.
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Cucchiara, R, Piccardi, M, Bariani, M & Mello, P 1970, 'Learning for feature selection and shape detection', Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics), Springer Berlin Heidelberg, pp. 535-542.
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© Springer-Verlag Berlin Heidelberg 1997. The paper proposes a general framework for shape detection based on supervised symbolic learning. Differently from other visual systems exploiting machine learning, the proposed architecture does not follow the object segmentation - feature extraction and (learning based) classification approach. Instead, an initial data-driven processing selects points of interest in the scene by means of complex features which hypothesize the presence of the target shape; hypotheses are validated by a classifier defined by a machine learning algorithm. Learning is exploited not only for defining the model, i.e. the description of the target for the classifier, but also for defining the description language, i.e. the feature set useful in generating reliable object hypotheses. The proposed architecture of visual system has been implemented for an industrial application of unstructured shape detection: examples and results are reported in the paper.

Guerin, S, Guo, YJ & Barton, SK 1970, 'Indoor propagation measurements at 5 GHz for HIPERLAN', IEE Conference Publication.
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Indoor propagation measurements for HIPERLAN at 5 GHz are reported. Using two patch antennas designed for HIPERLAN, one being fixed at the ceiling of a meeting room and the other being moved around in the room, the path loss, delay profiles and delay parameters are obtained. The effect of multiple reflection is demonstrated by the direction of arrival (DOA) measurements.

Horwitz, M & Braun, R 1970, 'A generalised design technique for traceback survivor memory management in Viterbi decoders', Proceedings of the 1997 South African Symposium on Communications and Signal Processing. COMSIG '97, 1997 South African Symposium on Communications and Signal Processing. COMSIG '97, IEEE, RHODES UNIV, GRAHAMSTOWN, SOUTH AFRICA, pp. 63-68.
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Ince, EA, Guo, YJ & Barton, SK 1970, 'T-algorithm detection of partial response continuous phase modulated signals over multipath channels', IEEE International Symposium on Personal, Indoor and Mobile Radio Communications, PIMRC, pp. 1135-1139.
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This paper presents a new approach to reduced complexity detection of partial response continuous phase modulated signals over channels with severe intersymbol interference (ISI). The detector combines the overall channel response for the CPM modulator with that of a multipath channel to calculate the branch metrics of a breadth-first sequential detection algorithm known as the T-algorithm. To our knowledge the reported work is the first attempt to make use of such a technique for equalization of quaternary partial response CPM signals transmitted over multipath channels. Simulation of the performance of the receiver in multipath channels is reported.

Ince, EA, Vorizanakis, N, Guo, YJ & Barton, SK 1970, 'Breadth-first sequential detection of PR-CPM signals over AWGN and multipath channels', Proceedings of IEEE International Symposium on Information Theory, IEEE International Symposium on Information Theory, IEEE, pp. 496-496.
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Detection of partial response continuous phase modulated signals over AWGN and multipath channels is presented. The receiver uses a breadth-first sequential detection algorithm known as the M-algorithm (MA). Compared with the maximum likelihood receiver based on the Viterbi algorithm (VA), a significant reduction in complexity is obtained in the proposed receiver while maintaining good performance. © 1997 IEEE.

Jian Zhang, Arnold, JF, Frater, MR & Pickering, MR 1970, 'Video error concealment using decoder motion vector estimation', TENCON '97 Brisbane - Australia. Proceedings of IEEE TENCON '97. IEEE Region 10 Annual Conference. Speech and Image Technologies for Computing and Telecommunications (Cat. No.97CH36162), TENCON '97 Brisbane - Australia IEEE TENCON '97 IEEE Region 10 Annual Conference. Speech and Image Technologies for Computing and Telecommunications, IEEE, QUEENSLAND UNIV TECHNOL, BRISBANE, AUSTRALIA, pp. 777-780.
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Tellambura, C, Guo, YJ & Barton, SK 1970, 'Noniterative approach for computing linear equaliser tap weights', IEEE International Symposium on Personal, Indoor and Mobile Radio Communications, PIMRC, pp. 302-306.
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A fast computation method for the tap weights of a linear equaliser is developed. By approximating the channel autocorrelation matrix, which has a Toeplitz structure, by a circulant matrix, the tap weights can be solved via discrete fourier transform (DFT) techniques. For an equaliser with N taps, the approximate tap weights approach the exact tap weights as N → ∞. Excess mean-square error and bit error rate (BER) degradation caused by the approximate tap weights are computed for a representative channel.

Tellambura, C, Johnson, IR, Guo, YJ & Barton, SK 1970, 'Equalization and frequency offset correction for HIPERLAN', IEEE International Symposium on Personal, Indoor and Mobile Radio Communications, PIMRC, pp. 796-800.
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To reduce the effects of inter-symbol interference resulting from the dispersive nature of the indoor radio channel most HIPERLAN receivers will incorporate an adaptive equalizer. In this paper, computational complexity of several equalizer algorithms is estimated. The effect of frequency offset between transmitter and receiver on the performance of such an equalizer is investigated. By employing a decision feedback equalizer incorporating a second order phase locked loop, the effect of both the intersymbol interference and frequency offset can be significantly reduced. Using such a technique, the packet error ratio (PER) of a HIPERLAN radio link in a multipath channel is found by simulation.

Whaits, CV & Braun, RM 1970, 'Phase errors in the coherent demodulation of VPSK and a solution using DSSS modulation', Proceedings of the 1997 South African Symposium on Communications and Signal Processing. COMSIG '97, 1997 South African Symposium on Communications and Signal Processing. COMSIG '97, IEEE, RHODES UNIV, GRAHAMSTOWN, SOUTH AFRICA, pp. 107-110.
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