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1887

IEE Proceedings F (Communications, Radar and Signal Processing)

Volume 132, Issue 6, October 1985

Volumes & issues:

Volume 132, Issue 6

October 1985

Line code design for digital pulse-position modulation
An alternative formulation for an optimum beamformer with robustness capability
New method for computation of error probability in PSK systems with interference
Systolic implementations for deconvolution, DFT and FFT
  • Author(s): T. Willey ; R. Chapman ; H. Yoho ; T.S. Durrani ; D. Preis
  • Source: IEE Proceedings F (Communications, Radar and Signal Processing), Volume 132, Issue 6, p. 466 –472
  • DOI:  10.1049/ip-f-1.1985.0087
  • Type: Article
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  • p. 466 –472 (7)
    The paper presents a number of systolic configurations for computing deconvolutions and discrete Fourier transformations. Two approaches to deconvolution are considered: a time-domain approach, which is based on a systolic inversion of an associated Toeplitz matrix, generated by a wavefront propagation of the known system response, while the other approach, which is in the frequency domain, utilises systolic discrete Fourier transform (DFT) and fast Fourier transform (FFT) processors. The latter employs a systolic elevator concept, which circumvents the traditional need for global communications in the FFT. Aspects of hardware implementation and speed trade-offs are also discussed.
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Bit-level systolic array implementation of the winograd fourier transform algorithm
  • Author(s): J.S. Ward ; J.V. McCanny ; J.G. McWhirter
  • Source: IEE Proceedings F (Communications, Radar and Signal Processing), Volume 132, Issue 6, p. 473 –479
  • DOI:  10.1049/ip-f-1.1985.0088
  • Type: Article
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  • p. 473 –479 (7)
    A bit level systolic array system is proposed for the Winograd Fourier transform algorithm. The design uses bit-serial arithmetic and, in common with other systolic arrays, features nearest-neighbour interconnections, regularity and high throughput. The short interconnections in this method contrast favourably with the long interconnections between butterflies required in the FFT. The structure is well suited to VLSI implementations. It is demonstrated how long transforms can be implemented with components designed to perform a short length transform. These components build into longer transforms preserving the regularity and structure of the short length transform design.
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Code-division multiplex technique using bridge functions
Conference report: 6th Symposium on Information Theory in the Benelux (Mierlo, The Netherlands, 23rd–24th May 1985)
Near-maximum-likelihood detectors for binary signals
  • Author(s): W. Ser  and  A.P. Clark
  • Source: IEE Proceedings F (Communications, Radar and Signal Processing), Volume 132, Issue 6, p. 485 –490
  • DOI:  10.1049/ip-f-1.1985.0091
  • Type: Article
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  • p. 485 –490 (6)
    The paper studies three developments of a class of near-maximum-likelihood detection processes derived from a conventional nonlinear (decision feedback) equaliser. The new detectors are suitable for binary signals transmitted over a linear baseband channel introducing severe amplitude distortion. The complexity of the processes is not excessive, and increases approximately linearly with the delay in detection. Thus, a sufficiently large delay in detection can be employed to achieve a near-optimum tolerance to noise when the received signal has been very severely distorted. The paper describes three novel detection processes, and presents the results of computer simulation tests, comparing the tolerances to additive white Gaussian noise of various arrangements of each detector with that of the optimum detector of the given class and that of a conventional nonlinear equaliser. Three different channels are used in the tests and binary signals are transmitted in every case.
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Maximum entropy processing of band-limited spectra. Part 1: Noise-free case
Maximum entropy processing of band-limited spectra. Part 2: Recovering a spectrum from noisy measurements
Book review: Microcomputer Tools for Communications Engineering
Dimensioning technique for meteor-burst communication systems
Optimal channel assignment in a packet-switching network with a conflict-free multiple-access scheme
Analysis of a multilink system in the presence of noise, cochannel interference and some hardware imperfections
  • Author(s): G. Lukatela  and  I.M. Kostić
  • Source: IEE Proceedings F (Communications, Radar and Signal Processing), Volume 132, Issue 6, p. 511 –516
  • DOI:  10.1049/ip-f-1.1985.0097
  • Type: Article
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  • p. 511 –516 (6)
    The paper presents a further development of the theoretical analysis that has been devoted to the terrestrial or satellite system with Gaussian noise and one cochannel intereference per link. The specific aims of the paper are to simplify the performance analysis of the multilink system by introducing an estimate on the upper and lower bound of the symbol error rate, and to present in analytical form the impact of some imperfections (noise of preamplifier, internal interference of cochannel type, internal noise, jitter produced by the first and second local oscaillators) that exist in each repeater as well as in the receiver of an m -ary CPSK or DCPSK system. It is assumed that the repeater output amplifier is a bandpass hard-limiter type (the BPHL type), and that noise and interference act independently on each link of the system.
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Cellular mobile packet radio using multiple-channel CSMA
  • Author(s): N.D. Wilson  and  S.S. Rappaport
  • Source: IEE Proceedings F (Communications, Radar and Signal Processing), Volume 132, Issue 6, p. 517 –526
  • DOI:  10.1049/ip-f-1.1985.0098
  • Type: Article
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  • p. 517 –526 (10)
    One way to increase frequency spectrum utilisation in a mobile communication system is to divide the geographical region spatially into a number of cells, each of which contains a base station. Each base station is assigned a set of channels, and the users in the neighbourhood of a base station can transmit their messages to the base station. Several protocols governing the access to the base station channels are available. The paper considers multichannel CSMA schemes embedded in a spatially celluar communication environment. Several alternative ways of organising the system resources, layout and protocol are considered. The complexity of the system is progressively increased, culminating in the general case: each base station is assigned a set of Cachannels and users access any one of the k nearest base stations with multichannel CSMA protocol. The performance characteristics of the system—normalised delay against system bandwidth utilisation—are given in terms of the system parameters. The several configurations considered are compared based on the delay, band-width utilisation and interference rejection characteristics.
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IEE Colloqium report: IEE Colloquium on Digital Audio Signals in Studio Centres

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