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# Communications, Radar and Signal Processing, IEE Proceedings F

## Filter Results

Displaying Results 1 - 16 of 16
• ### Comparison of strategies for serial acquisition of frequency-hopped spread-spectrum signals

Publication Year: 1986, Page(s):129 - 137
Cited by:  Papers (11)
| | PDF (835 KB)

The method of serial search for coarse acquisition of frequency-hopped spread-spectrum signals is investigated from a practical aspect. A convenient method for deriving acquisition time statistics is outlined. Search performance is optimised for minimum acquisition time by comparing search techniques and strategies, and by observing the effect of diverse environments. View full abstract»

• ### Erratum: Combined enhancement and adaptive transform coding of noisy speech

Publication Year: 1986
| PDF (80 KB)
• ### Directional response of a towed array in shallow sea

Publication Year: 1986, Page(s):138 - 145
| | PDF (878 KB)

In a recent paper, M.J. Buckingham carried out a theoretical treatment of the directional response of a towed line array in shallow sea. The analysis was based on the description of the sound field in terms of normal mode solution of the wave equation. An important limitation of this analysis is that it assumes the normal modes to propagate unattenuated in the channel. In the present paper realist... View full abstract»

• ### Erratum: Large area characterisation of urban UHF multipath propagation and its relevance to the performance bounds of mobile radio systems

Publication Year: 1986
| PDF (89 KB)
• ### Graph theory for image analysis: an approach based on the shortest spanning tree

Publication Year: 1986, Page(s):146 - 152
Cited by:  Papers (46)
| | PDF (1183 KB)

The paper describes methods of image segmentation and edge detection based on graph-theoretic representations of images. The image is mapped onto a weighted graph and a spanning tree of this graph is used to describe regions or edges in the image. Edge detection is shown to be a dual problem to segmentation. A number of methods are developed, each providing a different segmentation or edge detecti... View full abstract»

• ### Spectral analysis of randomly sampled signals using a correlation-based slotting technique

Publication Year: 1986, Page(s):153 - 162
Cited by:  Papers (2)
| | PDF (1134 KB)

A detailed investigation of correlation-based methods for generating spectral estimates from randomly sampled signals is described. Particular attention is paid to the effects of quantising the time instants, or lag time, associated with the data samples. Explicit formulas are given for the bias errors associated with various quantisation schemes, and a simple derivation of an asymptotic expressio... View full abstract»

• ### Waveform design and doppler sensitivity analysis for nonlinear FM chirp pulses

Publication Year: 1986, Page(s):163 - 175
Cited by:  Papers (1)
| | PDF (1251 KB)

The use of pulse compression to obtain simultaneous long-range detection and good range resolution is described. The types of modulation that can be used to obtain pulse compression are outlined with particular emphasis on their performance under Doppler shift. It is shown that nonlinear frequency-modulated (FM) signals are capable of providing low range-sidelobes while being compressed using a ma... View full abstract»

• ### Cell-averaging CFAR for multiple-target situations

Publication Year: 1986, Page(s):176 - 186
Cited by:  Papers (8)
| | PDF (1027 KB)

The performance of a mean-level detector is considered when one or more interfering target returns is present in the set of cells used in estimating the reference level. A serious degradation of detection probability is demonstrated for Swerling target fluctuation models 1 and 3. To alleviate the problem we analyse an alternative procedure. A censoring scheme is proposed whereby samples exceeding ... View full abstract»

• ### Factors affecting use and design of spread-spectrum modems for the HF band

Publication Year: 1986, Page(s):187 - 193
Cited by:  Papers (2)
| | PDF (1018 KB)

The design of a spread-spectrum modem for HF channels to combat multipath and interference effects is considered, and the performance results obtained with a prototype system are discussed. The features of the modem include automatic synchronisation, diversity operation, provision for an ARQ mode and M-ary block coding. View full abstract»

• ### Generalised crosscorrelator with data-estimated weighting function: a simulation analysis

Publication Year: 1986, Page(s):195 - 198
| | PDF (512 KB)

The distinctive feature of a generalised crosscorrelator (GCC) over a conventional one is the presence of a filtering section which enables it to enhance its performance according to some optimality criterion. This section provides a weighting action on the crosspower density spectrum of the input signals and, if properly designed, can improve the estimate of the time delay existing between wavefo... View full abstract»

• ### Performance evaluation of a 512-QAM system in distorted channels

Publication Year: 1986, Page(s):199 - 204
Cited by:  Papers (3)
| | PDF (715 KB)

The effects of linear channel distortions on the performance of a 512-QAM system are studied. Performance degradation due to linear, parabolic sinusoidal amplitude and group delay channel distortions are calculated by means of computer simulation. It is shown that sinusoidal amplitude and linear group delay distortions degrade most significantly the system performance. Comparison of the results wi... View full abstract»

• ### Use of toleranced costÂ¿ functions for circuit routing in complex communications networks

Publication Year: 1986, Page(s):205 - 209
| | PDF (755 KB)

A network routing algorithm is described which allows multiple routing options, from any one source to all destinations, to be defined with virtually the same computational load as the single cheapestÂ¿ route to all destinations. It also presents the result in a manner well suited to further editing by the human network designer or manager. The algorithm is founded on the nature of the relevant c... View full abstract»

• ### Book review: Doppler Radar and Weather Observations

Publication Year: 1986
| PDF (166 KB)
• ### Editorial for special issue of the IEE Proceedings on Historical radar

Publication Year: 1986
| PDF (193 KB)
• ### Conference report. Radar 85

Publication Year: 1986, Page(s):212 - 214
| PDF (500 KB)
• ### Erratum: Power spectral density of digital continuous phase modulation with correlated data symbols. Part 1: Autocorrelation function method, and Part 2: Rowe-Prabhu method

Publication Year: 1986
| PDF (193 KB)