# Communications, Radar and Signal Processing, IEE Proceedings F

## Filter Results

Displaying Results 1 - 20 of 20
• ### Editorial

Publication Year: 1986
| |PDF (148 KB)
• ### Silicon GlenÂ¿Â¿myth or reality?

Publication Year: 1986
| |PDF (2034 KB)

Over the past century, Scotland has contributed greatly to the electrical engineering profession, numbering among its sons the likes of Lord Kelvin, James Clerk Maxwell, Alexander Graham Bell, John Logie Baird and Alan Campbell Swinton. Remarkably, it was the need for female assembly labour in the last War that led Ferranti plc to manufacture its gyroscopic gunsights in Edinburgh and give birth to... View full abstract»

• ### Multiplier-free filters for ground clutter suppression

Publication Year: 1986, Page(s):12 - 15
| |PDF (436 KB)

The transmission characteristics of the usual two- and three-pulse feedforward cancellers have certain properties such as narrow clutter notch and uneven transmission region which may be undersirable in many applications. Recursive filters need multipliers and may be too expensive if large quantities of filters are required. The paper presents a class of multiper-free digital recurisive filters fo... View full abstract»

• ### Some useful criteria for the optimisation of phase code spectra

Publication Year: 1986, Page(s):16 - 20
| |PDF (464 KB)

Through mainly numerical studies, some criteria of performance have evolved which offer a means of alternative comparisons of spectral efficiency other than or in support of the more traditional forms. Modulation schemes considered in the paper are single-h continuous phase FSK and multimode (h) partial-response FSK (MHPR). Suggested performance codes are given governing the efficiency of the stip... View full abstract»

• ### Intersymbol interference and timing jitter performance of realisable data transmission filters

Publication Year: 1986, Page(s):21 - 24
| |PDF (391 KB)

An analytic solution to the intersymbol interference and timing jitter suppression problems for optimal realisable data transmission filters is presented. By analysing the performance of several practical filters, a design graph and a mathematical expression giving the relationship between bandwidth, degree of filter and percentage eye closure are given. View full abstract»

• ### Closed-loop autocorrelator and its application to frequency discrimination

Publication Year: 1986, Page(s):25 - 33
| |PDF (1005 KB)

A new closed-loop autocorrelation system is proposed in the paper. It is based on a conventional autocorrelator; however, the fixed delay is replaced by a variable delay line and the autocorrelator output is fed back to control the delay. The variable delay can be realised by a SAW voltage-controlled variable delay line (VCDL). Adetailed analysis of the loop is given. It is shown that for some spe... View full abstract»

Publication Year: 1986
| |PDF (84 KB)
• ### Reduced search soft-decision minimum-distance decoding for binary block codes

Publication Year: 1986, Page(s):34 - 38
| |PDF (649 KB)

A reduced search soft-decision decoding algorithm for binary block codes is presented. It is based on the weight distribution of the code and the transition probabilities of a binary input Q-ary output channel in sequencing the codeword classes during a table look-up operation. An upper bound is presented for the decoding time improvement factor of the reduced search algorithm compared to exhausti... View full abstract»

• ### Coherent radar detection in log-normal clutter

Publication Year: 1986, Page(s):39 - 53
Cited by:  Papers (16)
| |PDF (2061 KB)

The paper deals with the problem of radar detection of a target echo embedded in log-normal clutter and white Gaussian noise. Relevant features of this article, with respect to previous papers on the same subject, refer to the coherent model assumed for the clutter and the processing chain. In more detail, the in-phase and quadrature components of clutter have been modelled to give a log-normal am... View full abstract»

• ### Distributed radar detection theory

Publication Year: 1986, Page(s):55 - 60
Cited by:  Papers (60)
| |PDF (660 KB)

A theory of the distributed detection of radar targets is developed. The radar system employs a number of physically separated peripheral receivers and detectors and a central processor that provides a final decision by combining peripheral decisions rather than decision statistics. Various combining strategies are studied in the context of overall system optimality. It is shown that the optimal d... View full abstract»

• ### Doubly co-operative ternary sequences

Publication Year: 1986, Page(s):61 - 67
| |PDF (900 KB)

Design procedures for constructing complementary binary sequences and co-operative binary sequences are available in the literature. In the paper an algorithm for constructing pairs of ternary sequences which are co-operative not only in the autocorrelation domain but also in the signal domain (and hence called doubly¿¿ co-operative) is presented. The two signals can be transmitted as if they are... View full abstract»

• ### Low-bit-rate encoder for picture signals using a centre-clipping quantiser

Publication Year: 1986, Page(s):68 - 72
Cited by:  Papers (1)
| |PDF (742 KB)

For improved performance of a predictive coding system used for encoding picture signals at low bit rates, it is necessary to design not only an efficient predictor, but also an efficient quantiser that produces minimum perceptible distortion. We have described in the paper a scheme in which a special quantiser called a centre-clipping quantiserÂ¿ (CCQ) is used in a ratio PCM coder. The subjectiv... View full abstract»

• ### Performance of a trunk frame organisation for circuit/packet switching network

Publication Year: 1986, Page(s):73 - 80
| |PDF (953 KB)

The paper examines the performance of a trunk frame organisation which combines circuit and packet switching capabilities. Circuit performance for the proposed organisation is analysed in terms of blocking probability and uses an exhaustive state enumeration technique. Packet performance is analysed in terms of mean delay, using a work¿¿ concept. Finally, the behaviour of the optimal circuit/pack... View full abstract»

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

Publication Year: 1986, Page(s):81 - 86
Cited by:  Papers (1)
| |PDF (774 KB)

The paper deals with the problem of improving the performance of the adaptive transform coder which operates on noisy speech. We propose to estimate the short-time spectral amplitude (STSA) of the original speech and to utilise the noisy phase prior to the encoding process. The appropriate minimum mean-square error STSA estimator is derived and the system is examined in encoding speech which has b... View full abstract»

• ### Semicoherent Doppler processing technique

Publication Year: 1986, Page(s):87 - 94
| |PDF (940 KB)

A coherent radar digital data collector (CRDDC) has been developed which records I, Q data obtained by sampling the receiver intermediate frequency (IF) of a fan-beam radar with a single A/D convertor. The paper describes the sampling technique which was developed for this application, called the semicoherent Doppler processing technique, which allows operation with radars employing a noncoherent ... View full abstract»

• ### Power spectral density of digital continuous phase modulation with correlated data symbols. Part 1: Autocorrelation function method

Publication Year: 1986
Cited by:  Papers (2)
| |PDF (1239 KB)

A general method for computing the power spectral density (PSD) of an encoded, continuous phase modulated (CPM) signal with correlated data symbols is presented in the paper. The encoder is a finite-state sequential machine which introduces correlation between symbols transmitted in different time slots. The method used is the so-called autocorrelation function method, in which the autocorrelation... View full abstract»

• ### Power spectral density of digital continuous phase modulation with correlated data symbols. Part 2: Rowe-Prabhu method

Publication Year: 1986, Page(s):106 - 114
Cited by:  Papers (2)
| |PDF (987 KB)

An extension of the Rowe-Prabhu method is presented for finding the power spectral density (PSD) of continuous phase modulated (CPM) signals with correlated data symbols. Correlation between symbols in different time slots is introduced by an encoder which is represented as a finite-state sequential machine. This structure simplifies any procedure for the spectral analysis of modulated signals wit... View full abstract»

• ### Significance of phase distortion in digital transmission systems

Publication Year: 1986, Page(s):115 - 127
Cited by:  Papers (1)
| |PDF (1541 KB)

The paper presents a study of the significance of phase distortion in digital transmission systems. Beginning with a review of the eye diagram and contour map criteria, we compare their advantages and disadvantages with those of the mean-square error and probability of error criteria. Using the eye diagram and contour map criteria, we then employ cosine rolloff, Cheb\$yshev and Butterworth function... View full abstract»

• ### Applications of Walsh and Related Functions with an Introduction to Sequency Theory

Publication Year: 1986, Page(s):127 - 128
| |PDF (339 KB)