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# Communications, Radar and Signal Processing, IEE Proceedings F

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Displaying Results 1 - 16 of 16
• ### Future trends in telecommunications transmissionÂ¿a personal view

Publication Year: 1984, Page(s):669 - 683
Cited by:  Papers (2)
| | PDF (1949 KB)

After briefly tracing transmission system development to the present day, the paper goes on to consider the likely progression of both services and technology in the near and far future. To provide a clear focus for the discussion, a number of end pointÂ¿ developments and targets are postulated as the ultimate objectives of the transmission engineer. The latest technology developments are then ci... View full abstract»

• ### Cryptographic techniques and network security

Publication Year: 1984, Page(s):684 - 694
| | PDF (1704 KB)

In the paper some of the cryptographic techniques, algorithms and applications in computer networks are reviewed. Symmetric and asymmetric cryptosystems, possible cryptanalytical attacks, cryptosecurity and the relevance of complexity theory to the security of ciphers are described. The major threats and counter-measures in computer-network communications are outlined. Finally, cryptographic appli... View full abstract»

• ### Erratum: M-ary continuous phase frequency shift keying with modulation index 1/M

Publication Year: 1984
| PDF (73 KB)
• ### Investigation of a radar site effect

Publication Year: 1984, Page(s):695 - 708
| | PDF (1355 KB)

An experimental investigation is described of the scattering effect responsible for large errors in the azimuth bearing measurements obtained with a 1 GHz monopulse receiver on a particular site when the signal source occupied positions near the top of a distant hill. The received field distribution on a horizontal line directly in front of the monopulse aperture was sampled by means of a travelli... View full abstract»

• ### DC coefficient restoration in transform image coding

Publication Year: 1984, Page(s):709 - 713
Cited by:  Papers (9)
| | PDF (561 KB)

In a transform coding system, a large number of bits have to be allocated to high-energy DC coefficients for both fine quantisation and good channel error immunity. Three schemes are proposed, in which the DC coefficients are not transmitted, but estimated at the receiver. This allows a reduction in bit rate, as well as the possibility of eliminating the serious effect of channel errors on those c... View full abstract»

• ### Relationship between the maximum entropy method and a likelihood ratio test

Publication Year: 1984, Page(s):714 - 718
| | PDF (582 KB)

It is demonstrated that the maximum entropy method is closely related to a general likelihood ratio detector which tests for the equality of two covariance matrices. These results may be used to indicate which (if any) maximum entropy spectral estimate contains significant information. View full abstract»

• ### A survey of one-coincidence sequences for frequency-hopped spread-spectrum systems

Publication Year: 1984, Page(s):719 - 724
Cited by:  Papers (24)
| | PDF (767 KB)

Sequences are often used as a basis for code division multiplexing. In order that minimum interference from other users should occur, it is important that the sequences used should have good cross-correlation properties. Various sets of sequences have been derived with appropriate properties, but the sources have been well dispersed within the literature. In the paper are collected six of the most... View full abstract»

• ### Number of one-coincidence sequence sets for frequency-hopping multiple access communication systems

Publication Year: 1984, Page(s):725 - 728
Cited by:  Papers (1)
| | PDF (516 KB)

The paper presents a new and general description of a class of one-coincidence sequence sets. The set leaders of this class are derived from the combination of N linearly independent phases of a binary m-sequence of length S= 2N¿¿1. This class will be referred to in this paper as the m-sequence class of one-coincidence sequences. The total number of one-coincidence sets of this class is derived. I... View full abstract»

• ### Transient probability response of cycle slip occurence in the PSK-TDMA carrier recovery

Publication Year: 1984, Page(s):729 - 733
| | PDF (502 KB)

The class of carrier recovery which is often employed in PSK-TDMA systems is frequency multiplier/narrow-band filter/frequency divider¿¿. Cycle slips occur when a signal extracted from the narrow-band filter is embedded in some noise. In the PSK-TDMA systems, a transmitted signal S is of the burst form while received noise N is in the steady state. A preceding burst signal I is often allocated im... View full abstract»

• ### Application of surface-acoustic-wave technology to burst-format spread-spectrum communications

Publication Year: 1984, Page(s):734 - 741
Cited by:  Papers (3)
| | PDF (928 KB)

A hybrid direct-sequence/frequency-hopping spread-spectrum communication modem for burst format transmission of digital data has been developed. A burst consists of a short synchronisation preamble and the data packet. Data modulation is accomplished by assignment of pairs of pseudonoise sequences with low crosscorrelation for message ones and zeros. The spreading code chip pattern is changed from... View full abstract»

• ### Limits on the search rate of a pseudonoise sliding correlator synchroniser due to self-noise and decorrelation

Publication Year: 1984, Page(s):742 - 750
| | PDF (1099 KB)

Sliding correlators are frequently used in the acquisition of pseudonoise sequences in spread-spectrum and ranging systems. High-speed acquisition is often required. The paper examines the decorrelation between the received and locally generated codes and the increase in self-generated noise at the output of the correlator as the search rate is increased. A numerical approach enables the analysis ... View full abstract»

• ### IEE conference publication 231

Publication Year: 1984
| PDF (86 KB)
• ### Distributed routing algorithm for a circuit packet switching network

Publication Year: 1984, Page(s):751 - 760
| | PDF (1125 KB)

A distributed routing algorithm for an integrated network with circuit and packet switching capabilities is proposed. The algorithm is based on the ideas of a minimum-delay routing algorithm proposed by Gallager. The trunk organisation used in the integrated network allows a fixed or moving boundary between circuit and packet traffic. The proposed routing algorithm operates independently of the tr... View full abstract»

• ### Electronic hardware implementation of the principal components transformation for multichannel image data

Publication Year: 1984, Page(s):761 - 767
| | PDF (1173 KB)

An implementation of the principal components transformation is presented which makes use of analogue and digital electronic hardware under the control of a microprocessor. The hardware is used to collect covariance statistics from a multichannel set of digital video images and to perform the actual transformation on real-time analogue video signals derived from the stored data. This approach offe... View full abstract»