摘要:

A simple, parallel-mode tactile transducer for extracting three-dimensional digital representations of complex engineering components is proposed. In addition, algorithms for computer processing of the tactile information to produce a compact structural description of the scrutinized object are evolved. The possibility exists that these techniques might be applied to future generations of automatic assembly machines with sensory feedback.

DOI:10.1049/ree.1976.0078

出版商:IERE    

年代:1976

数据来源: IET

摘要:

The switcheda posterioriprobability (s.a.p.) diversity combiner has equivalent performance to maximuma posterioriprobability (m.a.p.) combiner for dual diversity when binary transmission is used. Moreover, it is much simpler to implement since it is similar in principle to the conventional switched diversity combiner. The difference is that instead of switching to the branch with the highest signal-to-noise ratio, the switching is done between the branches on a bit-by-bit basis and to the branch which is most likely to be correct about what was sent. Some examples of impulse noise are used to show the difference between the m.a.p. (or s.a.p.) methods and the conventional methods of maximal ratio combining, selector branch combining, and no diversity, in terms of average error probability.The examples also illustrate the different processing that is done on the signals by the different methods. One possible method of implementing the s.a.p. technique is proposed for the case of 4-phase p.s.k. with differential encoding.

DOI:10.1049/ree.1976.0079

出版商:IERE    

年代:1976

数据来源: IET

摘要:

The paper describes various iterative detection processes that are suitable for use in a synchronous serial data-transmission system, operating at a transmission rate of up to 10 000 bits per second over a slowly time varying channel. The methods of operation of the different detection processes are first described, and then the results of computer simulation tests are presented, comparing the tolerances of the detection processes to additive white Gaussian noise with the tolerances of conventional linear and non-linear equalizers. Several different time invariant channels are used in the tests. It is shown that a relatively simple detection process can achieve a considerable improvement in tolerance to soise over both linear and non-linear equalizers of optimum design.

DOI:10.1049/ree.1976.0080

出版商:IERE    

年代:1976

数据来源: IET

摘要:

The error performance of filter threshold and integrate and dump demodulators is calculated, for phase shift key (p.s.k.) and fast frequency shift key (f.f.s.k) modulated data signals. A review is given of existing theory and techniques and some material is presented on f.f.s.k. demodulators.

DOI:10.1049/ree.1976.0081

出版商:IERE    

年代:1976

数据来源: IET

摘要:

The bounds for the probability of error for f.s.k. systems using optimum detection are stated. The upper bound is obtained for other cases of interest using non-optimum detection. The theoretical results are presented together with past practical results and some new practical results for a wide-band digital f.m. system.

DOI:10.1049/ree.1976.0082

出版商:IERE    

年代:1976

数据来源: IET

摘要:

An approximate, but simple and accurate method is presented for determining current distribution along and admittance of thin symmetrical cylindrical antennas situated at the interface between two homogeneous media and driven by a coaxial line.

DOI:10.1049/ree.1976.0083

出版商:IERE    

年代:1976

数据来源: IET

摘要:

Spherical scanning is a very convenient means of mapping a microwave aperture for a localized remote imaging system. Provided that the scan angle does not exceed the derived limits for tolerable spherical aberration, a Fourier microwave hologram, recorded on a spherical surface, yields clearly identifiable, computer-reconstructed images.

DOI:10.1049/ree.1976.0084

出版商:IERE    

年代:1976

数据来源: IET