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Proceedings of the 1992 South African Symposium on Communications and Signal Processing最新文献

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Meteor-burst communications: the state of the science 流星爆炸通信:科学的现状
Proceedings of the 1992 South African Symposium on Communications and Signal Processing Pub Date : 1992-09-11 DOI: 10.1109/COMSIG.1992.274279
S. Melville, D. Fraser
{"title":"Meteor-burst communications: the state of the science","authors":"S. Melville, D. Fraser","doi":"10.1109/COMSIG.1992.274279","DOIUrl":"https://doi.org/10.1109/COMSIG.1992.274279","url":null,"abstract":"MBC systems have included point-to-point links, and both fixed station and dynamic vehicular networks. Available systems range from low data rate telemetry, through medium data rate message handling to high-speed conversational voice developments. This paper outlines previous work in the field and describes current systems and technology under development. Future research and development avenues are indicated with particular reference to local contributions.<<ETX>>","PeriodicalId":342857,"journal":{"name":"Proceedings of the 1992 South African Symposium on Communications and Signal Processing","volume":"32 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1992-09-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129870446","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
The synthesis of a new DC-free code with asymmetrical runlength constraints developed with the ACH-algorithm 利用ach算法开发了一种新的具有非对称行长约束的无dc代码
Proceedings of the 1992 South African Symposium on Communications and Signal Processing Pub Date : 1992-09-11 DOI: 10.1109/COMSIG.1992.274309
C. Menyennett, H. Ferreira
{"title":"The synthesis of a new DC-free code with asymmetrical runlength constraints developed with the ACH-algorithm","authors":"C. Menyennett, H. Ferreira","doi":"10.1109/COMSIG.1992.274309","DOIUrl":"https://doi.org/10.1109/COMSIG.1992.274309","url":null,"abstract":"Write-once recording of optical discs is an example of a channel requiring such constraints. The code was developed with the well-known Adler-Coppersmith-Hassner algorithm. Its detailed synthesis is presented, together with its error behaviour and power spectral density.<<ETX>>","PeriodicalId":342857,"journal":{"name":"Proceedings of the 1992 South African Symposium on Communications and Signal Processing","volume":"103 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1992-09-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133810802","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
The use of secret-key techniques in forward information verification 秘密密钥技术在前向信息验证中的应用
Proceedings of the 1992 South African Symposium on Communications and Signal Processing Pub Date : 1992-09-11 DOI: 10.1109/COMSIG.1992.274292
G. Kuhn
{"title":"The use of secret-key techniques in forward information verification","authors":"G. Kuhn","doi":"10.1109/COMSIG.1992.274292","DOIUrl":"https://doi.org/10.1109/COMSIG.1992.274292","url":null,"abstract":"The theory of secret-key authentication techniques for verification of information is discussed, using authentication in pre-paid energy systems as an example. Since in a pre-paid system there is no reverse channel to the transmitter, the data must be checked by an appended authenticity code. Several types of cryptographic attacks are possible in general authentication systems. In the pre-paid energy system the user has additionally the means to carry out a chosen-plaintext attack. The theoretical basis for the design of the authentication code is investigated.<<ETX>>","PeriodicalId":342857,"journal":{"name":"Proceedings of the 1992 South African Symposium on Communications and Signal Processing","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1992-09-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122174498","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 2
Maximum entropy conductivity estimation from airborne electromagnetic step-response data 从机载电磁阶跃响应数据估计最大熵电导率
Proceedings of the 1992 South African Symposium on Communications and Signal Processing Pub Date : 1992-09-11 DOI: 10.1109/COMSIG.1992.274295
N. Pendock
{"title":"Maximum entropy conductivity estimation from airborne electromagnetic step-response data","authors":"N. Pendock","doi":"10.1109/COMSIG.1992.274295","DOIUrl":"https://doi.org/10.1109/COMSIG.1992.274295","url":null,"abstract":"The airborne electromagnetic method is a geophysical remote sensing technique for mapping the electrical conductivity of the earth. Many possible conductivity distributions may be constructed to explain the data. From these distributions, the one with maximum entropy is chosen since it has minimum structure not accounted for by the data and may thus be regarded as the most honest possible.<<ETX>>","PeriodicalId":342857,"journal":{"name":"Proceedings of the 1992 South African Symposium on Communications and Signal Processing","volume":"25 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1992-09-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127686395","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
A fast box counting algorithm for determining the fractal dimension of sampled continuous functions 一种确定采样连续函数分形维数的快速盒计数算法
Proceedings of the 1992 South African Symposium on Communications and Signal Processing Pub Date : 1992-09-11 DOI: 10.1109/COMSIG.1992.274315
Henri Boshoff
{"title":"A fast box counting algorithm for determining the fractal dimension of sampled continuous functions","authors":"Henri Boshoff","doi":"10.1109/COMSIG.1992.274315","DOIUrl":"https://doi.org/10.1109/COMSIG.1992.274315","url":null,"abstract":"An adaptation of the box counting algorithm to samples of a continuous signal is given. An iterative scheme is combined with an exploitation of continuity to yield a fast method. This reduces the algorithm's complexity from quadratic to linear. The method is applied to speech segments; in this context it is faster than morphological filtering and Hurst analysis, and has comparable performance. The new algorithm is also suitable to be parallelized. It is applied to calculation of the dimension of fricative phonemes and automatic segmentation of speech into periodic/noiselike segments. This dimension value may be used instead of zero crossing rate in some applications.<<ETX>>","PeriodicalId":342857,"journal":{"name":"Proceedings of the 1992 South African Symposium on Communications and Signal Processing","volume":"124 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1992-09-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134551811","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 10
Subpixel accuracy in motion estimation for video coding 视频编码运动估计的亚像素精度
Proceedings of the 1992 South African Symposium on Communications and Signal Processing Pub Date : 1992-09-11 DOI: 10.1109/COMSIG.1992.274303
F. Bellifemine, M. Celidonio, A. Chimienti, G. Marcone, R. Picco
{"title":"Subpixel accuracy in motion estimation for video coding","authors":"F. Bellifemine, M. Celidonio, A. Chimienti, G. Marcone, R. Picco","doi":"10.1109/COMSIG.1992.274303","DOIUrl":"https://doi.org/10.1109/COMSIG.1992.274303","url":null,"abstract":"The aim is analysis of estimation accuracy for use in hybrid DCT coding schemes. The traditional block-matching algorithm has been generalized in order to take into account displacements of subpixel accuracy: 1, 1/2 and 1/4 pixel accuracies and different interpolation functions have been tested. The prediction error energy has been used to evaluate the performance of the estimation process. The problem has also been approached from the rate distortion theory point of view and the total performance tested considering also the increase in overheads for transmission of the motion vectors. An attempt to overcome the computational complexity of subpixel accuracies has been made. Results have been obtained by simulating a hybrid coder for constant quality coding.<<ETX>>","PeriodicalId":342857,"journal":{"name":"Proceedings of the 1992 South African Symposium on Communications and Signal Processing","volume":"22 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1992-09-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116947054","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 2
Some unique properties and applications of perfect squares minimum phase CAZAC sequences 完全平方最小相位CAZAC序列的一些独特性质及应用
Proceedings of the 1992 South African Symposium on Communications and Signal Processing Pub Date : 1992-09-11 DOI: 10.1109/COMSIG.1992.274294
U.H. Rohrs, L. Linde
{"title":"Some unique properties and applications of perfect squares minimum phase CAZAC sequences","authors":"U.H. Rohrs, L. Linde","doi":"10.1109/COMSIG.1992.274294","DOIUrl":"https://doi.org/10.1109/COMSIG.1992.274294","url":null,"abstract":"Properties described include the Constant Amplitude (CA) and Zero AutoCorrelation (ZAC) features, the ideal unfiltered and filtered Fourier transforms, the complex time domain, phase trajectory and perfect (unfiltered as well as filtered) periodic autocorrelation function properties. Additional characteristics presented are the remarkable resemblance between the CAZAC sequences and CWFM chirp signals, as well as the relationship between their instantaneous frequency and Fourier transform representations. Examples of the generation of typical PS-MP CAZAC sequences are given. It is demonstrated that these sequences are periodically, self-invertible and therefore constitute the optimum sequences for maximum-likelihood channel estimation. The paper includes simulation results with reference to potential applications.<<ETX>>","PeriodicalId":342857,"journal":{"name":"Proceedings of the 1992 South African Symposium on Communications and Signal Processing","volume":"132 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1992-09-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115402737","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 42
A parallel algorithm for high-speed data compression 高速数据压缩的并行算法
Proceedings of the 1992 South African Symposium on Communications and Signal Processing Pub Date : 1992-09-11 DOI: 10.1109/COMSIG.1992.274290
W. Penzhorn
{"title":"A parallel algorithm for high-speed data compression","authors":"W. Penzhorn","doi":"10.1109/COMSIG.1992.274290","DOIUrl":"https://doi.org/10.1109/COMSIG.1992.274290","url":null,"abstract":"The Lempel-Ziv algorithm is a very efficient universal data compression technique, based upon an incremental parsing technique which maintains codebooks of parsed phrases at the transmitter and at the receiver. In an attempt to increase speed the algorithm has been parallelised to run on two processors. This requires the maintaining of two independent sets of codebooks. The algorithm was applied to the compression of various text files, and graphs illustrating these results are included.<<ETX>>","PeriodicalId":342857,"journal":{"name":"Proceedings of the 1992 South African Symposium on Communications and Signal Processing","volume":"77 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1992-09-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123250439","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 3
New bounds on the cardinality of double synchronization-error-correcting codes 双同步纠错码基数的新界限
Proceedings of the 1992 South African Symposium on Communications and Signal Processing Pub Date : 1992-09-11 DOI: 10.1109/COMSIG.1992.274293
A. Helberg, H. Ferreira
{"title":"New bounds on the cardinality of double synchronization-error-correcting codes","authors":"A. Helberg, H. Ferreira","doi":"10.1109/COMSIG.1992.274293","DOIUrl":"https://doi.org/10.1109/COMSIG.1992.274293","url":null,"abstract":"This paper presents improved upper and lower bounds on the cardinality of binary codes capable of correcting one or two random synchronization errors per codeword. These bounds were derived by determining and considering the Hamming distance properties of the double synchronization-error-correcting codes. These new bounds are compared with known bounds for such codes.<<ETX>>","PeriodicalId":342857,"journal":{"name":"Proceedings of the 1992 South African Symposium on Communications and Signal Processing","volume":"17 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1992-09-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125450685","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Early fast Doppler as a meteor-burst communications amplitude predictor 早期快速多普勒作为流星爆发通信幅度预测器
Proceedings of the 1992 South African Symposium on Communications and Signal Processing Pub Date : 1992-09-11 DOI: 10.1109/COMSIG.1992.274284
D. Fraser, A. Broadhurst
{"title":"Early fast Doppler as a meteor-burst communications amplitude predictor","authors":"D. Fraser, A. Broadhurst","doi":"10.1109/COMSIG.1992.274284","DOIUrl":"https://doi.org/10.1109/COMSIG.1992.274284","url":null,"abstract":"EFD theory, predictions and measurements are presented. Statistical analysis of the results show correlations between EFD and trial characteristics which make forward predictions possible in an open-loop system. Estimates of improved data throughput are given. A method of implementation is given which uses an artificial neural network for trial classification and prediction.<<ETX>>","PeriodicalId":342857,"journal":{"name":"Proceedings of the 1992 South African Symposium on Communications and Signal Processing","volume":"102 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1992-09-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121381806","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 2
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