Pub Date : 1964-06-01DOI: 10.1109/TCOM.1964.1088911
L. Saporta
The author describes how to derive the average cross-correlation as ⩾ [-1/(n-1)] (average signal energy), where the averaging is over the ensemble of signals. In the important special case in which all signals have the same energy E and all the cross-correlations are made equal to R, this result reduces to the constraint R ⩾ -[E/(n-1)].
{"title":"A lower bound on the cross correlation between signals of prescribed energy","authors":"L. Saporta","doi":"10.1109/TCOM.1964.1088911","DOIUrl":"https://doi.org/10.1109/TCOM.1964.1088911","url":null,"abstract":"The author describes how to derive the average cross-correlation as ⩾ [-1/(n-1)] (average signal energy), where the averaging is over the ensemble of signals. In the important special case in which all signals have the same energy E and all the cross-correlations are made equal to R, this result reduces to the constraint R ⩾ -[E/(n-1)].","PeriodicalId":179779,"journal":{"name":"IEEE Transactions on Communications Systems","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1964-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123889516","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}
Pub Date : 1964-03-01DOI: 10.1109/TCOM.1964.1088893
M. Mitchell
This communication extends some earlier results [ibid., vol CS-10, pp. 425-435, December, 1962], on the performance of inhibited error-correction decoders. This extension was made necessary by the fact that an important new type of an inhibited error-control decoder has recently become available. The characteristic feature of these new error-control decoders is the correction of a class of errors which can be adjusted (in real time if desired) to include alternative specified patterns of either random, burst, or both random and burst errors together with detection of a corresponding class of uncorrectable errors, such that either the correction operation or the decoder output can be inhibited when doubtful. Because of this special characteristic, these decoders are called "detecting random-burst" (DRB) decoder
该通信扩展了一些早期的结果[同上，vol CS-10, pp. 425-435, December, 1962]，关于抑制错误校正解码器的性能。这种扩展是必要的，因为一种重要的新型抑制错误控制解码器最近变得可用。这些新的错误控制解码器的特征特征是纠正一类错误，这些错误可以被调整(如果需要的话是实时的)，以包括随机、突发或随机和突发错误的可选指定模式，以及检测相应类别的不可纠正错误，这样，当怀疑时，纠正操作或解码器输出都可以被抑制。由于这种特殊的特性，这些解码器被称为“检测随机突发”(DRB)解码器
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Pub Date : 1964-03-01DOI: 10.1109/TCOM.1964.1088885
F. Haber
In this communication, a family of sampling formulas are developed which have better convergence properties than the standard formula based on amplitude samples taken at the Nyquist rate. Sampling is done at higher than the minimum rate and a sampling function, whose Fourier transform has cosine tapered skirts, is used. Suitable choice of the taper results in a formula with no "crosstalk" at the sampling instants. Interpolation between samples generally requires fewer samples than required by the standard formula. Tables and curves for several cases are provided.
{"title":"Rapidly converging sample weighting functions","authors":"F. Haber","doi":"10.1109/TCOM.1964.1088885","DOIUrl":"https://doi.org/10.1109/TCOM.1964.1088885","url":null,"abstract":"In this communication, a family of sampling formulas are developed which have better convergence properties than the standard formula based on amplitude samples taken at the Nyquist rate. Sampling is done at higher than the minimum rate and a sampling function, whose Fourier transform has cosine tapered skirts, is used. Suitable choice of the taper results in a formula with no \"crosstalk\" at the sampling instants. Interpolation between samples generally requires fewer samples than required by the standard formula. Tables and curves for several cases are provided.","PeriodicalId":179779,"journal":{"name":"IEEE Transactions on Communications Systems","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1964-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114012194","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}
Pub Date : 1964-03-01DOI: 10.1109/TCOM.1964.1088895
J. Mensch, C. Pearson
A multichannel airborne communications system which provides 15 voice frequency channels on a single RF carrier between airborne terminals via radio relay aircraft has been developed, produced and is now operating. In this system, UHF radios, frequency division multiplexer sets, and cordless switchboards are used to obtain transcontinental, telephone-type communications.
{"title":"An Airborne UHF Voice Multiplex Communications System","authors":"J. Mensch, C. Pearson","doi":"10.1109/TCOM.1964.1088895","DOIUrl":"https://doi.org/10.1109/TCOM.1964.1088895","url":null,"abstract":"A multichannel airborne communications system which provides 15 voice frequency channels on a single RF carrier between airborne terminals via radio relay aircraft has been developed, produced and is now operating. In this system, UHF radios, frequency division multiplexer sets, and cordless switchboards are used to obtain transcontinental, telephone-type communications.","PeriodicalId":179779,"journal":{"name":"IEEE Transactions on Communications Systems","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1964-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125971203","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}
Pub Date : 1963-12-01DOI: 10.1109/TCOM.1963.1088789
J. Halina
The engineering of telecommunications networks proceeds from an estimate of potentially offered loads in the descriptive form of input-output tables, through a functional design stage, to the redevelopment of inadequate existing facilities or, occasionally, the implementation of entirely new ones. Networks are, by definition, highly structured entities. Thus, the intermediate stage in the engineering process is one of analysis of demand statements for embedded but not directly evident structure. This paper introduces a gross measure of organization or structure, then describes an arithmetic procedure for the detection of structural pattern in interaction systems. It concludes with illustrative examples and a program for further research. While the problem examined here is framed in the telecommunications environment, the argument is not particular to communications and may, therefore, bear on social, transportation and like interaction systems. Since organizations are control systems characterized by their information flows, these can be studied as information networks.
{"title":"The Structure of Interactions - an Exploratory Study of the Organization of Networks","authors":"J. Halina","doi":"10.1109/TCOM.1963.1088789","DOIUrl":"https://doi.org/10.1109/TCOM.1963.1088789","url":null,"abstract":"The engineering of telecommunications networks proceeds from an estimate of potentially offered loads in the descriptive form of input-output tables, through a functional design stage, to the redevelopment of inadequate existing facilities or, occasionally, the implementation of entirely new ones. Networks are, by definition, highly structured entities. Thus, the intermediate stage in the engineering process is one of analysis of demand statements for embedded but not directly evident structure. This paper introduces a gross measure of organization or structure, then describes an arithmetic procedure for the detection of structural pattern in interaction systems. It concludes with illustrative examples and a program for further research. While the problem examined here is framed in the telecommunications environment, the argument is not particular to communications and may, therefore, bear on social, transportation and like interaction systems. Since organizations are control systems characterized by their information flows, these can be studied as information networks.","PeriodicalId":179779,"journal":{"name":"IEEE Transactions on Communications Systems","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1963-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125187884","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}
Pub Date : 1963-12-01DOI: 10.1109/TCOM.1963.1088772
H. Kaneko
a very special case of the synchronization problem is considered. The information-bearing signal is a rectangular waveform and is tmnsmitted through a channel perturbed by a stationary white Gaussian noise. A sinusoidal synchronizing signal is assumed to be transmitted separately from the informationbearing signal and is also perturbed by an independent noise. The Bayes receiver is considered for the detection of the informationbearing signal, s and a synchronizer with a narrow-band filter and an ideal phase detector is assumed.
{"title":"A statistical analysis of the synchronization of a binary receiver","authors":"H. Kaneko","doi":"10.1109/TCOM.1963.1088772","DOIUrl":"https://doi.org/10.1109/TCOM.1963.1088772","url":null,"abstract":"a very special case of the synchronization problem is considered. The information-bearing signal is a rectangular waveform and is tmnsmitted through a channel perturbed by a stationary white Gaussian noise. A sinusoidal synchronizing signal is assumed to be transmitted separately from the informationbearing signal and is also perturbed by an independent noise. The Bayes receiver is considered for the detection of the informationbearing signal, s and a synchronizer with a narrow-band filter and an ideal phase detector is assumed.","PeriodicalId":179779,"journal":{"name":"IEEE Transactions on Communications Systems","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1963-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125720411","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}
Pub Date : 1963-06-01DOI: 10.1109/TCOM.1963.1088754
D. Rhodes
{"title":"Group synchronization as an information determining process","authors":"D. Rhodes","doi":"10.1109/TCOM.1963.1088754","DOIUrl":"https://doi.org/10.1109/TCOM.1963.1088754","url":null,"abstract":"","PeriodicalId":179779,"journal":{"name":"IEEE Transactions on Communications Systems","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1963-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129533312","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}
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