IEEE Transactions on Communication Technology最新文献

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Communication at Low Date Rates - Spectral Analysis Receivers 低数据速率通信。频谱分析接收机
IEEE Transactions on Communication Technology Pub Date : 1968-10-01 DOI: 10.1109/TCOM.1968.1089906
M. Ferguson
{"title":"Communication at Low Date Rates - Spectral Analysis Receivers","authors":"M. Ferguson","doi":"10.1109/TCOM.1968.1089906","DOIUrl":"https://doi.org/10.1109/TCOM.1968.1089906","url":null,"abstract":"The purpose of this paper is to introduce a multiple frequency shift keying spectral analysis receiver based on the fast Fourier transform. A novel decision-directed automatic frequency control (AFC) for use with the fast Fourier receiver is mentioned. Not only is the system to be described better than a truncated autocorrelation receiver, the analysis required is unorthodox, being based on the fact that the spectral coefficients of the incoming waveform are chi-square (central or noncentral) distributed. The fast Fourier receiver, under typical conditions, is 1.5 dB better than the autocorrelation receiver, is more versatile (e.g., tone spacing to multiples of1/THz, spectral window shaping very easy), easier to implement, less subject to signal-to-noise ratio degradation due to frequency offset, and provides fine frequency information to operate a decision-directed AFC.","PeriodicalId":134522,"journal":{"name":"IEEE Transactions on Communication Technology","volume":"46 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1968-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129602162","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: 5
Communication at Low Data Rates - Oscillator Models and Corresponding Optimal Receivers 低数据速率下的通信——振荡器模型和相应的最佳接收器
IEEE Transactions on Communication Technology Pub Date : 1968-08-01 DOI: 10.1109/TCOM.1968.1089884
M. Ferguson
{"title":"Communication at Low Data Rates - Oscillator Models and Corresponding Optimal Receivers","authors":"M. Ferguson","doi":"10.1109/TCOM.1968.1089884","DOIUrl":"https://doi.org/10.1109/TCOM.1968.1089884","url":null,"abstract":"For virtually any model of an unstable oscillator, at low signal-to-noise ratios, the maximum-likelihood ratio receiver is asymptotically quadratic. A quadratic receiver roughly corresponds to a weighted spectral analysis of the received signal. Two major models of unstable oscillators which seem reasonable for low data rate communication using orthogonal signals are considered. The first assumes that the signal is a stationary narrow-band Gaussian process. The second assumes that the oscillator phase is a random process. Optimal receivers are obtained for the first model and several examples of the second. These receivers are all noted for their inordinate degree of nonlinearity and complexity.","PeriodicalId":134522,"journal":{"name":"IEEE Transactions on Communication Technology","volume":"11 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1968-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121323001","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
The Improvement of Digital HF Communication Through Coding: I - Interleaved Cyclic Coding 通过编码改进数字高频通信:I -交错循环编码
IEEE Transactions on Communication Technology Pub Date : 1968-05-01 DOI: 10.21236/ad0670184
K. Brayer
{"title":"The Improvement of Digital HF Communication Through Coding: I - Interleaved Cyclic Coding","authors":"K. Brayer","doi":"10.21236/ad0670184","DOIUrl":"https://doi.org/10.21236/ad0670184","url":null,"abstract":"In previous work the technique of error correction of digital data through the use of interleaved cyclic codes and a set of probability functions for the evaluation of error patterns have been presented. In this paper the previous results will be extended to the class of Bose-Chaudhuri-Hocquenghem (BCH) codes and PMcodes. A set of simple equations will be presented for the description of an interleaved cyclic code and for its associated delay. The performance of interleaved cyclic codes will be demonstrated to be sufficient to correct all types of measured HF error patterns, and, using delay as a basis of comparison, it will be demonstrated that only the total bit interleaving is important in achieving error correction.","PeriodicalId":134522,"journal":{"name":"IEEE Transactions on Communication Technology","volume":"6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1968-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115078383","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
COMET - A New Meteor-Burst System Incorporating ARQ and Diversity Reception 彗星-一种结合ARQ和分集接收的流星暴系统
IEEE Transactions on Communication Technology Pub Date : 1968-04-01 DOI: 10.1109/TCOM.1968.1089833
P. Bartholomé, I. Vogt
{"title":"COMET - A New Meteor-Burst System Incorporating ARQ and Diversity Reception","authors":"P. Bartholomé, I. Vogt","doi":"10.1109/TCOM.1968.1089833","DOIUrl":"https://doi.org/10.1109/TCOM.1968.1089833","url":null,"abstract":"A system has been built to make efficient use of meteor-trail reflections for telegraph communications in the VHF band over distances up to 2000 kin. The information is transmitted over the circuit in both directions at an instantaneous rate of 2000 bauds whenever a radio path is established by reflection from a meteor trail. The control of the flow of information is not based on an assessment of the signal strength, as for instance in the JANET system, but on an error-detection scheme with automatic request (ARQ). This technique makes it possible to minimize starting delays and to carry on transmission until the end of the signal burst independently of the rate of decay. A special synchronization procedure has been developed to enable the system to cope with path length variations up to one character in length. The system also features frequency, space, and height diversity. For more than a year extensive measurements were carried out on a 1000-km path at frequencies in the 36- to 39-MHz band. The transmitter power was 200 watts and the antennas were five-element Yagis. Hourly average values of the traffic capacity were found to vary between four to eight 50-baud channels in the early morning and between one half to two channels in the late afternoon with the average over 24 hours approximately three channels. The error rate was less than one in 3000 characters for 90 percent of the time. Statistical data concerning bursts, interval between bursts, and delays in the transmission of messages are presented.","PeriodicalId":134522,"journal":{"name":"IEEE Transactions on Communication Technology","volume":"42 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1968-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114857280","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: 47
Analysis of a Hybrid Frequency - Time Hopping Random-Access Satellite Communication System 一种混合跳频随机接入卫星通信系统的分析
IEEE Transactions on Communication Technology Pub Date : 1968-04-01 DOI: 10.1109/TCOM.1968.1089840
J. Wittman
{"title":"Analysis of a Hybrid Frequency - Time Hopping Random-Access Satellite Communication System","authors":"J. Wittman","doi":"10.1109/TCOM.1968.1089840","DOIUrl":"https://doi.org/10.1109/TCOM.1968.1089840","url":null,"abstract":"This paper analyzes the multiple-access performance of a satellite communications network, in which each subscriber employs a hybrid frequency-time hopping random-access technique for the transmittal of binary information by means of a linear average power limited satellite repeater. The information is repetitively encoded into a number of binary chips. Individual mark and space chips are matched filter envelope detected and pairwise compared; the final binary decision is based upon a majority vote. The present analysis extends previous results by simultaneously taking into account RF phase cancellation effects at the satellite as well as up- and down-link noise. Some numerical results are presented using system parameters typical of a small subscriber net. The multiple-access performance of the frequency-time hopping system is (for the assumed parameters and a bit error rate of 10-5) found to be about 6.6 dB poorer than that of a comparable orthogonal multiple-access system.","PeriodicalId":134522,"journal":{"name":"IEEE Transactions on Communication Technology","volume":"17 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1968-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121282064","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: 4
Intermodulation Distortion in Freqency-Division-Multiplex FM Systems - A Tutorial Summary 频分多路调频系统中的互调失真-教程摘要
IEEE Transactions on Communication Technology Pub Date : 1968-04-01 DOI: 10.1109/TCOM.1968.1089831
G. Garrison
{"title":"Intermodulation Distortion in Freqency-Division-Multiplex FM Systems - A Tutorial Summary","authors":"G. Garrison","doi":"10.1109/TCOM.1968.1089831","DOIUrl":"https://doi.org/10.1109/TCOM.1968.1089831","url":null,"abstract":"In the design of FDM-FM communication systems, a great deal of importance is attached to an appreciation of those transmission irregularities that yield second- and third-order intermodulation spectra. Such spectra are readily generated by amplitude, phase, and AM/PM conversion anomalies within the FM transmission path. In this paper the results of the available journal literature have been reworked for presentation in a generalized form appropriate for use by equipment designers and system analysts. Intermodulation noise magnitudes and spectral distributions are expressed in terms of the transmission network and system modulation parameters with the AM/PM conversion characteristic extended to that of a second-order power series in radian frequency. To fully exploit the usefulness of the foregoing, the coherency between the intermodulation spectra of all distortion mechanisms is considered. The effects of this correlation is then exemplified for a tandemly interconnected set of distorters. It is found that all secondand third-order distortion mechanisms may be grouped under the classifications of: amplitude, delay, equivalent amplitude/delay, and quasi-equivalent amplitude/delay distortion. It is concluded that, as a result of the correlative structure of the distortion processes, an overall system measurement of intermodulation noise may exhibit an unexpected level of magnitude and/or have a spectral distribution significantly different from any of the inherent system distortions.","PeriodicalId":134522,"journal":{"name":"IEEE Transactions on Communication Technology","volume":"438 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1968-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114955968","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: 20
Electronic Reliability in the Field 现场电子可靠性
IEEE Transactions on Communication Technology Pub Date : 1967-12-01 DOI: 10.1109/TCOM.1967.1089669
J. Lawrence, T. Urben
{"title":"Electronic Reliability in the Field","authors":"J. Lawrence, T. Urben","doi":"10.1109/TCOM.1967.1089669","DOIUrl":"https://doi.org/10.1109/TCOM.1967.1089669","url":null,"abstract":"Over nearly a decade the British Post Office has been operating normal production electronic equipment for the control and routing of calls through the long distance switching network. More recently the first normal production installation of a fully electronically controlled exchange has been cut into service and is the beginning of a regular program for the installation of such exchanges throughout Britain. It is appropriate at this time to review the performance record of the various types of electronic switching equipment, first to confirm that the direction of development is leading toward greater reliability in service, and second to determine whether changes in maintenance organization may be necessary to take advantage of the greater penetration of the more reliable electronic equipment. This paper deals mainly with the lessons to be learned from the performance of the various types of register-transistor equipment used in the long-distance switching network, but also gives some reference to the performance of the TXE 2 electronic exchange.","PeriodicalId":134522,"journal":{"name":"IEEE Transactions on Communication Technology","volume":"53 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1967-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126496567","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
Field experience with quasi-electronic telephone switching systems 具有准电子电话交换系统的现场经验
IEEE Transactions on Communication Technology Pub Date : 1967-12-01 DOI: 10.1109/TCOM.1967.1089675
H. Willrett
{"title":"Field experience with quasi-electronic telephone switching systems","authors":"H. Willrett","doi":"10.1109/TCOM.1967.1089675","DOIUrl":"https://doi.org/10.1109/TCOM.1967.1089675","url":null,"abstract":"The combination of electronic components and dryreed contacts for use in switching systems has proved its high reliability standard. For several years, various types of equipment, e. g., routing translators, switching arrangements for direct distance dialing plant and local telephone offices have been in continuous operation in the public network. Component reliability figures, gained from these devices, are given.","PeriodicalId":134522,"journal":{"name":"IEEE Transactions on Communication Technology","volume":"312 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1967-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115905181","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: 1
Design Concepts for Transportable Ionoscatter Systems and Experimental Results 可转移离子散射系统的设计概念和实验结果
IEEE Transactions on Communication Technology Pub Date : 1967-12-01 DOI: 10.1109/TCOM.1967.1089679
P. Bartholomé, I. Vogt
{"title":"Design Concepts for Transportable Ionoscatter Systems and Experimental Results","authors":"P. Bartholomé, I. Vogt","doi":"10.1109/TCOM.1967.1089679","DOIUrl":"https://doi.org/10.1109/TCOM.1967.1089679","url":null,"abstract":"An experimental ionoscatter system carrying four 50-baud telegraph circuits has been designed and tested at 36 MHz over a distance of 1000 km between the Netherlands and Southern France. The object was to demonstrate the possibility of designing a system sufficiently compact to be made transportable. By using multiple-diversity reception and automatic request (ARQ) equipment, it has been possible to achieve a reliability of 99.9 percent with simple Yagi antennas and a transmitter power of 5 kW. The performance limits were an error rate of 1 to 3000 characters and a speed reduction of 10 percent. Frequency, horizontalspace, and vertical-space diversity reception have been tried. Signal strength measurements have also been made over paths shorter than 1000 km. It is shown that for a system with low-gain antennas the propagation loss at 400 km is 6 dB greater than at 1000 km. The use of error-correction codes is suggested for one-way connections where the ARQ technique is not applicable. It is shown that it is possible to obtain the same performance as with ARQ.","PeriodicalId":134522,"journal":{"name":"IEEE Transactions on Communication Technology","volume":"20 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1967-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127614612","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
Partitioned Switching Arrays 分区交换阵列
IEEE Transactions on Communication Technology Pub Date : 1967-12-01 DOI: 10.1109/TCOM.1967.1089672
R. Banks, D. Mandelbaum
{"title":"Partitioned Switching Arrays","authors":"R. Banks, D. Mandelbaum","doi":"10.1109/TCOM.1967.1089672","DOIUrl":"https://doi.org/10.1109/TCOM.1967.1089672","url":null,"abstract":"Known switching arrays service subscribers in either a blocking or a totally nonblocking manner. The first part of this paper describes a method of modifying totally nonblocking arrays to service a group of subscribers, some of which will be given nonblocking service while the rest will be given service at a prescribed blocking probability. It is shown that the resultant crosspoint saving compared with the totally nonblocking case is significant when the subgroup receiving nonblocking service is limited. The method used is illustrated for 3- and 5-stage symmetrical arrays and may be extended to arrays having a greater number of stages. It is then demonstrated how any number of subscriber groups can be serviced with different specified blocking probabilities by such arrays, which are called partitioned switching arrays. An example is included for a partitioned array affording three grades of service.","PeriodicalId":134522,"journal":{"name":"IEEE Transactions on Communication Technology","volume":"83 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1967-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121611280","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
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