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An Approach to High-Order Cumulants Used to Detect Multifrequency Signalsin Telephone Networks
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作者 LIU Ying1, HU Ke-gang1, WANG Shu-xun2 (1 Department of Telecommunication Engineering, Changchun Institute of Posts and Telecommunications, Changchun 130012, P.R.China 2 College of Information Science and Engineering, Jilin University of Technology, Cha 《The Journal of China Universities of Posts and Telecommunications》 EI CSCD 2000年第1期94-98,共5页
In accordance with the detecting process of multi-frequency signals between the offices in telephone networks, and in contrast with the autocorrelation method used to handle the multi-frequency signals, a fast, inexpe... In accordance with the detecting process of multi-frequency signals between the offices in telephone networks, and in contrast with the autocorrelation method used to handle the multi-frequency signals, a fast, inexpensive and unbiased of cumulants estimation method is adopted in detecting signals. This detecting method is better for resisting noise performance and more practical than the autocorrelation method. 展开更多
关键词 telephone networks multi-frequency signals AUTOCORRELATION CUMULANTS
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Analysis of Call Drop Problem for Remote Access Server on Server Side
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作者 ZHOU Wei, LIU Hong School of Communication and Information Engineering, Shanghai University Shanghai 200072, China 《Advances in Manufacturing》 SCIE CAS 2000年第S1期58-61,共4页
Call drop is one of the most common problems encountered by ISP with PSTN access. In this pacer several reasons on server side that cause modem disconnection are analyzed. In the last part of this paper, some solution... Call drop is one of the most common problems encountered by ISP with PSTN access. In this pacer several reasons on server side that cause modem disconnection are analyzed. In the last part of this paper, some solutions are Put forward to reduce call drop rate. 展开更多
关键词 remote access server ISP(internet service provider) PSTN(public switched telephone network)
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ROBO-SPOT:Detecting Robocalls by Understanding User Engagement and Connectivity Graph
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作者 Muhammad Ajmal Azad Junaid Arshad Farhan Riaz 《Big Data Mining and Analytics》 EI CSCD 2024年第2期340-356,共17页
Robo or unsolicited calls have become a persistent issue in telecommunication networks,posing significant challenges to individuals,businesses,and regulatory authorities.These calls not only trick users into disclosin... Robo or unsolicited calls have become a persistent issue in telecommunication networks,posing significant challenges to individuals,businesses,and regulatory authorities.These calls not only trick users into disclosing their private and financial information,but also affect their productivity through unwanted phone ringing.A proactive approach to identify and block such unsolicited calls is essential to protect users and service providers from potential harm.Therein,this paper proposes a solution to identify robo-callers in the telephony network utilising a set of novel features to evaluate the trustworthiness of callers in a network.The trust score of the callers is then used along with machine learning models to classify them as legitimate or robo-caller.We use a large anonymized dataset(call detailed records)from a large telecommunication provider containing more than 1 billion records collected over 10 days.We have conducted extensive evaluation demonstrating that the proposed approach achieves high accuracy and detection rate whilst minimizing the error rate.Specifically,the proposed features when used collectively achieve a true-positive rate of around 97%with a false-positive rate of less than 0.01%. 展开更多
关键词 social network analysis REPUTATION unwanted calls robo-callers telephone network Spam Over Internet Technology(SPIT)
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The Application of Grey Prediction toCommunication Network Planning
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作者 XieShichang(Department of Management of Changchun Post andTelecornmunication institute Changchun 130012, P. R. China) 《The Journal of China Universities of Posts and Telecommunications》 EI CSCD 1994年第2期71-76,共6页
The first and foremost task of communication network planning is macro forecasting to theservice volume ,and the quality of planning ultimately depends upon the accuracy of forecasting. Theconventional methods usuall... The first and foremost task of communication network planning is macro forecasting to theservice volume ,and the quality of planning ultimately depends upon the accuracy of forecasting. Theconventional methods usually as forecasting model are increase rate method, time sequence extensionmethod, regression correlation analysis method. However, nowadays in market economy drvelopingstage ,to meet the vigorous demand, communication servtice business, particularly the telecommunicationservice is drveloping rapidly such that forcasting by the conventional method fails achieve the goalfavourably. Thus we should emancipate our mind thinking deeply into the communication conoiationand the method of forecasting. To this end ,the author exploited the laiter ,introducing GM(1, 1) modelas forcastzng means. Comparint with the forecasting results from several other niodels the GM(1.1)has better reliability. Is has been put into practice in many urban telecomrnunication network planning. Allresults obtatned are desirable. 展开更多
关键词 grey system theory forecasting civil telephone network planning
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Traffic Source Characterization:Considering Real Demands of Communication Attempts 被引量:1
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作者 CaiBin ZhengHuisong AND WangLiangyuan(Department ,of Managetnent Engineeriny, Nanjing University of Posts and TelecommunicationsNanjing, 210003, P. R. China) 《The Journal of China Universities of Posts and Telecommunications》 EI CSCD 1994年第2期68-70,共3页
in order to project a reliable telecommunication network ,we have to measure the call lossrate of present traffic and to predzct the traffic of hajective network. In this paper we point out that afactor of real commun... in order to project a reliable telecommunication network ,we have to measure the call lossrate of present traffic and to predzct the traffic of hajective network. In this paper we point out that afactor of real communication needs for subscrihas should be added in studying the traffic source char-acterization. Generally, the predicted traffic does not equal to the real demends, Considered asubscriber's psychological facter for attempts in busy-hour, a mathematical medel of probable dertva-tive calls from each real communication demand is given,with which the calling-up probabity, andthe repeating attempt probability of original subscribers on line occupation are calculated and the rela-tionship between the traffic and the real cammunication need is predicted. 展开更多
关键词 traffic source characterzzation relzable telecommunication networks. telephone traffic realcommunication demands service quality control
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